Document:

Trust Indenture

 EXHIBIT 4.1 
  

TRUST INDENTURE 
  
 Dated as of the 12th day of November, 2004 
  
 BETWEEN 
  
 GASTAR EXPLORATION LTD. 
  
 and 
  
 CIBC MELLON TRUST
COMPANY 
  
 Providing for the issue of Debentures

 TABLE OF CONTENTS 
  

					
	 	  	 	  	Page

	TABLE OF CONTENTS	  	i
	ARTICLE 1 INTERPRETATION	  	1
	1.1	  	Definitions	  	1
	1.2	  	Meaning of “Outstanding”	  	6
	1.3	  	Interpretation	  	6
	1.4	  	Headings Etc.	  	6
	1.5	  	Day not a Business Day	  	7
	1.6	  	Applicable Law	  	7
	1.7	  	Monetary References	  	7
	1.8	  	U.S. Currency Equivalents	  	7
	1.9	  	Invalidity, Etc.	  	7
	1.10	  	Language	  	7
	1.11	  	Successors and Assigns	  	7
	1.12	  	Benefits of Indenture	  	7
	ARTICLE 2 THE DEBENTURES	  	8
	2.1	  	Limit of Debentures	  	8
	2.2	  	Terms of Debentures of any Series	  	8
	2.3	  	Form of Debentures	  	9
	2.4	  	Form and Terms of Initial Debentures	  	9
	2.5	  	Certification and Delivery of Additional Debentures	  	13
	2.6	  	Issue of Global Debentures	  	14
	2.7	  	Execution of Debentures	  	15
	2.8	  	Certification	  	15
	2.9	  	Interim Debentures or Certificates	  	15
	2.10	  	Mutilation, Loss, Theft or Destruction	  	16
	2.11	  	Concerning Interest	  	16
	2.12	  	Debentures to Rank Pari Passu	  	16
	2.13	  	Payments of Amounts Due on Maturity	  	16
	2.14	  	Resale Restrictions and Legends	  	17
	2.15	  	Payment of Interest	  	19
	ARTICLE 3 REGISTRATION, TRANSFER, EXCHANGE AND OWNERSHIP	  	20
	3.1	  	Global Debentures	  	20
	3.2	  	Fully Registered Debentures	  	21
	3.3	  	Transferee Entitled to Registration	  	21
	3.4	  	No Notice of Trusts	  	22
	3.5	  	Registers Open for Inspection	  	22
	3.6	  	Exchanges of Debentures	  	22
	3.7	  	Closing of Registers	  	22
	3.8	  	Charges for Registration, Transfer and Exchange	  	23
	3.9	  	Ownership of Debentures	  	23
	ARTICLE 4 REDEMPTION AND PURCHASE OF DEBENTURES	  	23
	4.1	  	Applicability of Article	  	23
	4.2	  	Partial Redemption	  	24
	4.3	  	Notice of Redemption	  	24
	4.4	  	Debentures Due on Redemption Dates	  	25
	4.5	  	Deposit of Redemption Monies	  	25
	4.6	  	Failure to Surrender Debentures Called for Redemption	  	25
	4.7	  	Cancellation of Debentures Redeemed	  	26
	4.8	  	Purchase of Debentures by the Corporation	  	26

					
	ARTICLE 5 SUBORDINATION OF DEBENTURES	  	26
	5.1	  	Applicability of Article	  	26
	5.2	  	Order of Payment	  	26
	5.3	  	Subrogation to Rights of Holders of Senior Indebtedness	  	27
	5.4	  	Obligation to Pay Not Impaired	  	28
	5.5	  	No Payment if Senior Indebtedness in Default	  	28
	5.6	  	Payment on Debentures Permitted	  	28
	5.7	  	Confirmation of Subordination	  	29
	5.8	  	Knowledge of Debenture Trustee	  	29
	5.9	  	Debenture Trustee May Hold Senior Indebtedness	  	29
	5.10	  	Rights of Holders of Senior Indebtedness Not Impaired	  	29
	5.11	  	Altering the Senior Indebtedness	  	29
	5.12	  	Additional Indebtedness	  	29
	5.13	  	Right of Debentureholder to Convert Not Impaired	  	29
	5.14	  	Invalidated Payments	  	30
	5.15	  	Contesting Security	  	30
	ARTICLE 6 CONVERSION OF DEBENTURES	  	30
	6.1	  	Applicability of Article	  	30
	6.2	  	Notice of Expiry of Conversion Privilege	  	30
	6.3	  	Revival of Right to Convert	  	30
	6.4	  	Manner of Exercise of Right to Convert	  	30
	6.5	  	Adjustment of Conversion Price	  	32
	6.6	  	No Requirement to Issue Fractional Common Shares	  	34
	6.7	  	Corporation to Reserve Common Shares	  	35
	6.8	  	Cancellation of Converted Debentures	  	35
	6.9	  	Certificate as to Adjustment	  	35
	6.10	  	Notice of Special Matters	  	35
	6.11	  	Protection of Debenture Trustee	  	35
	6.12	  	Legend on Common Shares	  	36
	ARTICLE 7 COVENANTS OF THE CORPORATION	  	36
	7.1	  	To Pay Principal and Interest	  	36
	7.2	  	To Pay Debenture Trustee’s Remuneration	  	36
	7.3	  	To Give Notice of Default	  	36
	7.4	  	Preservation of Existence, Status, etc.	  	37
	7.5	  	Keeping of Books	  	37
	7.6	  	Reporting Requirements	  	37
	7.7	  	No Distributions on Common Shares if Event of Default	  	37
	7.8	  	Performance of Covenants by Debenture Trustee	  	37
	ARTICLE 8 DEFAULT	  	37
	8.1	  	Events of Default	  	37
	8.2	  	Notice of Events of Default	  	39
	8.3	  	Waiver of Default	  	39
	8.4	  	Enforcement by the Debenture Trustee	  	39
	8.5	  	No Suits by Debentureholders	  	40
	8.6	  	Application of Monies by Debenture Trustee	  	41
	8.7	  	Notice of Payment by Debenture Trustee	  	41
	8.8	  	Debenture Trustee May Demand Production of Debentures	  	42
	8.9	  	Remedies Cumulative	  	42
	8.10	  	Judgment Against the Corporation	  	42
	8.11	  	Immunity of Debenture Trustee and Others	  	42
	ARTICLE 9 SATISFACTION AND DISCHARGE	  	42
	9.1	  	Cancellation and Destruction	  	42
	9.2	  	Non-Presentation of Debentures	  	42
	9.3	  	Repayment of Unclaimed Monies	  	43
	9.4	  	Discharge	  	43
	9.5	  	Satisfaction	  	43
	9.6	  	Continuance of Rights, Duties and Obligations	  	44

  

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	ARTICLE 10 SUCCESSORS	  	45
	10.1	  	Restrictions on Amalgamation, Merger and Sale of Certain Assets, etc.	  	45
	10.2	  	Vesting of Powers in Successor	  	45
	ARTICLE 11 COMPULSORY ACQUISITION	  	45
	11.1	  	Definitions	  	45
	11.2	  	Offer for Debentures	  	46
	11.3	  	Offeror’s Notice to Dissenting Shareholders	  	46
	11.4	  	Delivery of Debenture Certificates	  	46
	11.5	  	Payment of Consideration to Debenture Trustee	  	47
	11.6	  	Consideration to be held in Trust	  	47
	11.7	  	Completion of Transfer of Debentures to Offeror	  	47
	11.8	  	Communication of Offer to Corporation	  	47
	ARTICLE 12 MEETINGS OF DEBENTUREHOLDERS	  	48
	12.1	  	Right to Convene Meeting	  	48
	12.2	  	Notice of Meetings	  	48
	12.3	  	Chairman	  	49
	12.4	  	Quorum	  	49
	12.5	  	Power to Adjourn	  	49
	12.6	  	Show of Hands	  	50
	12.7	  	Poll	  	50
	12.8	  	Voting	  	50
	12.9	  	Proxies	  	50
	12.10	  	Persons Entitled to Attend Meetings	  	51
	12.11	  	Powers Exercisable by Extraordinary Resolution	  	51
	12.12	  	Meaning of “Extraordinary Resolution”	  	53
	12.13	  	Powers Cumulative	  	53
	12.14	  	Minutes	  	53
	12.15	  	Instruments in Writing	  	54
	12.16	  	Binding Effect of Resolutions	  	54
	12.17	  	Evidence of Rights Of Debentureholders	  	54
	12.18	  	Concerning Serial Meetings	  	54
	ARTICLE 13 NOTICES	  	54
	13.1	  	Notice to Corporation	  	54
	13.2	  	Notice to Debentureholders	  	55
	13.3	  	Notice to Debenture Trustee	  	55
	13.4	  	Mail Service Interruption	  	55
	ARTICLE 14 CONCERNING THE DEBENTURE TRUSTEE	  	55
	14.1	  	No Conflict of Interest	  	55
	14.2	  	Replacement of Debenture Trustee	  	56
	14.3	  	Duties of Debenture Trustee	  	56
	14.4	  	Reliance Upon Declarations, Opinions, etc.	  	56
	14.5	  	Evidence and Authority to Debenture Trustee, Opinions, etc.	  	57
	14.6	  	Officer’s Certificates Evidence	  	58
	14.7	  	Experts, Advisers and Agents	  	58
	14.8	  	Debenture Trustee May Deal in Debentures	  	58
	14.9	  	Investment of Monies Held by Debenture Trustee	  	58
	14.10	  	Debenture Trustee Not Ordinarily Bound	  	59
	14.11	  	Debenture Trustee Not Required to Give Security	  	59
	14.12	  	Debenture Trustee Not Bound to Act on Corporation’s Request	  	59
	14.13	  	Conditions Precedent to Debenture Trustee’s Obligations to Act Hereunder	  	59
	14.14	  	Authority to Carry on Business	  	59
	14.15	  	Compensation and Indemnity	  	60
	14.16	  	Acceptance of Trust	  	60
	ARTICLE 15 SUPPLEMENTAL INDENTURES	  	61
	15.1	  	Supplemental Indentures	  	61
	ARTICLE 16 EXECUTION AND FORMAL DATE	  	62
	16.1	  	Execution	  	62
	16.2	  	Formal Date	  	62
	16.3	  	Counterparts	  	62

  

 iii 

 THIS INDENTURE made as of the 12th day of November, 2004. 
  
 BETWEEN: 
  
 GASTAR EXPLORATION LTD., a corporation existing under the laws of the Province of Alberta and having its principal
office in the City of Mt. Pleasant, in the State of Michigan (hereinafter called the “Corporation”) 
  
 AND 
  
 CIBC MELLON TRUST COMPANY, a trust company existing under the laws of Canada having an office in the City of Calgary, in the Province of Alberta (hereinafter called the “Debenture Trustee”), on
its own right and on behalf of the Debentureholders 
  
 WITNESSETH THAT:

  
 WHEREAS the Corporation proposes to create and issue the
Debentures (defined herein) to be created and issued in the manner hereinafter appearing; 
  
 AND WHEREAS the Corporation, under the laws relating thereto, is duly authorized to create and issue the Debentures to be issued as herein provided; 
  
 AND WHEREAS, when certified by the Debenture Trustee and issued as in this Indenture provided, all necessary steps in
relation to the Corporation have been duly enacted, passed and/or confirmed and other proceedings taken and conditions complied with to make the creation and issue of the Debentures proposed to be issued hereunder legal, valid and binding on the
Corporation in accordance with the laws relating to the Corporation; 
  
 AND WHEREAS the foregoing recitals are made as representations and statements of fact by the Corporation and not by the Debenture Trustee; 
  
 NOW THEREFORE it is hereby covenanted, agreed and declared as follows: 
  
 ARTICLE 1 
 INTERPRETATION 
  

	1.1	Definitions 

  
 In this Indenture and in the Debentures, unless there is something in the subject matter or context inconsistent therewith, the expressions following
shall have the following meanings, namely: 
  

	(a)	“this Indenture”, “this Trust Indenture”, “hereto”, “herein”, “hereby”,
“hereunder”, “hereof” and similar expressions refer to this Indenture and not to any particular Article, Section, subsection, clause, subdivision or other portion hereof and include any and every instrument
supplemental or ancillary hereto; 

  

	(b)	“Additional Debentures” means Debentures of any one or more series, other than the first series of Debentures being the Initial Debentures, issued under this
Indenture; 

  

	(c)	“Applicable Securities Legislation” means applicable securities laws in each of the Provinces of Canada and the United States and each of its states;

  

	(d)	“Beneficial Holder” means any person who holds a beneficial interest in a Global Debenture as shown on the books of the Depository or a Depository Participant;

	(e)	“Business Day” means any day other than a Saturday, Sunday or any other day that the Debenture Trustee in Calgary, Alberta is not generally open for business;

  

	(f)	“Canadian Legend” has the meaning attributed thereto in Section 2.14(b); 

  

	(g)	“Change of Control” means the acquisition by any Person, or group of Persons acting jointly or in concert under an express voting trust or agreement, of voting
control or direction of Common Shares, or securities convertible into or carrying the right to acquire Common Shares, representing an aggregate of 66 2/3% or more of the outstanding Common Shares; 

  

	(h)	“Common Shares” means common shares of the Corporation, as such common shares are constituted on the date of execution and delivery of this Indenture; provided that
in the event of a change or a subdivision, revision, reduction, combination or consolidation thereof, any reclassification, capital reorganization, consolidation, amalgamation, arrangement, merger, sale or conveyance or liquidation, dissolution or
winding-up, or such successive changes, subdivisions, redivisions, reductions, combinations or consolidations, reclassifications, capital reorganizations, consolidations, amalgamations, arrangements, mergers, sales or conveyances or liquidations,
dissolutions or windings-up, then, subject to adjustments, if any, having been made in accordance with the provisions of Section 6.5, “Common Shares” shall mean the common shares or other securities or property resulting from such change,
subdivision, redivision, reduction, combination or consolidation, reclassification, capital reorganization, consolidation, amalgamation, arrangement, merger, sale or conveyance or liquidation, dissolution or winding-up; 

  

	(i)	“Conversion Price” means the US dollar amount for which each Common Share may be issued from time to time upon the conversion of Debentures or any series of
Debentures which are by their terms convertible in accordance with the provisions of Article 6; 

  

	(j)	“Corporation” means Gastar Exploration Ltd., an Alberta corporation, and includes any successor to or of the Corporation which shall have complied with the
provisions of Article 10; 

  

	(k)	“Corporation’s Auditors” or “Auditors of the Corporation” means an independent firm of chartered accountants duly appointed as auditors of the
Corporation; 

  

	(l)	“Counsel” means a barrister or solicitor or firm of barristers or solicitors (whether qualified to practice law in Canada, the United States, or elsewhere)
acceptable to the Debenture Trustee; 

  

	(m)	“Current Market Price” means the weighted average price per Common Shares for 20 trading days in any consecutive 30 day period ending on the fifth trading day
preceding the date of determination on the Toronto Stock Exchange (or, if the Common Shares are not listed thereon, on such stock exchange on which the Common Shares are listed as may be selected for such purpose by the Corporation, or if the Common
Shares are not listed on any stock exchange, then on the over-the-counter market). The weighted average price shall be determined by dividing the aggregate sale price of all Common Shares sold on the said exchange or market, as the case may be,
during the said 20 trading days selected by the Corporation in such consecutive 30 day period by the total number of Common Shares so sold; 

  

	(n)	“Debentureholders” or “holders” means the Persons for the time being entered in the register for Debentures as registered holders of Debentures
payable to a named payee or any transferees of such Persons by endorsement or delivery; 

  

	(o)	“Debentures” means the debentures, notes or other evidence of indebtedness of the Corporation issued and certified hereunder, or deemed to be issued and certified
hereunder, including, without limitation, the Initial Debentures, and for the time being outstanding, whether in definitive or interim form; 

  

	(p)	 “Depository” means, with respect to the Debentures of any series issuable or issued in the form of one or more Global Debentures, the person
designated as depository by the Corporation pursuant to Section 3.2 until a successor depository shall have become such pursuant to the applicable provisions of this Indenture, 

  

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and thereafter “Depository” shall mean each person who is then a depository hereunder, and if at any time there is more than one such person,
“Depository” as used with respect to the Debentures of any series shall mean each depository with respect to the Global Debentures of such series; 

  

	(q)	“Depository Participant” means a broker, dealer, bank, other financial institution or other person for whom from time to time, a Depository effects book entry for a
Global Debenture deposited with the Depository; 

  

	(r)	“dividends or distributions paid in the ordinary course” means any dividends paid on the Common Shares of the Corporation, whether in (1) cash, (2) shares of the
Corporation, (3) rights, options or warrants to purchase any shares, property or other assets of the Corporation (but excluding rights, options or warrants referred to in subsection 6.5(b) or 6.5(c)(ii)), in each case to the extent that the amount
or value of any such dividend at the time such dividend is declared, does not, when aggregated with the amount or value of such dividends declared on the Common Shares of the Corporation within the twelve months immediately prior to such
declaration, exceed 5% of the Current Market Price on the date that such dividend is declared payable by the Corporation on the Common Shares; and for the purpose of the foregoing where any dividend is declared payable, otherwise than in cash, any
securities, property or other assets so distributed by way of dividend shall be valued at the fair market value of such securities, property or other assets, as the case may be, as determined by the Directors in good faith, which determination shall
be conclusive; 

  

	(s)	“Event of Default” has the meaning ascribed thereto in Section 8.1; 

  

	(t)	“Extraordinary Resolution” has the meaning ascribed thereto in Section 12.12; 

  

	(u)	“Fully Registered Debentures” means Debentures registered as to both principal and interest; 

  

	(v)	“generally accepted accounting principles” means generally accepted accounting principles from time to time approved by the Canadian Institute of Chartered
Accountants, or if the Corporation issues its financial statements solely in accordance with generally accepted accounting principles in the United States, such generally accepted accounting principles as are from time to time in effect in the
United States; 

  

	(w)	“Global Debenture” means a Debenture that is issued to and registered in the name of the Depository, or its nominee, pursuant to Section 2.6 for purposes of being
held by or on behalf of the Depository as custodian for participants in the Depository’s book-entry only registration system; 

  

	(x)	“Government Obligations” means securities issued or guaranteed by the Government of Canada or any province thereof; 

  

	(y)	“Initial Debentures” means the Debentures designated as “9.75% Convertible Senior Unsecured Subordinated Debentures” and described in Section 2.4;

  

	(z)	“Interest Obligation” means the obligation of the Corporation to pay interest on the Debentures, as and when the same becomes due; 

  

	(aa)	“Interest Payment Date” means a date specified in a Debenture as the date on which an instalment of interest on such Debenture shall become due and payable;

  

	(bb)	“Legended Debentures” means Debentures bearing the US Legend or the Canadian Legend provided for in Section 2.14; 

  

	(cc)	 “Liquidity Event” means the occurrence of either of the foregoing: (i) the Registration Statement is declared effective by the United States
Securities and Exchange Commission; or (ii) a Written Direction of the Corporation and opinion of Counsel contemplated in the first proviso of Section 2.14(a) is delivered to the Debenture Trustee which cover resales of any outstanding Initial
Debentures and Common Shares 

  

 3 

	 	 
issuable upon conversion of such Initial Debentures that are held by persons who are not affiliates of the Corporation within the meaning of the 1933 Act;

  

	(dd)	“Maturity Account” means an account or accounts required to be established by the Corporation (and which shall be maintained by and subject to the control of the
Debenture Trustee) for each series of Debentures pursuant to and in accordance with this Indenture; 

  

	(ee)	“Maturity Date” means the date on which the Initial Debentures mature, or the date on which the Additional Debentures mature, as the case may be;

  

	(ff)	“Officer’s Certificate” means a certificate of the Corporation signed by any one authorized officer or director of the Corporation, on behalf of the
Corporation, in his or her capacity as an officer or director of the Corporation, as the case may be, and not in his or her personal capacity; 

  

	(gg)	“Periodic Offering” means an offering of Debentures of a series from time to time, the specific terms of which Debentures, including, without limitation, the rate
or rates of interest, if any, thereon, the stated maturity or maturities thereof and the redemption provisions, if any, with respect thereto, are to be determined by the Corporation upon the issuance of such Debentures from time to time;

  

	(hh)	“Person” includes an individual, corporation, company, partnership, joint venture, association, trust, trustee, unincorporated organization or government or any
agency or political subdivision thereof; 

  

	(ii)	“Prescribed Security” shall have the meaning attributed thereto from time to time pursuant to Regulation 6208 of the Income Tax Act (Canada) and
“Prescribed Securities” shall have a corresponding meaning; 

  

	(jj)	“Redemption Date” has the meaning attributed thereto in Section 4.3; 

  

	(kk)	“Redemption Notice” has the meaning attributed thereto in Section 4.3; 

  

	(ll)	“Redemption Price” means, in respect of a Debenture, the amount, excluding interest, payable on the Redemption Date fixed for such Debenture;

  

	(mm)	“Regulation S” means Regulation S adopted by the United States Securities and Exchange Commission under the 1933 Act; 

  

	(nn)	“Registration Statement” means a registration statement of the Corporation filed with the United States Securities and Exchange Commission (including the
prospectus, amendments and supplements to such registration statement, including post-effective amendments, all exhibits and all documents incorporated by reference or deemed to be incorporated by reference in such registration statement) that
registers the Common Shares issuable upon conversion of the Initial Debentures (other than those that have been previously sold in accordance with Rule 144 under the 1933 Act or are not otherwise restricted securities under the 1933 Act) for resale
on a continuous shelf basis by Debentureholders or Beneficial Holders who furnish selling securityholder information to the Corporation for timely inclusion in such registration statement; 

  

	(oo)	“Senior Creditor” means a holder or holders of Senior Indebtedness and includes any representative or representatives or trustee or trustees of any such holder or
holders; 

  

	(pp)	“Senior Indebtedness” means the principal of and the interest and premium (or any other amounts payable thereunder), if any, on: 

  

	 	(i)	 all indebtedness (including any indebtedness to trade creditors), liabilities and obligations of the Corporation (other than the Initial Debentures), whether
outstanding on the date of this Indenture or thereafter created, incurred, assumed or guaranteed in connection with the acquisition by the 

  

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Corporation of any businesses, properties or other assets or for monies borrowed or raised by whatever means (including, without limitation, by means of
commercial paper, bankers’ acceptances, letters of credit, debt instruments, bank debt and financial leases, and any liability evidenced by bonds, debentures, notes or similar instruments) or in connection with the acquisition of any
businesses, properties or other assets or for monies borrowed or raised by whatever means (including, without limitation, by means of commercial paper, bankers’ acceptances, letters of credit, debt instruments, bank debt and financial leases,
and any liability evidenced by bonds, debentures, notes or similar instruments) by others including, without limitation, any Subsidiary of the Corporation for payment of which the Corporation is responsible or liable, whether absolutely or
contingently; 

  

	 	(ii)	without limitation of subparagraph (i), all indebtedness created under the Note Purchase Agreement dated June 24, 2004 from First Texas Development, Inc. to the Purchasers listed on
Schedule A thereto, relating to US $15,000,000 principal amount 15% Senior Notes due July 1, 2009, as amended by Letter Agreement dated October 13, 2004, and all indebtedness created under the Note Purchase Agreement dated October 13, 2004 from
First Texas Development, Inc. to the Purchasers listed on Schedule A thereto, relating to US $10,000,000 principal amount 15% Senior Notes due October 12, 2007, including any additional indebtedness that may be issued in satisfaction of interest due
and payable thereon; and 

  

	 	(iii)	renewals, extensions, restructurings, refinancings and refundings of any such indebtedness, liabilities or obligations, 

  
 unless in each case it is provided by the terms of the instrument creating
or evidencing such indebtedness, liabilities or obligations that such indebtedness, liabilities or obligations are not superior in right of payment to Debentures which by their terms are subordinated, which for greater certainty includes the Initial
Debentures; 
  

	(qq)	“Senior Security” means all mortgages, liens, pledges, charges (whether fixed or floating), security interests or other encumbrances of any kind, contingent or
absolute, held by or on behalf of any Senior Creditor and in any manner securing any Senior Indebtedness; 

  

	(rr)	“Subsidiary” has the meaning ascribed thereto in the Securities Act (Alberta); 

  

	(ss)	“Tax Act” means the Income Tax Act (Canada) and the regulations thereunder, as amended; 

  

	(tt)	“Time of Expiry” means the time of expiry of certain rights with respect to the conversion of Debentures under Article 6 which is to be set forth for each series of
Debentures which by their terms are to be convertible; 

  

	(uu)	“trading day” means, with respect to the Toronto Stock Exchange or other market for securities, any day on which such exchange or market is open for trading or
quotation; 

  

	(vv)	“United States” means the United States of America, its territories and possessions, any state of the United States and the District of Columbia;

  

	(ww)	“U.S. Currency Equivalent” has the meaning attributed thereto in Section 1.8; 

  

	(xx)	“US Legend” has the meaning attributed thereto in Section 2.14(a); 

  

	(yy)	“Written Direction of the Corporation” means an instrument in writing signed by any one officer or director of the Corporation; and 

  

	(zz)	“1933 Act” means the United States Securities Act of 1933, as amended. 

  

 5 

	1.2	Meaning of “Outstanding” 

  
 Every Debenture certified and delivered by the Debenture Trustee hereunder shall be deemed to be outstanding until it is cancelled, converted or redeemed
or delivered to the Debenture Trustee for cancellation, conversion or redemption or monies for the payment thereof shall have been set aside under Section 9.2, provided that: 
  

	(a)	Debentures which have been partially redeemed, purchased or converted shall be deemed to be outstanding only to the extent of the unredeemed, unpurchased or unconverted part of the
principal amount thereof; 

  

	(b)	when a new Debenture has been issued in substitution for a Debenture which has been lost, stolen or destroyed, only one of such Debentures shall be counted for the purpose of
determining the aggregate principal amount of Debentures outstanding; and 

  

	(c)	for the purposes of any provision of this Indenture entitling holders of outstanding Debentures to vote, sign consents, requisitions or other instruments or take any other action
under this Indenture, or to constitute a quorum of any meeting of Debentureholders, Debentures owned directly or indirectly, legally or equitably, by the Corporation shall be disregarded except that: 

  

	 	(i)	for the purpose of determining whether the Debenture Trustee shall be protected in relying on any such vote, consent, acquisition or other instrument or action, or on the holders of
Debentures present or represented at any meeting of Debentureholders, only the Debentures which the Debenture Trustee knows are so owned shall be so disregarded; and 

  

	 	(ii)	Debentures so owned which have been pledged in good faith other than to the Corporation shall not be so disregarded if the pledgee shall establish to the satisfaction of the
Debenture Trustee the pledgee’s right to vote such Debentures, sign consents, requisitions or other instruments or take such other actions in his discretion free from the control of the Corporation or a Subsidiary of the Corporation.

  

	1.3	Interpretation 

  
 In this Indenture: 
  

	(a)	words importing the singular number or masculine gender shall include the plural number or the feminine or neuter genders, and vice versa; 

  

	(b)	all references to Articles and Schedules refer, unless otherwise specified, to articles of and schedules to this Indenture; 

  

	(c)	all references to Sections refer, unless otherwise specified, to sections, subsections or clauses of this Indenture; and 

  

	(d)	words and terms denoting inclusiveness (such as “include” or “includes” or “including”), whether or not so stated, are not limited by and do not imply
limitation of their context or the words or phrases which precede or succeed them. 

  

	1.4	Headings Etc. 

  
 The division of this Indenture into Articles and Sections, the provision of a Table of Contents and the insertion of headings are for convenience of
reference only and shall not affect the construction or interpretation of this Indenture or of the Debentures. 
  

 6 

	1.5	Day not a Business Day 

  
 In the event that any day on or before which any action required to be taken hereunder is not a Business Day, then such action shall be required to be
taken on or before the requisite time on the next succeeding day that is a Business Day. 
  

	1.6	Applicable Law 

  
 This Indenture and the Debentures shall be construed in accordance with the laws of the Province of Alberta and the laws of Canada applicable therein and
shall be treated in all respects as Alberta contracts. 
  

	1.7	Monetary References 

  
 Any reference in this Indenture to “US dollars” or the signs “US$” or “$” shall be deemed to be a
reference to lawful money of the United States, and any reference to “Canadian dollars” or the sign “C$” shall be deemed to be a reference to the lawful money of Canada. 
  

	1.8	U.S. Currency Equivalents 

  
 For purposes of applying any provision hereof, the “U.S. Currency Equivalent” of any amount which is expressed in a currency other than
US dollars shall be deemed as of any date to be equal to the amount in the lawful money of the United States which is required to purchase such amount (i) in Canadian dollars, based on the Official Spot Rate of Exchange quoted by the Bank of Canada
at 12:00 noon (New York time) on such date and (ii) otherwise, based upon the Federal Reserve Bank of New York’s 10:00 a.m. fixing of the rate of exchange applicable to the relevant currency, on such date. 
  

	1.9	Invalidity, Etc. 

  
 Any provision hereof which is prohibited or unenforceable shall be ineffective only to the extent of such prohibition or unenforceability, without
invalidating the remaining provisions hereof. 
  

	1.10	Language 

  
 Each of the parties hereto hereby acknowledges that it has consented to and requested that this Indenture and all documents relating thereto, including,
without limiting the generality of the foregoing, the form of Debenture attached hereto as Schedule A, be drawn up in the English language only. 
  

	1.11	Successors and Assigns 

  
 All covenants and agreements in this Indenture by the Corporation shall bind its successors and assigns, whether expressed or not. 
  

	1.12	Benefits of Indenture 

  
 Nothing in this Indenture or in the Debentures, express or implied, shall give to any Person, other than the parties hereto and their successors
hereunder, any paying agent, the holders of Debentures, the Debenture Trustee and (except to the extent provided in Sections 14.2 and 8.11) the holders of Common Shares, any benefit or any legal or equitable right, remedy or claim under this
Indenture. 
  

 7 

 ARTICLE 2 
 THE DEBENTURES 
  

	2.1	Limit of Debentures 

  
 The aggregate principal amount of Debentures authorized to be issued under this Indenture is unlimited, but Debentures may be issued only upon and subject
to the conditions and limitations herein set forth. 
  

	2.2	Terms of Debentures of any Series 

  
 The Debentures may be issued in one or more series. There shall be established herein or in or pursuant to one or more indentures supplemental hereto,
prior to the initial issuance of Debentures of any particular series: 
  

	(a)	the designation of the Debentures of the series (which need not include the term “Debentures”), which shall distinguish the Debentures of the series from the Debentures of
all other series; 

  

	(b)	any limit upon the aggregate principal amount of the Debentures of the series that may be certified and delivered under this Indenture (except for Debentures certified and delivered
upon registration of, transfer of, amendment of, or in exchange for, or in lieu of, other Debentures of the series pursuant to Sections 2.9, 2.10, 3.2, 3.3 and 3.6); 

  

	(c)	the date or dates on which the principal of the Debentures of the series is payable; 

  

	(d)	the rate or rates at which the Debentures of the series shall bear interest, if any, the date or dates from which such interest shall accrue, on which such interest shall be payable
and on which a record, if any, shall be taken for the determination of holders to whom such interest shall be payable and/or the method or methods by which such rate or rates or date or dates shall be determined; 

  

	(e)	the place or places where the principal of and any interest on Debentures of the series shall be payable or where any Debentures of the series may be surrendered for registration of
transfer or exchange; 

  

	(f)	the right, if any, of the Corporation to redeem Debentures of the series, in whole or in part, at its option and the period or periods within which, the price or prices at which and
any terms and conditions upon which, Debentures of the series may be so redeemed, pursuant to any sinking fund or otherwise; 

  

	(g)	the obligation, if any, of the Corporation to redeem, purchase or repay Debentures of the series pursuant to any mandatory redemption, sinking fund or analogous provisions or at the
option of a holder thereof and the price or prices at which, the period or periods within which, the date or dates on which, and any terms and conditions upon which, Debentures of the series shall be redeemed, purchased or repaid, in whole or in
part, pursuant to such obligations; 

  

	(h)	if other than denominations of US$1,000 and any integral multiple thereof, the denominations in which Debentures of the series shall be issuable; 

  

	(i)	subject to the provisions of this Indenture, any trustee, Depositories, authenticating or paying agents, transfer agents or registrars or any other agents with respect to the
Debentures of the series; 

  

	(j)	any other events of default or covenants with respect to the Debentures of the series; 

  

	(k)	whether and under what circumstances the Debentures of the series will be convertible into or exchangeable for securities of any Person; 

  

	(l)	the form and terms of the Debentures of the series; 

  

 8 

	(m)	if applicable, that the Debentures of the series shall be issuable in whole or in part as one or more Global Debentures and, in such case, the Depository or Depositories for such
Global Debentures in whose name the Global Debentures will be registered, and any circumstances other than or in addition to those set forth in Section 2.9 or 3.2 or those applicable with respect to any specific series of Debentures, as the case may
be, in which any such Global Debenture may be exchanged for Fully Registered Debentures, or transferred to and registered in the name of a person other than the Depository for such Global Debentures or a nominee thereof; 

  

	(n)	if other than United States currency, the currency in which the Debentures of the series are issuable; and 

  

	(o)	any other terms of the Debentures of the series (which terms shall not be inconsistent with the provisions of this Indenture). 

  
 All Debentures of any one series shall be substantially identical, except as
may otherwise be established herein or by or pursuant to a resolution of the directors of the Corporation, Officer’s Certificate or in an indenture supplemental hereto. All Debentures of any one series need not be issued at the same time and
may be issued from time to time, including pursuant to a Periodic Offering, consistent with the terms of this Indenture, if so provided herein, by or pursuant to such resolution of the directors of the Corporation, Officer’s Certificate or in
an indenture supplemental hereto. 
  

	2.3	Form of Debentures 

  
 Except in respect of the Initial Debentures, the form of which is provided for herein, the Debentures of each series shall be substantially in such form
or forms (not inconsistent with this Indenture) as shall be established herein or by or pursuant to one or more resolutions of the directors of the Corporation (as set forth in a resolution of the directors of the Corporation or to the extent
established pursuant to, rather than set forth in, a resolution of the directors of the Corporation, in an Officer’s Certificate detailing such establishment) or in one or more indentures supplemental hereto, in each case with such appropriate
insertions, omissions, substitutions and other variations as are required or permitted by this Indenture and may have imprinted or otherwise reproduced thereon such legend or legends or endorsements, not inconsistent with the provisions of this
Indenture, as may be required to comply with any law or with any rules or regulations pursuant thereto or with any rules or regulations of any securities exchange or securities regulatory authority or to conform to general usage, all as may be
determined by the director or officer of the Corporation executing such Debentures, as conclusively evidenced by his/her execution of such Debentures. The Debenture Trustee shall not be required to ensure compliance with any law or with any rules or
regulations pursuant thereto or with any rules or regulations of any securities exchange or securities regulatory authority or to conform to general usage in connection with the issue, transfer or exchange of the Debentures. The responsibility for
compliance with the foregoing shall be that of the Corporation or the holder, as applicable. 
  

	2.4	Form and Terms of Initial Debentures 

  

	(a)	The first series of Debentures (the “Initial Debentures”) authorized for issue immediately is limited to an aggregate principal amount of US$30,000,000, and shall
be designated as “9.75% Convertible Senior Unsecured Subordinated Debentures”. 

  

	(b)	The Initial Debentures shall be dated as of November 12, 2004 and shall bear interest from and including such date of issue at the rate of 9.75% per annum, payable quarterly on
February 12, May 12, August 12 and November 12 in each year, the first such payment to fall due on February 12, 2005, and provided that the last such payment (representing interest payable from the last Interest Payment Date to, but
excluding, the Maturity Date of the Initial Debentures) shall fall due on the Maturity Date of the Initial Debentures, payable after as well as before maturity and after as well as before default, with interest on amounts in default at the same
rate, compounded quarterly. For certainty, the first interest payment will include interest accrued from November 12, 2004 to, but excluding February 12, 2005, which will be equal to US$24.58 for each US$1,000 principal amount of the Initial
Debentures. The Initial Debentures will mature on November 20, 2009. 

  

 9 

	(c)	The Initial Debentures will be redeemable in accordance with the terms of Article 4, provided that the Initial Debentures will not be redeemable on or before November 12,
2006, except in the event of the satisfaction of certain conditions after a Change of Control has occurred as outlined herein. Subsequent to November 12, 2006 and on or prior to maturity, the Initial Debentures may be redeemed at the option of
the Corporation in whole or in part from time to time on notice as provided for in Section 4.3 provided that the U.S. Currency Equivalent Current Market Price on the date on which such notice of redemption is given is at least 130% of the Conversion
Price then in effect and the Corporation shall have provided to the Debenture Trustee an Officer’s Certificate confirming such U.S. Currency Equivalent Current Market Price. The redemption price for the Initial Debentures will be a price equal
to their principal amount plus accrued and unpaid interest. The Redemption Notice for the Initial Debentures shall be substantially in the form of Schedule B. 

  

	(d)	The Initial Debentures will be subordinated to the Senior Indebtedness of the Corporation in accordance with the provisions of Article 5. 

  

	(e)	Upon and subject to the provisions and conditions of Article 6, the holder of each Initial Debenture shall have the right at such holder’s option, at any time prior to the
close of business on the earlier of: 

  

	 	(i)	the last Business Day immediately preceding the Maturity Date of the Initial Debentures; and 

  

	 	(ii)	the last Business Day immediately preceding the date specified by the Corporation for redemption of the Initial Debentures by notice to the holders of Initial Debentures in
accordance with Sections 2.4(c) and 4.3; 

  
 (the
earlier of which will be the “Time of Expiry” for the purposes of Article 6 in respect of the Initial Debentures), to convert the whole or, in the case of an Initial Debenture of a denomination in excess of US$1,000, any part which
is US$1,000 or an integral multiple thereof, of the principal amount of a Debenture into the nearest whole number of Common Shares calculated by dividing the principal amount of the Initial Debenture presented for conversion by the Conversion Price
in effect on the Date of Conversion (as defined in Section 6.4(b)). 
  
 The Conversion Price in effect on the date hereof for each Common Share to be issued upon the conversion of Initial Debentures shall initially be equal to US$4.62. In the event the Liquidity Event has not occurred on or prior to:

  

	 	(i)	March 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.54, 

  

	 	(ii)	May 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.46, and 

  

	 	(iii)	July 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.38; 

  
 provided that the foregoing automatic adjustments shall be immediately further adjusted to reflect any Conversion Price
adjustments required by Section 6.5 hereof made prior to such automatic adjustment. Subject to the provisions of Article 5, no adjustment in the number of Common Shares to be issued upon conversion (but as yet unissued) will be made for
distributions or dividends on Common Shares issuable upon conversion or for interest accrued on Initial Debentures surrendered for conversion; however, holders converting their Debentures will be entitled to receive accrued and unpaid interest
thereon from the date hereof or from the last Interest Payment Date to which interest shall have been paid, which ever is later, up to but not including the date such conversion is effectuated (the “Conversion Date”). The Conversion
Price applicable to and the Common Shares, securities or other property receivable on the conversion of the Initial Debentures are subject to adjustment pursuant to the provisions of Section 6.5. 
  

	(f)	 The Initial Debentures shall be issued only as Fully Registered Debentures in denominations of US$1,000 and integral multiples of US$1,000. Each Initial Debenture
and the certificate of the Debenture Trustee endorsed thereon shall be issued in substantially the form set out in Schedule A, with such insertions, 

  

 10 

	 	 
omissions, substitutions or other variations as shall be required or permitted by this Indenture, and may have imprinted or otherwise reproduced thereon such
legend or legends or endorsements, not inconsistent with the provisions of this Indenture, as may be required to comply with any law or with any rules or regulations pursuant thereto or with any rules or regulations of any securities exchange or
securities regulatory authority or to conform with general usage, all as may be determined by the directors or officers of the Corporation executing such Initial Debenture in accordance with Section 2.7 hereof, as conclusively evidenced by their
execution of an Initial Debenture. Each Initial Debenture shall additionally bear such distinguishing letters and numbers as the Debenture Trustee shall approve. Notwithstanding the foregoing, an Initial Debenture may be in such other form or forms
as may, from time to time, be, approved by a resolution of the directors of the Corporation or as specified in an Officer’s Certificate and approved by the Debenture Trustee. The Initial Debentures may be engraved, lithographed, printed,
mimeographed or typewritten or partly in one form and partly in another. 

  

	(g)	Within 30 days following the occurrence of a Change of Control, and subject to the provisions and conditions of this Section 2.4(g), the Corporation shall be obligated to offer to
purchase the Initial Debentures and to purchase any Initial Debentures tendered in respect of such offer. The terms and conditions of such obligation are set forth below: 

  

	 	(i)	Within 30 days following the occurrence of a Change of Control, the Corporation shall deliver to the Debenture Trustee, and the Debenture Trustee shall promptly deliver to the
holders of the Initial Debentures a written notice stating that there has been a Change of Control and specifying the circumstances surrounding such event (a “Change of Control Notice”) together with an offer in writing (the
“Change of Control Offer”) to purchase all then outstanding Initial Debentures made in accordance with the requirements of Applicable Securities Legislation (provided that, for greater certainty, the Corporation shall use its
commercial reasonable efforts to obtain all requisite regulatory consents and to comply with Applicable Securities Legislation in connection with the receiving and completion of such Change of Control Offer) at a price (the “Offer
Price”) equal to 101% of the principal amount thereof, provided, however, that if the Change of Control occurs prior to November 12, 2006 and the U.S. Currency Equivalent of the Current Market Price on the date on which such Change of
Control Notice is given is less than the Conversion Price then in effect, then the Offer Price for such Change of Control Offer shall be (A) if the Change of Control Offer relates to a Change of Control that occurred on or prior to November 12,
2005, 119.5% of the principal amount thereof, or (B) if the Change of Control Offer relates to a Change of Control that occurred after November 12, 2005 and on or prior to November 12, 2006, 109.75% of the principal amount thereof, in each case,
plus accrued and unpaid interest on such Initial Debentures up to, but excluding, the date of acquisition by the Corporation or a related party of such Debentures (collectively, the “Total Offer Price”). 

  

	 	(ii)	If 90% or more in aggregate principal amount of Initial Debentures outstanding on the date the Corporation provides the Change of Control Notice and the Change of Control Offer to
holders of the Initial Debentures have been tendered for purchase pursuant to the Offer on the expiration thereof, the Corporation has the right and shall upon written notice provided to the Debenture Trustee within 10 days following the expiration
of the Change of Control Offer, to redeem all the Initial Debentures remaining outstanding on the expiration of the Change of Control Offer at the Total Offer Price (the “90% Redemption Right”). 

  

	 	(iii)	Upon receipt of notice that the Corporation has exercised or is exercising the 90% Redemption Right and is acquiring the remaining Initial Debentures, the Debenture Trustee shall
promptly provide written notice to each Debentureholder that did not previously accept the Change of Control Offer that: 

  

	 	(A)	the Corporation has exercised the 90% Redemption Right and is purchasing all outstanding Initial Debentures effective on the expiry of the Change of Control Offer at the Total Offer
Price, and shall include a calculation of the amount payable to such holder as payment of the Total Offer Price; 

  

 11 

	 	(B)	each such holder must transfer their Initial Debentures to the Debenture Trustee on the same terms as those holders that accepted the Change of Control Offer and must send their
respective Initial Debentures, duly endorsed for transfer, to the Debenture Trustee within 10 days after the sending of such notice; and 

  

	 	(C)	the rights of such holder under the terms of the Initial Debentures and this Indenture cease effective as of the date of expiry of the Change of Control Offer provided the
Corporation has, on or before the time of notifying the Debenture Trustee of the exercise of the 90% Redemption Right, paid the Total Offer Price to, or to the order of, the Debenture Trustee and thereafter the Initial Debentures shall not be
considered to be outstanding and the holder shall not have any right except to receive such holder’s Total Offer Price upon surrender and delivery of such holder’s Initial Debentures in accordance with the Indenture.

  

	 	(iv)	The Corporation shall, on or before 11:00 a.m., Calgary time, on the Business Day immediately prior to the expiry of the Change of Control Offer, deposit with the Debenture Trustee
or any paying agent to the order of the Debenture Trustee, such sums of money as may be sufficient to pay the Total Offer Price for each of the Initial Debentures to be purchased or redeemed by the Corporation on the expiry of the Change of Control
Offer, provided the Corporation may elect to satisfy this requirement by providing the Debenture Trustee or any paying agent with a certified cheque for such amounts required under this Section 2.4(g)(iv) post-dated to the date of expiry of the
Change of Control Offer. The Corporation shall also deposit with the Debenture Trustee a sum of money sufficient to pay any charges or expenses that may be incurred by the Debenture Trustee or any paying agent in connection with such purchase and/or
redemption, as the case may be. Every such deposit shall be irrevocable. From the sums so deposited, the Debenture Trustee or any paying agent shall pay or cause to be paid to the holders of such Initial Debentures, the Offer Price, and all accrued
and unpaid interest, if any, to which they are entitled on the Corporation’s purchase or redemption. 

  

	 	(v)	Initial Debentures for which holders have accepted the Change of Control Offer and Initial Debentures which the Corporation has elected to redeem in accordance with this Section
2.4(g) shall become due and payable at the Total Offer Price on the date of expiry of the Change of Control Offer, in the same manner and with the same effect as if it were the date of maturity specified in such Initial Debentures, anything therein
or herein to the contrary notwithstanding, and from and after such date of expiry of the Change of Control Offer, if the money necessary to purchase or redeem the Initial Debentures shall have been deposited as provided in this Section 2.4(g) and
affidavits or other proofs satisfactory to the Debenture Trustee as to the publication and/or mailing of such notices shall have been lodged with it, interest on the Initial Debentures shall cease. If any question shall arise as to whether any
notice has been given as above provided and such deposit made, such question shall be decided by the Debenture Trustee whose decision shall be final and binding upon all parties in interest. 

  

	 	(vi)	 In case the holder of any Initial Debenture to be purchased or redeemed in accordance with this Section 2.4(g) shall fail on or before the date of expiry of the
Change of Control Offer so to surrender such holder’s Initial Debenture or shall not within such time accept payment of the monies payable, or give such receipt therefor, if any, as the Debenture Trustee may require, such monies may be set
aside in trust, either in the deposit department of the Debenture Trustee or in a chartered bank, and such setting aside shall for all purposes be deemed a payment to the Debentureholder of the sum so set aside and the Debentureholder shall have no
other right except to receive payment of the monies so paid and deposited, upon surrender and delivery up of such holder’s Initial Debenture. In the event that any money required to be deposited hereunder with the Debenture Trustee or any
depository or paying agent on account of principal, premium, if any, or interest, if any, on Initial Debentures issued hereunder shall remain so deposited for a period of six years from the date of expiry of the Change of Control Offer, then such
monies, together with any accumulated interest thereon, shall at the end of such period be paid over or delivered over by the Debenture Trustee or such depository or paying agent to the Corporation and the Debenture 

  

 12 

	 	 
Trustee shall not be responsible to Debentureholders for any amounts owing to them. Notwithstanding the foregoing, the Debenture Trustee will pay any
remaining funds deposited hereunder prior to the expiry of six years after the date of expiry of the Change of Control Offer to the Corporation upon receipt from the Corporation, or one of its Subsidiaries, of an unconditional letter of credit from
a Schedule A Canadian chartered bank in an amount equal to or in excess of the amount of the remaining funds. If the remaining funds are paid to the Corporation prior to the expiry of six years after the date of expiry of the Change of Control
Offer, the Corporation shall reimburse the Debenture Trustee for any amounts required to be paid by the Debenture Trustee to a holder of a Debenture pursuant to the Change of Control Offer after the date of such payment of the remaining funds to the
Corporation but prior to six years after the date of expiry of the Change of Control Offer. 

  

	 	(vii)	Subject to the provisions above related to Initial Debentures purchased in part, all Initial Debentures redeemed and paid under this Section 2.4(g) shall forthwith be delivered to
the Debenture Trustee and cancelled and no Initial Debentures shall be issued in substitution therefor. 

  

	(h)	The Debenture Trustee shall be provided with the documents and instruments referred to in Sections 2.5(b), (c) and (d) with respect to the Initial Debentures prior to the issuance
of the Initial Debentures. 

  

	(i)	Notwithstanding any other provision of this Indenture, other than as a result of an Event of Default, the conversion of a Debenture into a Prescribed Security, or the acceptance of
the Change of Control Offer accompanying a Change of Control Notice, the Corporation shall not under any circumstances be obligated to repay more than 25% of the principal amount of the Debentures within five years from the date of issue
thereof. 

  

	(j)	The Corporation will use commercially reasonable efforts to cause a Liquidity Event to occur as soon as practicable following the date hereof. 

  

	(k)	The Corporation will, from the date hereof up to and including the Maturity Date, keep in reserve for issuance, a sufficient number of its Common Shares as are necessary to cover
the conversion rights granted to Debentureholders hereunder. 

  

	2.5	Certification and Delivery of Additional Debentures 

  
 The Corporation may from time to time request the Debenture Trustee to certify and deliver Additional Debentures of any series by delivering to the
Debenture Trustee the documents referred to below in this Section 2.5 whereupon the Debenture Trustee shall certify such Debentures and cause the same to be delivered in accordance with the Written Direction of the Corporation referred to below or
pursuant to such procedures acceptable to the Debenture Trustee as may be specified from time to time by a Written Direction of the Corporation. The Maturity Date, issue date, interest rate (if any) and any other terms of the Debentures of such
series shall be set forth in or determined by or pursuant to such Written Direction of the Corporation and procedures. In certifying such Debentures, the Debenture Trustee shall be entitled to receive and shall be fully protected in relying upon,
unless and until such documents have been superseded or revoked: 
  

	(a)	an Officer’s Certificate and/or executed supplemental indenture by or pursuant to which the form and terms of such Additional Debentures were established;

  

	(b)	a Written Direction of the Corporation requesting certification and delivery of such Initial Debentures or Additional Debentures, as the case may be, and setting forth delivery
instructions, provided that, with respect to Debentures of a series subject to a Periodic Offering:  

  

	 	(i)	such Written Direction of the Corporation may be delivered by the Corporation to the Debenture Trustee prior to the delivery to the Debenture Trustee of such Debentures of such
series for certification and delivery; 

  

 13 

	 	(ii)	the Debenture Trustee shall certify and deliver such Debentures of such series for original issue from time to time, in an aggregate principal amount not exceeding the aggregate
principal amount, if any, established for such series, pursuant to a Written Direction of the Corporation or pursuant to procedures acceptable to the Debenture Trustee as may be specified from time to time by a Written Direction of the Corporation;

  

	 	(iii)	the maturity date or dates, issue date or dates, interest rate or rates (if any) and any other terms of such Debentures of such series shall be determined by an executed
supplemental indenture or by Written Direction of the Corporation or pursuant to such procedures; and 

  

	 	(iv)	if provided for in such procedures, such Written Direction of the Corporation may authorize certification and delivery pursuant to oral or electronic instructions from the
Corporation which oral or electronic instructions shall be promptly confirmed in writing; 

  

	(c)	an opinion of Counsel, in form and substance satisfactory to the Debenture Trustee, acting reasonably, to the effect that all requirements imposed by this Indenture or by law in
connection with the proposed issue of the Initial Debentures or Additional Debentures, as the case may be, have been complied with, subject to the delivery of certain documents or instruments specified in such opinion; and 

 

	(d)	an Officer’s Certificate certifying that the Corporation is not in default under this Indenture, that the terms and conditions for the certification and delivery of the Initial
Debentures or Additional Debentures (including those set forth in Section 14.5), as the case may be, have been complied with subject to the delivery of any documents or instruments specified in such Officer’s Certificate and that no Event of
Default exists or will exist upon such certification and delivery. 

  

	2.6	Issue of Global Debentures 

  

	(a)	The Corporation may specify that the Debentures of a series are to be issued in whole or in part as one or more Global Debentures registered in the name of a Depository, or its
nominee, designated by the Corporation in the Written Direction of the Corporation delivered to the Debenture Trustee at the time of issue of such Debentures, and in such event the Corporation shall execute and the Debenture Trustee shall certify
and deliver one or more Global Debentures that shall: 

  

	 	(i)	represent an aggregate amount equal to the principal amount of the outstanding Debentures of such series to be represented by one or more Global Debentures;

  

	 	(ii)	be delivered by the Debenture Trustee to such Depository or pursuant to such Depository’s instructions; and 

  

	 	(iii)	bear a legend substantially to the following effect: 

  
 “This Debenture is a Global Debenture within the meaning of the Indenture herein referred to and is registered in the name of a Depository or a
nominee thereof. This Debenture may not be transferred to or exchanged for Debentures registered in the name of any person other than the Depository or a nominee thereof and no such transfer may be registered except in the limited circumstances
described in the Indenture. Every Debenture authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, this Debenture shall be a Global Debenture subject to the foregoing, except in such limited circumstances
described in the Indenture. 
  
 Unless this Debenture is
presented by an authorized representative of The Canadian Depository for Securities Limited (“CDS”) to Gastar Exploration Ltd. or its agent for registration of transfer, exchange or payment, and any Debenture issued in respect thereof is
registered in the name of CDS & Co., or in such other name as is requested 

  

 14 

 
by an authorized representative of CDS, (and any payment is made to CDS & Co. or to such entity as is requested by an authorized representative of CDS)
ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE OR TO ANY PERSON IS WRONGFUL since as the registered holder hereof, CDS & Co. has an interest herein.” 
  

	(b)	Each Depository designated for a Global Debenture must, at the time of its designation and at all times while it serves as such Depository, be a clearing agency registered or
designated under the securities legislation of the jurisdiction where the Depository has its principal offices. 

  

	2.7	Execution of Debentures 

  
 All Debentures shall be signed (either manually or by facsimile signature) by any one authorized director or officer of the Corporation, on behalf of the
Corporation, holding office at the time of signing. A facsimile signature upon a Debenture shall for all purposes of this Indenture be deemed to be the signature of the person whose signature it purports to be. Notwithstanding that any person whose
signature, either manual or in facsimile, appears on a Debenture as a director or officer may no longer hold such office at the date of the Debenture or at the date of the certification and delivery thereof, such Debenture shall be valid and binding
upon the Corporation and entitled to the benefits of this Indenture. 
  

	2.8	Certification 

  

	(a)	No Debenture shall be issued or, if issued, shall be obligatory or shall entitle the holder to the benefits of this Indenture, until it has been manually certified by or on behalf
of the Debenture Trustee substantially in the form set out in this Indenture, in the relevant supplemental indenture, or in some other form approved by the Debenture Trustee. Such certification on any Debenture shall be conclusive evidence that such
Debenture is duly issued, is a valid obligation of the Corporation and the holder is entitled to the benefits hereof. 

  

	(b)	The certificate of the Debenture Trustee signed on the Debentures, or interim Debentures hereinafter mentioned, shall not be construed as a representation or warranty by the
Debenture Trustee as to the validity of this Indenture or of the Debentures or interim Debentures or as to the issuance of the Debentures or interim Debentures and the Debenture Trustee shall in no respect be liable or answerable for the use made of
the Debentures or interim Debentures or any of them or the proceeds thereof. The certificate of the Debenture Trustee signed on the Debentures or interim Debentures shall, however, be a representation and warranty by the Debenture Trustee that the
Debentures or interim Debentures have been duly certified by or on behalf of the Debenture Trustee pursuant to the provisions of this Indenture. 

  

	2.9	Interim Debentures or Certificates 

  
 Pending the delivery of definitive Debentures of any series to the Debenture Trustee, the Corporation may issue and the Debenture Trustee certify in lieu
thereof interim Debentures in such forms and in such denominations and signed in such manner as provided herein, entitling the holders thereof to definitive Debentures of the series when the same are ready for delivery; or the Corporation may
execute and the Debenture Trustee certify a temporary Debenture for the whole principal amount of Debentures of the series then authorized to be issued hereunder and deliver the same to the Debenture Trustee and thereupon the Debenture Trustee may
issue its own interim certificates in such form and in such amounts, not exceeding in the aggregate the principal amount of the temporary Debenture so delivered to it, as the Corporation, and the Debenture Trustee may approve entitling the holders
thereof to definitive Debentures of the series when the same are ready for delivery; and, when so issued and certified, such interim or temporary Debentures or interim certificates shall, for all purposes but without duplication, rank in respect of
this Indenture equally with Debentures duly issued hereunder and, pending the exchange thereof for definitive Debentures, the holders of the interim or temporary Debentures or interim certificates shall be deemed without duplication to be
Debentureholders and entitled to the benefit of this Indenture to the same extent and in the same manner as though the said exchange had actually been made. Forthwith after the Corporation shall have delivered the definitive Debentures to the
Debenture Trustee, the Debenture Trustee shall cancel such temporary Debentures, if any, and shall call in for exchange all interim Debentures or certificates that shall have been issued 

  

 15 

 
and forthwith after such exchange shall cancel the same. No charge shall be made by the Corporation or the Debenture Trustee to the holders of such interim
or temporary Debentures or interim certificates for the exchange thereof. All interest paid upon interim or temporary Debentures or interim certificates shall be noted thereon as a condition precedent to such payment unless paid by cheque to the
registered holders thereof. 
  

	2.10	Mutilation, Loss, Theft or Destruction 

  
 In case any of the Debentures issued hereunder shall become mutilated or be lost, stolen or destroyed, the Corporation, in its discretion, may issue, and
thereupon the Debenture Trustee shall certify and deliver, a new Debenture upon surrender and cancellation of the mutilated Debenture, or in the case of a lost, stolen or destroyed Debenture, in lieu of and in substitution for the same, and the
substituted Debenture shall be in a form approved by the Debenture Trustee and shall be entitled to the benefits of this Indenture and rank equally in accordance with its terms with all other Debentures issued or to be issued hereunder. In case of
loss, theft or destruction the applicant for a substituted Debenture shall furnish to the Corporation and to the Debenture Trustee such evidence of the loss, theft or destruction of the Debenture as shall be satisfactory to each of them in their
discretion and shall also furnish an indemnity satisfactory to each of them in their discretion. The applicant shall pay all reasonable expenses incidental to the issuance of any substituted Debenture. 
  

	2.11	Concerning Interest 

  

	(a)	All Debentures issued hereunder, whether originally or upon exchange or in substitution for previously issued Debentures which are interest bearing, shall bear interest (i) from and
including their issue date, or with respect to the Initial Debentures, as provided in Section 2.4(b) or (ii) from and including the last Interest Payment Date to which interest shall have been paid or made available for payment on the outstanding
Debentures of that series, whichever shall be the later, or, in respect of Debentures subject to a Periodic Offering, from and including their issue date or from and including the last Interest Payment Date to which interest shall have been paid or
made available for payment on such Debentures, in all cases, to but excluding the next Interest Payment Date; 

  

	(b)	Unless otherwise specifically provided in the terms of the Debentures of any series, interest for any period of less than six months shall be computed on the basis of a year of 365
days. Subject to Section 2.4(b) in respect of the method for calculating the amount of interest to be paid on the Initial Debentures on the first Interest Payment Date in respect thereof, with respect to any series of Debentures, whenever interest
is computed on a basis of a year (the “deemed year”) which contains fewer days than the actual number of days in the calendar year of calculation, such rate of interest shall be expressed as a yearly rate for purposes of the
Interest Act (Canada) by multiplying such rate of interest by the actual number of days in the calendar year of calculation and dividing it by the number of days in the deemed year. 

  

	2.12	Debentures to Rank Pari Passu 

  
 The Debentures will be direct unsecured obligations of the Corporation. Each Debenture of the same series of Debentures will rank pari passu with
each other Debenture of the same series (regardless of their actual date or terms of issue) and, subject to statutory preferred exceptions, with all other present and future subordinated and unsecured indebtedness of the Corporation except for
sinking fund provisions (if any) applicable to different series of Debentures or other similar types of obligations of the Corporation. 
  

	2.13	Payments of Amounts Due on Maturity 

  

	(a)	 Except as may otherwise be provided in any supplemental indenture in respect of any series of Debentures, payments of amounts due upon maturity of the Debentures
will be made in the following manner. The Corporation will establish and maintain with the Debenture Trustee a Maturity Account for each series of Debentures. Each such Maturity Account shall be maintained by and be subject to the control of the
Debenture Trustee for the purposes of this Indenture. On or before 11:00 a.m., Calgary time on the Business Day immediately prior to each Maturity Date for Debentures outstanding from time to time under this Indenture, the Corporation will deliver
to the Debenture Trustee a certified cheque for deposit in the 

  

 16 

	 	 
applicable Maturity Account in an amount sufficient to pay the cash amount payable in respect of such Debentures (including the principal amount together
with any accrued and unpaid interest thereon, less any tax required by law to be deducted). The Debenture Trustee, on behalf of the Corporation, will pay to each holder entitled to receive payment the principal amount of and premium (if any) and
accrued and unpaid interest on the Debenture, upon surrender of the Debenture at any branch of the Debenture Trustee designated for such purpose from time to time by the Corporation and the Debenture Trustee. The delivery of such funds to the
Debenture Trustee for deposit to the applicable Maturity Account will satisfy and discharge the liability of the Corporation for the Debentures to which the delivery of funds relates to the extent of the amount delivered (plus the amount of any tax
deducted as aforesaid) and such Debentures will thereafter to that extent not be considered as outstanding under this Indenture and such holder will have no other right in regard thereto other than to receive out of the money so delivered or made
available the amount to which it is entitled. 

  

	(b)	Notwithstanding Section 2.13(a), if a series of Debentures is represented by a Global Debenture, then all payments of amounts due on maturity (including the principal amount
together with any accrued and unpaid interest thereon) on the Global Debentures representing such Debentures shall be made by certified cheque, bank draft or electronic transfer of funds made payable to the Depository or its nominee for subsequent
payment by the Depository to Beneficial Holders of interests in that Global Debenture, unless the Corporation and the Depository otherwise agree. Provided the Corporation has made the payment of amounts due on maturity of the Global Debentures to
the Depository as contemplated herein, none of the Corporation, the Debenture Trustee or any agent of the Debenture Trustee for any Debenture will be liable or responsible to any person for any aspect of the records related to or payments made on
account of beneficial interests in any Global Debenture or for maintaining, reviewing, or supervising any records relating to such beneficial interests. 

  

	2.14	Resale Restrictions and Legends 

  
 The Initial Debentures will be distributed pursuant to exemptions from the prospectus and/or registration requirements of Applicable Securities
Legislation and accordingly there will be restrictions imposed by Applicable Securities Legislation on the resale of the Initial Debentures and the Common Shares issuable upon conversion thereof. All resales of Initial Debentures and the Common
Shares issuable upon conversion thereof are subject to restrictions in the United States and Canada as a result of application of the 1933 Act and rules promulgated thereunder. A description of restrictions on resales of the Initial Debentures and
Common Shares issuable upon conversion thereof in the United States and Canada is set forth below in Section 2.14(a). In Canada, in addition to the restrictions set forth below in Section 2.14(a), resales of Initial Debentures and Common Shares
issuable upon conversion thereof may only be made under a further exemption and all Initial Debentures shall bear the legend set forth below in Section 2.14(b). 
  

	(a)	The Initial Debentures and the Common Shares issuable upon conversion thereof have not been initially registered under the 1933 Act. Accordingly, all Initial Debentures and the
Common Shares issuable upon conversion thereof, as, shall bear the following legend (the “US Legend”): 

  
 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “U.S. SECURITIES
ACT”) OR STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING SUCH SECURITIES, AGREES FOR THE BENEFIT OF GASTAR EXPLORATION LTD. THAT SUCH SECURITIES MAY BE OFFERED, SOLD OR OTHERWISE TRANSFERRED ONLY (A) TO GASTAR EXPLORATION LTD., (B)
OUTSIDE THE UNITED STATES IN ACCORDANCE WITH REGULATION S UNDER THE U.S. SECURITIES ACT, (C) INSIDE OR OUTSIDE THE UNITED STATES, PURSUANT TO THE EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER, (D) TO A
PERSON THE HOLDER REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE U.S. SECURITIES ACT) PURCHASING FOR ITS OWN ACCOUNT OR FOR THE 

  

 17 

 
ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, OR (E) PURSUANT TO A REGISTRATION STATEMENT EFFECTIVE
UNDER THE U.S. SECURITIES ACT AND COVERING SUCH OFFER, SALE OR TRANSFER (IT BEING UNDERSTOOD THAT THE ISSUER SHALL BE UNDER NO OBLIGATION TO FILE SUCH REGISTRATION STATEMENT). HEDGING TRANSACTIONS INVOLVING THE SECURITIES REPRESENTED HEREBY MAY NOT
BE CONDUCTED EXCEPT IN COMPLIANCE WITH THE U.S. SECURITIES ACT. 
  
 A NEW CERTIFICATE BEARING NO LEGEND MAY BE OBTAINED FROM CIBC MELLON TRUST COMPANY UPON DELIVERY OF AN OPINION OF COUNSEL, IN A FORM SATISFACTORY TO CIBC MELLON TRUST COMPANY AND GASTAR EXPLORATION LTD., TO THE EFFECT THAT THE SALE OF THE
SECURITIES REPRESENTED HEREBY IS BEING MADE IN COMPLIANCE WITH RULE 144 UNDER THE SECURITIES ACT TOGETHER WITH OTHER DOCUMENTATION REASONABLY REQUESTED BY CIBC MELLON TRUST COMPANY OR GASTAR EXPLORATION LTD.” 
  
 provided, that if the Initial Debentures or the Common Shares issuable upon
conversion thereof are being sold in compliance with the requirements of Rule 144 under the 1933 Act or pursuant to an effective registration statement under the 1933 Act, the above legend may be removed by delivery to the Debenture Trustee of (i)
an opinion of Counsel of recognized standing reasonably satisfactory to the Corporation to the effect that the Initial Debentures or Common Shares issuable upon conversion thereof, held by it are being sold pursuant to Rule 144 of the 1933 Act or
pursuant to an effective Registration Statement under the 1933 Act, as the case may be, and (ii) such other documentation reasonably requested by the Debenture Trustee or the Corporation; and 
  
 provided, further, that if (i) a holder of Initial Debentures is not an
“affiliate” (as defined in Rule 405 under the 1933 Act) of the Corporation, (ii) the holder has not been such an affiliate in the preceding three months, and (iii) at least two years (or such shorter period as may be permitted under Rule
144(k) or any successor rule promulgated under the 1933 Act) have elapsed since the later of the date the Initial Debentures were acquired from the Corporation or from an affiliate of the Corporation, then the US Legend may be removed from any
certificates representing the Initial Debentures or Common Shares issuable upon conversion thereof, held by it by delivery to the Debenture Trustee of an opinion of counsel of recognized standing reasonably satisfactory to the Corporation, to the
effect that any such Initial Debentures or Common Shares issuable upon conversion thereof, held by it may be sold pursuant to Rule 144(k) (or any successor rule) promulgated under the 1933 Act and such legend is no longer required under applicable
requirements of the 1933 Act or state securities laws; and the Corporation shall use its reasonable best efforts to cause the registrar and transfer agent of the Corporation to remove the foregoing U.S. Legend within three business days (excluding
weekends and holidays) of receipt of the foregoing, as applicable. 
  

	(b)	The Initial Debentures have been issued in Canada pursuant to exemptions from prospectus requirements of Applicable Securities Legislation and each Initial Debenture and, until
March 13, 2005, the Common Shares issuable upon conversion thereof, shall bear a legend to the following effect (the “Canadian Legend”): 

  
 “UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE MARCH
13, 2005.” 
  

	(c)	 If Initial Debentures or certificates for Common Shares bearing a US Legend and/or Canadian Legend are presented to the Debenture Trustee for exchange, the
Debenture Trustee shall deliver to the holder thereof new certificates bearing the US Legend and/or Canadian Legend, as applicable, in the name requested, representing the appropriate aggregate number of securities; provided, that the legends may be
removed in accordance with Section 2.14(a) and 2.14(b). Unless and until the US Legend is removed pursuant to 

  

 18 

	 	 
Section 2.14(a), no transfer of an Initial Debenture or Underlying Shares shall be made without an opinion of Counsel of recognized standing reasonably
satisfactory to the Corporation to the effect that such transfer is being made in compliance with Regulation S promulgated under the 1933 Act or another exemption from the registration provisions of the 1933 Act. 

  

	(d)	Prior to the issuance of the Initial Debentures, the Corporation shall notify the Debenture Trustee, in writing, concerning the aggregate amount of Initial Debentures in respect of
which the Global Certificates are to bear the US Legend. The Debenture Trustee will thereafter maintain a list of all registered holders from time to time of Legended Debentures. 

  

	2.15	Payment of Interest 

  
 The following provisions shall apply to Debentures, except as otherwise provided in Section 2.4(b) or specified in a resolution of the directors of the
Corporation, an Officer’s Certificate or a supplemental indenture relating to a particular series of Additional Debentures: 
  

	(a)	As interest becomes due on each Debenture (except on conversion or on redemption, when interest may at the option of the Corporation be paid upon surrender of such Debenture) the
Corporation, either directly or through the Debenture Trustee or any agent of the Debenture Trustee, shall send or forward by prepaid ordinary mail, electronic transfer of funds or such other means as may be agreed to by the Debenture Trustee,
payment of such interest (less any tax required to be withheld therefrom) to the order of the registered holder of such Debenture appearing on the registers maintained by the Debenture Trustee at the close of business on the seventh Business Day
prior to the applicable Interest Payment Date and addressed to the holder at the holder’s last address appearing on the register, unless such holder otherwise directs. If payment is made by cheque, such cheque shall be forwarded at least three
days prior to each date on which interest becomes due and if payment is made by other means (such as electronic transfer of funds, provided the Debenture Trustee must receive confirmation of receipt of funds prior to being required to wire funds to
holders), such payment shall be made in a manner whereby the holder receives credit for such payment on the date such interest on such Debenture becomes due. The mailing of such cheque or the making of such payment by other means shall, to the
extent of the sum represented thereby, plus the amount of any tax withheld as aforesaid, satisfy and discharge all liability for interest on such Debenture, unless in the case of payment by cheque, such cheque is not paid at par on presentation. In
the event of non-receipt of any cheque for or other payment of interest by the person to whom it is so sent as aforesaid, the Corporation will issue to such person a replacement cheque or other payment for a like amount upon being furnished with
such evidence of non-receipt as it shall reasonably require and upon being indemnified to its satisfaction. Notwithstanding the foregoing, if the Corporation is prevented by circumstances beyond its control (including, without limitation, any
interruption in mail service) from making payment of any interest due on each Debenture in the manner provided above, the Corporation may make payment of such interest or make such interest available for payment in any other manner acceptable to the
Debenture Trustee with the same effect as though payment had been made in the manner provided above. 

  

	(b)	Notwithstanding Section 2.15,(a) if a series of Debentures is represented by a Global Debenture, then all payments of interest on the Global Debenture representing such Debentures
shall be made by certified cheque, bank draft or electronic transfer of funds made payable to the Depository or its nominee for subsequent payment by the Depository to Beneficial Holders of interests in that Global Debenture, unless the Corporation
and the Depository otherwise agree. Provided the Corporation has made the payment of amounts due on maturity of the Global Debentures to the Depository as contemplated herein, none of the Corporation, the Debenture Trustee or any agent of the
Debenture Trustee for any Debenture will be liable or responsible to any person for any aspect of the records related to or payments made on account of beneficial interests in any Global Debenture or for maintaining, reviewing, or supervising any
records relating to such beneficial interests. 

  

 19 

 ARTICLE 3 
 REGISTRATION, TRANSFER, EXCHANGE AND OWNERSHIP 
  

	3.1	Global Debentures 

  

	(a)	With respect to each series of Debentures issuable in whole or in part as one or more Global Debentures, the Corporation shall cause to be kept by and at the principal office of the
Debenture Trustee and by the Debenture Trustee or such other registrar as the Corporation, with the approval of the Debenture Trustee, may appoint at such other place or places, if any, as the Corporation may designate with the approval of the
Debenture Trustee, a register in which shall be entered the name and address of the holder of each such Global Debenture (being the Depository, or its nominee, for such Global Debenture) as holder thereof and particulars of the Global Debenture held
by it, and of all transfers thereof. If any Debentures of such series are at any time not Global Debentures, the provisions of Section 3.2 shall govern with respect to registrations and transfers of such Debentures. 

  

	(b)	Notwithstanding any other provision of this Indenture, a Global Debenture may not be transferred by the registered holder thereof and accordingly, no definitive certificates shall
be issued to Beneficial Holders of Debentures except in the following circumstances or as otherwise specified in a resolution of the directors of the Corporation, Officer’s Certificate or supplemental indenture relating to a particular series
of Additional Debentures: 

  

	 	(i)	Global Debentures may be transferred by a Depository to a nominee of such Depository or by a nominee of a Depository to such Depository or to another nominee of such Depository or
by a Depository or its nominee to a successor Depository or its nominee; 

  

	 	(ii)	Global Debentures may be transferred at any time after the Depository for such Global Debentures (i) has notified the Debenture Trustee in writing, or the Corporation has notified
the Debenture Trustee in writing, that it is unwilling or unable to continue as Depository for such Global Debentures, or (ii) ceases to be eligible to be a Depository under Section 2.6(b), provided that at the time of such transfer the Corporation
has not appointed a successor Depository for such Global Debentures; 

  

	 	(iii)	Global Debentures may be transferred at any time after the Corporation has determined, in its sole discretion, to terminate the book-entry only registration system in respect of
such Global Debentures and has communicated such determination to the Debenture Trustee in writing; 

  

	 	(iv)	Global Debentures may be transferred at any time after the Debenture Trustee has determined that an Event of Default has occurred and is continuing with respect to the Debentures of
the series issued as a Global Debenture, provided that Beneficial Holders of the Debentures representing, in the aggregate, not less than 25% of the aggregate principal amount of the Debentures of such series advise the Depository in writing,
through the Depository Participants, that the continuation of the book-entry only registration system for such series of Debentures is no longer in their best interest and also provided that at the time of such transfer the Debenture Trustee has not
waived the Event of Default pursuant to Section 8.3; 

  

	 	(v)	Global Debentures may be transferred if required by applicable law; or 

  

	 	(vi)	Global Debentures may be transferred if the book-entry only registration system ceases to exist. 

  

	(c)	With respect to the Global Debentures, unless and until definitive certificates have been issued to Beneficial Holders pursuant to subsection 3.2(b): 

  

	 	(i)	the Corporation and the Debenture Trustee may deal with the Depository for all purposes (including paying interest on the Debentures) as the sole holder of such series of Debentures
and the authorized representative of the Beneficial Holders; 

  

 20 

	 	(ii)	the rights of the Beneficial Holders shall be exercised only through the Depository and shall be limited to those established by law and agreements between such Beneficial Holders
and the Depository or the Depository Participants; 

  

	 	(iii)	the Depository will make book entry transfers among the Depository Participants; and 

  

	 	(iv)	whenever this Trust Indenture requires or permits actions to be taken based upon instruction or directions of Debentureholders evidencing a specified percentage of the outstanding
Debentures, the Depository shall be deemed to be counted in that percentage only to the extent that it has received instructions to such effect from the Beneficial Holders or the Depository Participant, and has delivered such instructions in writing
to the Debenture Trustee. 

  

	(d)	Whenever a notice or other communication is required to be provided to Debentureholders, unless and until definitive certificate(s) have been issued to Beneficial Holders pursuant
to this Section 3.1, the Debenture Trustee shall provide all such notices and communications to the Depository and the Depository shall deliver such notices and communications to such Beneficial Holders in accordance with Applicable Securities
Legislation (including national policies or instruments). Upon the termination of the book-entry only registration system on the occurrence of one of the conditions specified in Section 3.1(b) with respect to a series of Debentures issued hereunder,
the Debenture Trustee shall notify all applicable Beneficial Holders, through the Depository, of the availability of definitive Debenture certificates. Upon surrender by the Depository of the certificate(s) representing the Global Debentures and
receipt of new registration instructions from the Depository, the Debenture Trustee shall deliver the definitive Debenture certificates for such Debentures to the holders thereof in accordance with the new registration instructions and thereafter,
the registration and transfer of such Debentures will be governed by Section 3.2 and the remaining Sections of this Article 3. 

  

	3.2	Fully Registered Debentures 

  

	(a)	With respect to each series of Debentures issuable as Fully Registered Debentures, the Corporation shall cause to be kept by and at the principal office of the Debenture Trustee in
Calgary and by the Debenture Trustee or such other registrar as the Corporation, with the approval of the Debenture Trustee, may appoint at such other place or places, if any, as may be specified in the Debentures of such series or as the
Corporation may designate with the approval of the Debenture Trustee, a register in which shall be entered the names and addresses of the holders of Fully Registered Debentures and particulars of the Debentures held by them respectively and of all
transfers of Fully Registered Debentures. Such registration shall be noted on the Debentures by the Debenture Trustee or other registrar unless a new Debenture shall be issued upon such transfer.  

  

	(b)	No transfer of a Fully Registered Debenture shall be valid unless made on such register referred to in Section 3.2(a) by the registered holder or such holder’s executors,
administrators or other legal representatives or an attorney duly appointed by an instrument in writing in form and execution satisfactory to the Debenture Trustee or other registrar upon surrender of the Debentures together with a duly executed
form of transfer acceptable to the Debenture Trustee and upon compliance with such other reasonable requirements as the Debenture Trustee or other registrar may prescribe, nor unless the name of the transferee shall have been noted on the Debenture
by the Debenture Trustee or other registrar. 

  

	3.3	Transferee Entitled to Registration 

  
 The transferee of a Debenture shall be entitled, after the appropriate form of transfer is lodged with the Debenture Trustee or other registrar and upon
compliance with all other conditions in that behalf required by this Indenture or by law, to be entered on the register as the owner of such Debenture free from all equities or rights of set-off or counterclaim between the Corporation and the
transferor or any previous holder of such Debenture, save in respect of equities of which the Corporation is required to take notice by statute or by order of a court of competent jurisdiction. 
  

 21 

	3.4	No Notice of Trusts 

  
 Neither the Corporation nor the Debenture Trustee nor any registrar shall be bound to take notice of or see to the execution of any trust (other than that
created by this Indenture) whether express, implied or constructive, in respect of any Debenture, and may transfer the same on the direction of the person registered as the holder thereof, whether named as trustee or otherwise, as though that person
were the beneficial owner thereof. 
  

	3.5	Registers Open for Inspection 

  
 The registers referred to in Sections 3.1 and 3.2 shall at all reasonable times during regular business hours be open for inspection by the Corporation,
the Debenture Trustee or any Debentureholder. Every registrar, including the Debenture Trustee, shall from time to time when requested so to do by the Corporation or by the Debenture Trustee, in writing, furnish the Corporation or the Debenture
Trustee, as the case may be, with a list of names and addresses of holders of registered Debentures entered on the register kept by them and showing the principal amount and serial numbers of the Debentures held by each such holder, provided the
Debenture Trustee shall be entitled to charge a reasonable fee to provide such a list. 
  

	3.6	Exchanges of Debentures 

  

	(a)	Subject to Section 3.7, Debentures in any authorized form or denomination, other than Global Debentures, may be exchanged for Debentures in any other authorized form or
denomination, of the same series and date of maturity, bearing the same interest rate and of the same aggregate principal amount as the Debentures so exchanged. 

  

	(b)	In respect of exchanges of Debentures permitted by Section 3.6(a), Debentures of any series may be exchanged only at the principal offices of the Debenture Trustee in the City of
Calgary or at such other place or places, if any, as may be specified in the Debentures of such series and at such other place or places as may from time to time be designated by the Corporation with the approval of the Debenture Trustee. Any
Debentures tendered for exchange shall be surrendered to the Debenture Trustee. The Corporation shall execute and the Debenture Trustee shall certify all Debentures necessary to carry out exchanges as aforesaid. All Debentures surrendered for
exchange shall be cancelled. 

  

	(c)	Debentures issued in exchange for Debentures which at the time of such issue have been selected or called for redemption at a later date shall be deemed to have been selected or
called for redemption in the same manner and shall have noted thereon a statement to that effect. 

  

	3.7	Closing of Registers 

  

	(a)	Neither the Corporation nor the Debenture Trustee nor any registrar shall be required to: 

  

	 	(i)	make transfers or exchanges of Fully Registered Debentures on any Interest Payment Date for such Debentures or during the seven preceding Business Days; 

  

	 	(ii)	make transfers or exchanges of any Debentures on the day of any selection by the Debenture Trustee of Debentures to be redeemed or during the seven preceding Business Days; or

  

	 	(iii)	make exchanges of any Debentures which will have been selected or called for redemption unless upon due presentation thereof for redemption such Debentures shall not be redeemed.

  

	(b)	Subject to any restriction herein provided, the Corporation with the approval of the Debenture Trustee may at any time close any register for any series of Debentures, other than
those kept at the principal office of the Debenture Trustee in Calgary, and transfer the registration of any Debentures registered thereon to another register (which may be an existing register) and thereafter such Debentures shall be deemed to be
registered on such other register. Notice of such transfer shall be given to the holders of such Debentures. 

  

 22 

	3.8	Charges for Registration, Transfer and Exchange 

  
 For each Debenture exchanged, registered, transferred or discharged from registration, the Debenture Trustee or other registrar, except as otherwise
herein provided, may make a reasonable charge for its services and in addition may charge a reasonable sum for each new Debenture issued (such amounts to be agreed upon by the Debenture Trustee and the Corporation from time to time), and payment of
such charges and reimbursement of the Debenture Trustee or other registrar for any stamp taxes or governmental or other charges required to be paid shall be made by the party requesting such exchange, registration, transfer or discharge from
registration as a condition precedent thereto. Notwithstanding the foregoing provisions, no charge shall be made to a Debentureholder hereunder: 
  

	(a)	for any exchange, registration, transfer or discharge from registration of any Debenture applied for within a period of two months from the date of the first delivery of Debentures
of that series or, with respect to Debentures subject to a Periodic Offering, within a period of two months from the date of delivery of any such Debenture; 

  

	(b)	for any exchange of any interim or temporary Debenture or interim certificate that has been issued under Section 2.9 for a definitive Debenture; 

  

	(c)	for any exchange of a Global Debenture as contemplated in Section 3.1; or 

  

	(d)	for any exchange of any Debenture resulting from a partial redemption under Section 4.2. 

  

	3.9	Ownership of Debentures 

  

	(a)	Unless otherwise required by law, the person in whose name any registered Debenture is registered shall for all the purposes of this Indenture be and be deemed to be the owner
thereof and payment of or on account of the principal of and premium, if any, on such Debenture and interest thereon shall be made to such registered holder. 

  

	(b)	The registered holder for the time being of any registered Debenture shall be entitled to the principal, premium, if any, and/or interest evidenced by such instruments,
respectively, free from all equities or rights of set-off or counterclaim between the Corporation and the original or any intermediate holder thereof and all persons may act accordingly and the receipt of any such registered holder for any such
principal, premium or interest shall be a good discharge to the Corporation and/or the Debenture Trustee for the same and neither the Corporation nor the Debenture Trustee shall be bound to inquire into the title of any such registered holder.

  

	(c)	Where Fully Registered Debentures are registered in more than one name, the principal, premium, if any, and interest from time to time payable in respect thereof may be paid to the
order of all such holders, failing written instructions from them to the contrary, and the receipt of any one of such holders therefor shall be a valid discharge, to the Debenture Trustee, any registrar and to the Corporation.

  

	(d)	In the case of the death of one or more joint holders of any Fully Registered Debenture the principal, premium, if any, and interest from time to time payable thereon may be paid to
the order of the survivor or survivors of such registered holders and the receipt of any such survivor or survivors therefor shall be a valid discharge to the Debenture Trustee and any registrar and to the Corporation. 

  
 ARTICLE 4 
 REDEMPTION AND PURCHASE OF DEBENTURES 
  

	4.1	Applicability of Article 

  

	(a)	 Subject to regulatory approval, the Corporation shall have the right, at its option to redeem, either in whole at any time or in part from time to time before
maturity, any Debentures issued hereunder of any series 

  

 23 

	 	 
which by their terms are made so redeemable (subject, however, to any applicable restriction on the redemption of Debentures of such series) at such rate or
rates of premium, if any, and on such date or dates and in accordance with such other provisions as shall have been determined at the time of issue of such Debentures and as shall have been expressed in this Indenture, in the Debentures, in an
Officer’s Certificate, or in a supplemental indenture authorizing or providing for the issue thereof, or in the case of Additional Debentures issued pursuant to a Periodic Offering, in the Written Direction of the Corporation requesting the
certification and delivery thereof. 

  

	(b)	Subject to regulatory approval, the Corporation shall also have the right at its option to repay, either in whole or in part, on maturity, by payment of money in accordance with
Section 2.13, any Debentures issued hereunder of any series which by their terms are made so repayable on maturity (subject however, to any applicable restriction on the repayment of the principal amount of the Debentures of such series) at such
rate or rates of premium, if any, and on such date or dates and in accordance with such other provisions as shall have been determined at the time of issue of such Debenture and shall have been expressed in this Indenture, in the Debentures, in an
Officer’s Certificate, or in a supplemental indenture authorizing or providing for the issue thereof, or in the case of Additional Debentures issued pursuant to a Periodic Offering, in the Written Direction of the Corporation requesting the
certification and delivery thereof. 

  

	4.2	Partial Redemption 

  
 If less than all the Debentures of any series for the time being outstanding are at any time to be redeemed, the Debentures to be so redeemed shall be
selected by the Debenture Trustee on a pro rata basis to the nearest multiple of US$1,000 in accordance with the principal amount of the Debentures registered in the name of each holder or in such other manner as the Debenture Trustee deems
equitable, subject to the approval of the Toronto Stock Exchange. Unless otherwise specifically provided in the terms of any series of Debentures, no Debenture shall be redeemed in part unless the principal amount redeemed is US$1,000 or a multiple
thereof. For this purpose, the Debenture Trustee may make, and from time to time vary, regulations with respect to the manner in which such Debentures may be drawn for redemption and regulations so made shall be valid and binding upon all holders of
such Debentures notwithstanding the fact that as a result thereof one or more of such Debentures may become subject to redemption in part only. In the event that one or more of such Debentures becomes subject to redemption in part only, upon
surrender of any such Debentures for payment of the Redemption Price, together with interest accrued to but excluding the Redemption Date, with respect to one or more Global Debentures, the Depository shall make notations on the Global Debenture of
the principal amount thereof so redeemed or, if the Debentures are then in fully registered form, the Corporation shall execute and the Debenture Trustee shall certify and deliver without charge to the holder thereof or upon the holder’s order
one or more new Debentures for the unredeemed part of the principal amount of the Debenture or Debentures so surrendered. Unless the context otherwise requires, the terms “Debenture” or “Debentures” as used in this Article 4
shall be deemed to mean or include any part of the principal amount of any Debenture which in accordance with the foregoing provisions has become subject to redemption. 
  

	4.3	Notice of Redemption 

  
 Notice of redemption (the “Redemption Notice”) of any series of Debentures shall be given to the holders of the Debentures so to be
redeemed not more than 60 days nor less than 30 days prior to the date fixed for redemption (the “Redemption Date”) in the manner provided in Section 13.2. Every such notice shall specify the aggregate principal amount of
Debentures called for redemption, the Redemption Date, the Redemption Price and the places of payment and shall state that interest upon the principal amount of Debentures called for redemption shall cease to be payable from and after the Redemption
Date. In addition, unless all the outstanding Debentures are to be redeemed, the Redemption Notice shall specify: 
  

	(a)	in the case of a Global Debenture, the manner in which the redemption will take place (as agreed upon by the Depository, the Debenture Trustee and the Corporation);

  

	(b)	if applicable, the distinguishing letters and numbers of the registered Debentures which are to be redeemed (or of such thereof as are registered in the name of such
Debentureholder); 

  

 24 

	(c)	in the case of a published notice, if applicable, the distinguishing letters and numbers of the Debentures which are to be redeemed or, if such Debentures are selected by terminal
digit or other similar system, such particulars as may be sufficient to identify the Debentures so selected; and 

  

	(d)	in all cases, the principal amounts of such Debentures or, if any such Debenture is to be redeemed in part only, the principal amount of such part. 

  
 In the event that all Debentures to be redeemed are registered Debentures, publication shall
not be required. 
  

	4.4	Debentures Due on Redemption Dates 

  
 Provided that a Redemption Notice has been provided to Debentureholders in accordance with Section 4.3, all the Debentures so called for redemption shall
thereupon be and become due and payable at the Redemption Price, together with accrued interest to but excluding the Redemption Date, on the Redemption Date specified in such notice, in the same manner and with the same effect as if it were the date
of maturity specified in such Debentures, anything therein or herein to the contrary notwithstanding, and from and after such Redemption Date, if the monies necessary to redeem such Debentures shall have been deposited as provided in Section 4.5 and
affidavits or other proof satisfactory to the Debenture Trustee as to the publication and/or mailing of such notices shall have been lodged with it, interest upon the Debentures shall cease. If any question shall arise as to whether any notice has
been given as above provided and such deposit made, such question shall be decided by the Debenture Trustee whose decision shall be final and binding upon all parties in interest. 
  

	4.5	Deposit of Redemption Monies 

  
 Redemption of Debentures shall be provided for by the Corporation depositing with the Debenture Trustee or any paying agent to the order of the Debenture
Trustee, on or before 11:00 a.m. Calgary time on the Business Day immediately prior to the Redemption Date specified in such notice, such sums of money as may be sufficient to pay the Redemption Price of the Debentures so called for redemption, plus
accrued and unpaid interest thereon up to but excluding the Redemption Date. The Corporation shall also deposit with the Debenture Trustee a sum of money sufficient to pay any charges or expenses that may be incurred by the Debenture Trustee in
connection with such redemption. Every such deposit shall be irrevocable. From the sums so deposited the Debenture Trustee shall pay or cause to be paid to the holders of such Debentures so called for redemption, upon surrender of such Debentures,
the principal, premium (if any) and interest (if any) to which they are respectively entitled on redemption. 
  

	4.6	Failure to Surrender Debentures Called for Redemption 

  
 In the event that the Debentures are held in fully registered (non-book entry) form and a holder of a Debenture so called for redemption shall fail on or
before the Redemption Date so to surrender such holder’s Debenture, or shall not within such time accept payment of the redemption monies payable, or give such receipt therefor, if any, as the Debenture Trustee may require, such redemption
monies may be set aside in trust without interest, either in the deposit department of the Debenture Trustee or in a chartered bank, and such setting aside shall for all purposes be deemed a payment to the Debentureholder of the sum so set aside
and, to that extent, the Debenture shall thereafter not be considered as outstanding hereunder and the Debentureholder shall have no other right except to receive payment out of the monies so paid and deposited, upon surrender and delivery up of
such holder’s Debenture of the Redemption Price, as the case may be, of such Debenture plus any accrued but unpaid interest thereon to, but excluding the Redemption Date. In the event that any money required to be deposited hereunder with the
Debenture Trustee or any depository or paying agent on account of principal, premium, if any, or interest, if any, on Debentures issued hereunder shall remain so deposited for a period of six years from the Redemption Date, then such monies shall at
the end of such period be paid over by the Debenture Trustee or such depository or paying agent to the Corporation on its demand, and thereupon the Debenture Trustee shall not be responsible to Debentureholders for any amounts owing to them and
subject to applicable law, thereafter the holder of a Debenture in respect of which such money was so repaid to the Corporation shall have no rights in respect thereof except to obtain payment of the money due from the Corporation, subject to any
limitation period provided by the laws of Alberta. Notwithstanding the foregoing, the Debenture Trustee will pay any remaining funds prior to the expiry of six years after the Redemption Date to the Corporation upon receipt from the Corporation, or
one of its 

  

 25 

 
Subsidiaries, of an unconditional letter of credit from a Schedule A Canadian chartered bank in an amount equal to or in excess of the amount of the
remaining funds. If the remaining funds are paid to the Corporation prior to the expiry of six years after the Redemption Date, the Corporation shall reimburse the Debenture Trustee for any amounts required to be paid by the Debenture Trustee to a
holder of a Debenture pursuant to the redemption after the date of such payment of the remaining funds to the Corporation but prior to six years after the redemption. 
  

	4.7	Cancellation of Debentures Redeemed 

  
 Subject to the provisions of Section 4.2 as to Debentures redeemed or purchased in part, all Debentures redeemed and paid under this Article 4 shall
forthwith be delivered to the Debenture Trustee and cancelled and no Debentures shall be issued in substitution therefor. 
  

	4.8	Purchase of Debentures by the Corporation 

  
 Unless otherwise specifically provided with respect to a particular series of Debentures, the Corporation may, if it is not at the time in default
hereunder, at any time and from time to time, at its option, purchase Debentures in the market (which shall include purchases from or through an investment dealer or a firm holding membership on a recognized stock exchange) or by tender or by
contract, at any price. All Debentures so purchased may, at the option of the Corporation, be delivered to the Debenture Trustee and shall be cancelled and no Debentures shall be issued in substitution therefor. 
  
 If, upon an invitation for tenders, more Debentures are tendered at the same
lowest price that the Corporation is prepared to accept, the Debentures to be purchased by the Corporation shall be selected by the Debenture Trustee on a pro rata basis or in such other manner (which may include selection by lot, random
selection by computer or any other method) consented to by the Toronto Stock Exchange which the Debenture Trustee considers appropriate, from the Debentures tendered by each tendering Debentureholder who tendered at such lowest price. For this
purpose the Debenture Trustee may make, and from time to time amend, regulations with respect to the manner in which Debentures may be so selected, and regulations so made shall be valid and binding upon all Debentureholders, notwithstanding the
fact that as a result thereof one or more of such Debentures become subject to purchase in part only. The holder of a Debenture of which a part only is purchased, upon surrender of such Debenture for payment, shall be entitled to receive, without
expense to such holder, one or more new Debentures for the unpurchased part so surrendered, and the Debenture Trustee shall certify and deliver such new Debenture or Debentures upon receipt of the Debenture so surrendered or, with respect to a
Global Debenture, the Depository shall make notations on the Global Debenture of the principal amount thereof so purchased. 
  
 ARTICLE 5 
 SUBORDINATION OF
DEBENTURES 
  

	5.1	Applicability of Article 

  
 The indebtedness, liabilities and obligations of the Corporation hereunder (except as provided in Section 14.15) or under the Debentures, whether on
account of principal, interest or otherwise, but excluding the issuance of Common Shares or other securities similar in nature thereto upon any conversion pursuant to Article 6, upon any redemption pursuant to Article 4, or at maturity pursuant to
Article 4 (collectively, the “Debenture Liabilities”), shall be subordinated and postponed and subject in right of payment, to the extent and in the manner hereinafter set forth in the following sections of this Article 5, to the
full and final payment of all Senior Indebtedness of the Corporation and each holder of any such Debenture by his acceptance thereof agrees to and shall be bound by the provisions of this Article 5. 
  

	5.2	Order of Payment 

  
 In the event of any dissolution, winding-up, liquidation, bankruptcy, insolvency, receivership, creditor enforcement or realization or other similar
proceedings relating to the Corporation or any of its property (whether voluntary or involuntary, partial or complete) or any other marshalling of the assets and liabilities of the Corporation or any sale of all or substantially all of the assets of
the Corporation: 
  

	(a)	all Senior Indebtedness shall first be paid in full, or provision made for such payment, before any payment is made on account of Debenture Liabilities; 

  

 26 

	(b)	any payment or distribution of assets of the Corporation, whether in cash, property or securities, to which the holders of the Debentures or the Debenture Trustee on behalf of such
holders would be entitled except for the provisions of this Article 5, shall be paid or delivered by the trustee in bankruptcy, receiver, assignee for the benefit of creditors, or other liquidating agent making such payment or distribution, directly
to the holders of Senior Indebtedness or their representative or representatives, or to the trustee or trustees under any indenture pursuant to which any instruments evidencing any of such Senior Indebtedness may have been issued, to the extent
necessary to pay all Senior Indebtedness in full after giving effect to any concurrent payment or distribution, or provision therefor, to the holders of such Senior Indebtedness; and 

  

	(c)	the Senior Creditors or a receiver or a receiver-manager of the Corporation or of all or part of its assets or any other enforcement agent may sell, mortgage, or otherwise dispose
of the Corporation assets in whole or in part, free and clear of all Debenture Liabilities and without the approval of the Debentureholders or the Debenture Trustee or any requirement to account to the Debenture Trustee or the Debentureholders.

  
 The rights and priority of the Senior
Indebtedness and the subordination pursuant hereto shall not be affected by : 
  

	 	(i)	the time, sequence or order of creating, granting, executing, delivering of, or registering, perfecting or failing to register or perfect any security notice, caveat, financing
statement or other notice in respect of the Senior Security; 

  

	 	(ii)	the time or order of the attachment, perfection or crystallization of any security constituted by the Senior Security; 

  

	 	(iii)	the taking of any collection, enforcement or realization proceedings pursuant to the Senior Security; 

  

	 	(iv)	the date of obtaining of any judgment or order of any bankruptcy court or any court administering bankruptcy, insolvency or similar proceedings as to the entitlement of the Senior
Creditors, or any of them or the Debentureholders or other Trustee or any of them to any money or property of the Corporation; 

  

	 	(v)	the failure to exercise any power or remedy reserved to the Senior Creditors under the Senior Security or to insist upon a strict compliance with any terms thereof;

  

	 	(vi)	whether any Senior Security is now perfected, hereafter ceases to be perfected, is avoidable by any trustee in bankruptcy or like official or is otherwise set aside, invalidated or
lapses; 

  

	 	(vii)	the date of giving or failing to give notice to or making demand upon the Corporation; or 

  

	 	(viii)	any other matter whatsoever. 

  

	5.3	Subrogation to Rights of Holders of Senior Indebtedness 

  

	(a)	 Subject to the prior payment in full of all Senior Indebtedness, the holders of the Debentures shall be subrogated to the rights of the holders of Senior
Indebtedness to receive payments or distributions of assets of the Corporation to the extent of the application thereto of such payments or other assets which would have been received by the holders of the Debentures but for the provisions hereof
until the principal of and interest on the Debentures shall be paid in full, and no such payments or distributions to the holders of the Debentures of cash, property or securities, which otherwise would be payable or distributable to the holders of
the Senior Indebtedness, shall, as between the Corporation, its creditors other than the holders of Senior 

  

 27 

	 	 
Indebtedness, and the holders of Debentures, be deemed to be a payment by the Corporation to the holders of the Senior Indebtedness or on account of the
Senior Indebtedness, it being understood that the provisions of this Article 5 are and are intended solely for the purpose of defining the relative rights of the holders of the Debentures, on the one hand, and the holders of Senior Indebtedness, on
the other hand. 

  

	(b)	The Debenture Trustee, for itself and on behalf of each of the Debentureholders, hereby waives any and all rights to require a Senior Creditor to pursue or exhaust any rights or
remedies with respect to the Corporation or any property and assets subject to the Senior Security or in any other manner to require the marshalling of property, assets or security in connection with the exercise by the Senior Creditors of any
rights, remedies or recourses available to them. 

  

	5.4	Obligation to Pay Not Impaired 

  
 Nothing contained in this Article 5 or elsewhere in this Indenture or in the Debentures is intended to or shall impair, as between the Corporation, its
creditors other than the holders of Senior Indebtedness, and the holders of the Debentures, the obligation of the Corporation, which is absolute and unconditional, to pay to the holders of the Debentures the principal of and interest on the
Debentures, as and when the same shall become due and payable in accordance with their terms, or affect the relative rights of the holders of the Debentures and creditors of the Corporation other than the holders of the Senior Indebtedness, nor
shall anything herein or therein prevent the Debenture Trustee or the holder of any Debenture from exercising all remedies otherwise permitted by applicable law upon default under this Indenture, subject to the rights, if any, under this Article 5
of the holders of Senior Indebtedness. 
  

	5.5	No Payment if Senior Indebtedness in Default 

  
 Upon the maturity of any Senior Indebtedness by lapse of time, acceleration or otherwise, or any other enforcement of any Senior Indebtedness, then all
such Senior Indebtedness shall first be paid in full, or shall first have been duly provided for, before any payment is made on account of the Debenture Liabilities. 
  
 In case of default with respect to any Senior Indebtedness permitting a Senior Creditor to demand payment or accelerate the
maturity thereof, unless and until such default shall have been cured or waived or shall have ceased to exist, no payment (by purchase of Debentures or otherwise) shall be made by the Corporation with respect to the Debenture Liabilities and neither
the Debenture Trustee nor the holders of Debentures shall be entitled to demand, institute proceedings for the collection of, or receive any payment or benefit (including without limitation by set-off, combination of accounts or otherwise in any
manner whatsoever) on account of indebtedness represented by the Debentures (a) in a manner inconsistent with the terms (as they exist on the date of issue) of the Debentures or (b) at any time when an event of default has occurred under the Senior
Indebtedness and is continuing and the notice of such event of default has been given by or on behalf of the holders of Senior Indebtedness to the Corporation, unless the Senior Indebtedness has been repaid in full. 
  
 The fact that any payment hereunder is prohibited by this Section 5.5 shall
not prevent the failure to make such payment from being an Event of Default hereunder. 
  

	5.6	Payment on Debentures Permitted 

  
 Nothing contained in this Article 5 or elsewhere in this Indenture, or in any of the Debentures, shall affect the obligation of the Corporation to make,
or prevent the Corporation from making, at any time except as prohibited by Section 5.5, any payment of principal of or interest on the Debentures. The fact that any such payment is prohibited by Section 5.5 shall not prevent the failure to make
such payment from being an Event of Default hereunder. Nothing contained in this Article 5 or elsewhere in this Indenture, or in any of the Debentures, shall prevent the conversion of the Debentures or, except as prohibited by Section 5.5, the
application by the Debenture Trustee of any monies deposited with the Debenture Trustee hereunder for the purpose, to the payment of or on account of the Debenture Liabilities. 
  

 28 

	5.7	Confirmation of Subordination 

  
 Each holder of Debentures by his acceptance thereof authorizes and directs the Debenture Trustee on his behalf to take such action as may be necessary or
appropriate to effect the subordination as provided in this Article 5 and appoints the Debenture Trustee his attorney-in-fact for any and all such purposes. Upon request of the Corporation, and upon being furnished an Officer’s Certificate
stating that one or more named persons are Senior Creditors and specifying the amount and nature of the Senior Indebtedness of such Senior Creditor, the Debenture Trustee shall enter into a written agreement or agreements with the Corporation and
the person or persons named in such Officer’s Certificate providing that such person or persons are entitled to all the rights and benefits of this Article 5 as a Senior Creditor and for such other matters, such as an agreement not to amend the
provisions of this Article 5 and the definitions used herein without the consent of such Senior Creditor, as the Senior Creditor may reasonably request. Such agreement shall be conclusive evidence that the indebtedness specified therein is Senior
Indebtedness, however, nothing herein shall impair the rights of any Senior Creditor who has not entered into such an agreement. 
  

	5.8	Knowledge of Debenture Trustee 

  
 Notwithstanding the provisions of this Article 5 or any provision in this Indenture or in the Debentures contained, the Debenture Trustee will not be
charged with knowledge of any Senior Indebtedness or of any default in the payment thereof, or of the existence of any other fact that would prohibit the making of any payment of monies to or by the Debenture Trustee, or the taking of any other
action by the Debenture Trustee, unless and until the Debenture Trustee has received written notice thereof from the Corporation, any Debentureholder or any Senior Creditor. 
  

	5.9	Debenture Trustee May Hold Senior Indebtedness 

  
 The Debenture Trustee is entitled to all the rights set forth in this Article 5 with respect to any Senior Indebtedness at the time held by it, to the
same extent as any other holder of Senior Indebtedness, and nothing in this Indenture deprives the Debenture Trustee of any of its rights as such holder. 
  

	5.10	Rights of Holders of Senior Indebtedness Not Impaired 

  
 No right of any present or future holder of any Senior Indebtedness to enforce the subordination herein will at any time or in any way be prejudiced or
impaired by any act or failure to act on the part of the Corporation or by any non-compliance by the Corporation with the terms, provisions and covenants of this Indenture, regardless of any knowledge thereof which any such holder may have or be
otherwise charged with. 
  

	5.11	Altering the Senior Indebtedness 

  
 The holders of the Senior Indebtedness have the right to extend, renew, modify or amend the terms of the Senior Indebtedness or any security therefor and
to release, sell or exchange such security and otherwise to deal freely with the Corporation, all without notice to or consent of the Debentureholders or the Debenture Trustee and without affecting the liabilities and obligations of the parties to
this Indenture or the Debentureholders or the Debenture Trustee. 
  

	5.12	Additional Indebtedness 

  
 This Indenture does not restrict the Corporation from incurring additional indebtedness for borrowed money or otherwise or mortgaging, pledging or
charging its properties to secure any indebtedness. 
  

	5.13	Right of Debentureholder to Convert Not Impaired 

  
 The subordination of the Debentures to the Senior Indebtedness and the provisions of this Article 5 do not impair in any way the right of a
Debentureholder to convert its Debentures pursuant to Article 6. 
  

 29 

	5.14	Invalidated Payments 

  
 In the event that any of the Senior Indebtedness shall be paid in full and subsequently, for whatever reason, such formerly paid or satisfied Senior
Indebtedness becomes unpaid or unsatisfied, the terms and conditions of this Article 5 shall be reinstated and the provisions of this Article shall again be operative until all Senior Indebtedness is repaid in full, provided that such reinstatement
shall not give the Senior Creditors any rights or recourses against the Debenture Trustee or the Debentureholders for amounts paid to the Debentureholders subsequent to such payment or satisfaction in full and prior to such reinstatement.

  

	5.15	Contesting Security 

  
 The Debenture Trustee, for itself and on behalf of the Debentureholders, agrees that it shall not contest or bring into question the validity, perfection
or enforceability of any of the Senior Security, or the relative priority of the Senior Security. 
  
 ARTICLE 6 
 CONVERSION OF DEBENTURES 
  

	6.1	Applicability of Article 

  
 Any Debentures issued hereunder of any series which by their terms are convertible (subject, however, to any applicable restriction of the conversion of
Debentures of such series) will be convertible into Common Shares or other securities, at such conversion rate or rates, and on such date or dates and in accordance with such other provisions as shall have been determined at the time of issue of
such Debentures and shall have been expressed in this Indenture, in such Debentures, in an Officer’s Certificate, or in a supplemental indenture authorizing or providing for the issue thereof. 
  
 Such right of conversion shall extend only to the maximum number of whole
Common Shares into which the aggregate principal amount of the Debenture or Debentures surrendered for conversion at any one time by the holder thereof may be converted. Fractional interests in Common Shares shall be adjusted for in the manner
provided in Section 6.6. 
  

	6.2	Notice of Expiry of Conversion Privilege 

  
 Notice of the expiry of the conversion privileges of the Debentures shall be given by or on behalf of the Corporation, not more than 60 days and not less
than 30 days prior to the date fixed for the Time of Expiry, in the manner provided in Section 13.2. 
  

	6.3	Revival of Right to Convert 

  
 If the redemption of any Debenture called for redemption by the Corporation is not made or the payment of the purchase price of any Debenture which has
been tendered in acceptance of an offer by the Corporation to purchase Debentures for cancellation is not made, in the case of a redemption upon due surrender of such Debenture or in the case of a purchase on the date on which such purchase is
required to be made, as the case may be, then, provided the Time of Expiry has not passed, the right to convert such Debentures shall revive and continue as if such Debenture had not been called for redemption or tendered in acceptance of the
Corporation’s offer, respectively. 
  

	6.4	Manner of Exercise of Right to Convert 

  

	(a)	 The holder of a Debenture desiring to convert such Debenture in whole or in part into Common Shares (or the Depository in the case of an instruction by a Beneficial
Holder through one or more Depository Participants concerning the exercise of its conversion right) shall surrender such Debenture to the Debenture Trustee at its principal office in the City of Calgary together with a conversion notice in the form
attached to the Debenture or any other written notice in a form satisfactory to the Debenture Trustee, 

  

 30 

	 	 
in either case duly executed by the holder or his executors or administrators or other legal representatives or his or their attorney duly appointed by an
instrument in writing in form and executed in a manner satisfactory to the Debenture Trustee, exercising his right to convert such Debenture in accordance with the provisions of this Article; provided that with respect to a Global Debenture, the
obligation to surrender a Debenture to the Debenture Trustee shall be satisfied if the Debenture Trustee makes notation on the Global Debenture of the principal amount thereof so converted and the Debenture Trustee is provided with all other
documentation which it may request. Thereupon such Debentureholder or, subject to payment of all applicable stamp or security transfer taxes or other governmental charges and compliance with all reasonable requirements of the Debenture Trustee, his
nominee(s) or assignee(s) shall be entitled to be entered in the books of the Corporation as at the Date of Conversion (or such later date as is specified in Section 6.4(b)) as the holder of the number of Common Shares into which such Debenture is
convertible in accordance with the provisions of this Article and, as soon as practicable thereafter, the Corporation shall deliver to such Debentureholder or, subject as aforesaid, his nominee(s) or assignee(s), a certificate or certificates for
such Common Shares and make or cause to be made any payment of interest to which such holder is entitled in accordance with Section 6.4(e) hereof. 

  

	(b)	For the purposes of this Article, a Debenture shall be deemed to be surrendered for conversion on the date (herein called the “Date of Conversion”) on which it is
so surrendered in accordance with the provisions of this Article or, in the case of a Global Debenture on the date on which the Debenture Trustee received notice of and all necessary documentation in respect of the exercise of the conversion rights
and, in the case of a Debenture so surrendered by post or other means of transmission, on the date on which it is received by the Debenture Trustee at one of its offices specified in Section 6.4(a); provided that if a Debenture is surrendered for
conversion on a day on which the register of Common Shares is closed, the person or persons entitled to receive Common Shares shall become the holder or holders of record of such Common Shares as at the date on which such register is next reopened.

  

	(c)	Any part, being US$1,000 or an integral multiple thereof, of a Debenture in a denomination in excess of US$1,000 may be converted as provided in this Article and all references in
this Indenture to conversion of Debentures shall be deemed to include conversion of such part. 

  

	(d)	The holder of any Debenture of which only a part is converted shall, upon the exercise of his right of conversion surrender such Debenture to the Debenture Trustee, and the
Debenture Trustee shall cancel the same and shall without charge forthwith certify and deliver to the holder a new Debenture or Debentures in an aggregate principal amount equal to the unconverted part of the principal amount of the Debenture so
surrendered or, with respect to a Global Debenture, the Depository shall make notations on the Global Debentures of the principal amount thereof so converted. 

  

	(e)	The holder of a Debenture surrendered for conversion in accordance with this Section 6.4 shall be entitled (subject to any applicable restriction on the right to receive interest on
conversion of Debentures of any series) to receive accrued and unpaid interest in respect thereof up to but excluding the Date of Conversion and the Common Shares issued upon such conversion shall rank only in respect of distributions or dividends
declared in favour of holders of Common Shares of record on and after the Date of Conversion or such later date as such holder shall become the holder of record of such Common Shares pursuant to Section 6.4(b), from which applicable date they will
for all purposes be and be deemed to be issued and outstanding as fully paid and non-assessable Common Shares. 

  

	(f)	Upon conversion of any Debentures held in book-entry only form, the Depository shall make notations in the Global Debenture of the principal amount of Debentures so converted, which
notation shall be authenticated by the Debenture Trustee, and the Corporation and the Debenture Trustee shall cause to be deposited with the Depository the shares into which such Debentures have been converted 

  

 31 

	6.5	Adjustment of Conversion Price 

  
 The Conversion Price in effect at any date shall be subject to adjustment from time to time as set forth below. 
  

	(a)	If and whenever at any time prior to the Time of Expiry the Corporation shall (i) subdivide or redivide the outstanding Common Shares into a greater number of Common Shares, (ii)
reduce, combine or consolidate the outstanding Common Shares into a smaller number of Common Shares, or (iii) issue Common Shares to the holders of all or substantially all of the outstanding Common Shares by way of a dividend or distribution (other
than the issue of Common Shares to holders of Common Shares who have elected to receive dividends or distributions in the form of Common Shares in lieu of cash dividends or cash distributions paid in the ordinary course on the Common Shares), the
Conversion Price in effect on the effective date of such subdivision, redivision, reduction, combination or consolidation or on the record date for such issue of Common Shares by way of a dividend or distribution, as the case may be, shall in the
case of any of the events referred to in (i) and (iii) above be decreased in proportion to the number of outstanding Common Shares resulting from such subdivision, redivision or dividend, or shall, in the case of any of the events referred to in
(ii) above, be increased in proportion to the number of outstanding Common Shares resulting from such reduction, combination or consolidation. Such adjustment shall be made successively whenever any event referred to in this Section 6.5(a) shall
occur. Any such issue of Common Shares by way of a dividend or distribution shall be deemed to have been made on the record date for the dividend or distribution for the purpose of calculating the number of outstanding Common Shares under
subsections (b) and (c) of this Section 6.5. 

  

	(b)	If and whenever at any time prior to the Time of Expiry the Corporation shall fix a record date for the issuance of options, rights or warrants to all or substantially all the
holders of its outstanding Common Shares entitling them, for a period expiring not more than 60 days after such record date, to subscribe for or purchase Common Shares (or securities convertible into Common Shares) at a U.S. Currency Equivalent
price per share (or having a US Currency Equivalent conversion or exchange price per share) less than 95% of the U.S. Currency Equivalent Current Market Price of a Common Share on such record date, the Conversion Price shall be adjusted immediately
after such record date so that it shall equal the price determined by multiplying the Conversion Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date
plus a number of Common Shares equal to the quotient obtained by dividing the aggregate U.S. Currency Equivalent price of the total number of additional Common Shares offered for subscription or purchase (or the aggregate conversion or exchange
price of the convertible securities so offered) by the U.S. Currency Equivalent of such Current Market Price per Common Share, and of which the denominator shall be the total number of Common Shares outstanding on such record date plus the total
number of additional Common Shares offered for subscription or purchase (or into which the convertible securities so offered are convertible). Such adjustment shall be made successively whenever such a record date is fixed. To the extent that any
such options, rights or warrants are not so issued or any such options, rights or warrants are not exercised prior to the expiration thereof, the Conversion Price shall be re-adjusted to the Conversion Price which would then be in effect if such
record date had not been fixed or to the Conversion Price which would then be in effect based upon the number of Common Shares (or securities convertible into Common Shares) actually issued upon the exercise of such options, rights or warrants, as
the case may be. 

  

	(c)	 If and whenever at any time prior to the Time of Expiry the Corporation shall fix a record date for the making of a distribution to all or substantially all the
holders of its outstanding Common Shares of (i) shares of any class other than shares and other than Common Shares distributed to holders of Common Shares who have elected to receive dividends or distributions in the form of such Common Shares in
lieu of dividends or distributions paid in the ordinary course, (ii) rights, options or warrants (excluding rights, options or warrants entitling the holders thereof for a period of not more than 60 days to subscribe for or purchase Common Shares or
securities convertible into Common Shares), (iii) evidences of its indebtedness, or (iv) assets (excluding dividends or distributions paid in the ordinary course) then, in each such case, the Conversion Price shall be adjusted immediately after such
record date so that it shall equal the price determined by multiplying the Conversion Price in effect on such record date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date multiplied by
the U.S. Currency Equivalent of the Current Market Price per Common Share on such record date, less the U.S. Currency Equivalent of the fair market value (as determined by an independent firm of chartered accountants acceptable to the Debenture
Trustee and the Corporation, which determination shall be conclusive) of such shares or rights, options or warrants or evidences or indebtedness or assets so distributed, and of which the denominator shall be the total number of Common Shares
outstanding on such 

  

 32 

	 	 
record date multiplied by the U.S. Currency Equivalent of such Current Market Price per Common Share. Such adjustment shall be made successively whenever
such a record date is fixed. To the extent that such distribution is not so made, the Conversion Price shall be re-adjusted to the Conversion Price which would then be in effect if such record date had not been fixed or to the Conversion Price which
would then be in effect based upon such shares or rights, options or warrants or evidences of indebtedness or assets actually distributed, as the case may be. 

  

	(d)	If and whenever at any time prior to the Time of Expiry, there is a reclassification of the Common Shares or a capital reorganization of the Corporation other than as described in
Section 6.5(a) or a consolidation, amalgamation, arrangement or merger of the Corporation with or into any other Person or other entity; or a sale or conveyance of the property and assets of the Corporation as an entirety or substantially as an
entirety to any other Person or other entity or a liquidation, dissolution or winding-up of the Corporation, any holder of a Debenture who has not exercised its right of conversion prior to the effective date of such reclassification, capital
reorganization, consolidation, amalgamation, arrangement or merger, sale or conveyance or liquidation, dissolution or winding-up, upon the exercise of such right thereafter, shall be entitled to receive and shall accept, in lieu of the number of
Common Shares then sought to be acquired by it, the number of shares or other securities or property of the Corporation or of the Person or other entity resulting from such merger, amalgamation or consolidation, or to which such sale or conveyance
may be made or which holders of Common Shares receive pursuant to such liquidation, dissolution or winding-up, as the case may be, that such holder of a Debenture would have been entitled to receive on such reclassification, capital reorganization,
consolidation, amalgamation, arrangement or merger, sale or conveyance or liquidation, dissolution or winding-up, if, on the record date or the effective date thereof, as the case may be, the holder had been the registered holder of the number of
Common Shares sought to be acquired by it and to which it was entitled to acquire upon the exercise of the conversion right. If determined appropriate by the directors of the Corporation, to give effect to or to evidence the provisions of this
Section 6.5(d), the Corporation, its successor, or such purchasing Person or other entity, as the case may be, shall, prior to or contemporaneously with any such reclassification, capital reorganization, consolidation, amalgamation, arrangement,
merger, sale or conveyance or liquidation, dissolution or winding-up, enter into an indenture which shall provide, to the extent possible, for the application of the provisions set forth in this Indenture with respect to the rights and interests
thereafter of the holder of Debentures to the end that the provisions set forth in this Indenture shall thereafter correspondingly be made applicable, as nearly as may reasonably be, with respect to any shares or other securities or property to
which a holder of Debentures is entitled on the exercise of its acquisition rights thereafter. Any indenture entered into between the Corporation and the Debenture Trustee pursuant to the provisions of this Section 6.5(d) shall be a supplemental
indenture entered into pursuant to the provisions of Article 15. Any indenture entered into between the Corporation, any successor to the Corporation or such purchasing Person or other entity and the Debenture Trustee shall provide for adjustments
which shall be as nearly equivalent as may be practicable to the adjustments provided in this Section 6.5(d) and which shall apply to successive reclassifications, capital reorganizations, amalgamations, consolidations, mergers, sales or
conveyances. Notwithstanding any other provision of this Indenture, in the event any reclassification, capital reorganization, consolidation, amalgamation, arrangement, merger, sale or conveyance, liquidation, dissolution or winding-up or other
event occurs on or prior to the date which is five years and one day from the issuance of the Debentures, a holder of the Debentures who exercises the right to convert Debentures into Common Shares shall be entitled to receive only shares, other
securities or property that constitute Prescribed Securities provided that the fair market value of such Prescribed Securities shall be equal to the fair market value of any Prescribed Securities and any other type of consideration that the holder
would have been entitled to receive had such Debentures been converted into Common Shares immediately prior thereto. 

  

	(e)	 In any case in which this Section 6.5 shall require that an adjustment shall become effective immediately after a record date for an event referred to herein, the
Corporation may defer, until the occurrence of such event, issuing to the holder of any Debenture converted after such record date and before the occurrence of such event the additional Common Shares issuable upon such conversion by reason of the
adjustment required by such event before giving effect to such adjustment; provided, however, that the Corporation shall deliver to such holder an appropriate instrument evidencing such holder’s right to receive such additional Common Shares
upon the occurrence of the event requiring such adjustment and the right to 

  

 33 

	 	 
receive any distributions made on such additional Common Shares declared in favour of holders of record of Common Shares on and after the Date of Conversion
or such later date as such holder would, but for the provisions of this Section 6.5(e), have become the holder of record of such additional Common Shares pursuant to Section 6.4(b). 

  

	(f)	The adjustments provided for in this Section 6.5 are cumulative and shall apply to successive subdivisions, redivisions, reductions, combinations, consolidations, distributions,
issues or other events resulting in any adjustment under the provisions of this Section, provided that, notwithstanding any other provision of this Section, no adjustment of the Conversion Price shall be required unless such adjustment would require
an increase or decrease of at least 1% in the Conversion Price then in effect; provided however, that any adjustments which by reason of this Section 6.5(f) are not required to be made shall be carried forward and taken into account in any
subsequent adjustment. 

  

	(g)	For the purpose of calculating the number of Common Shares outstanding, Common Shares owned by or for the benefit of the Corporation shall not be counted. 

 

	(h)	In the event of any question arising with respect to the adjustments provided in this Section 6.5, such question shall be conclusively determined by a firm of chartered accountants
appointed by the Corporation and acceptable to the Debenture Trustee (who may be the auditors of the Corporation); such accountants shall have access to all necessary records of the Corporation and such determination shall be binding upon the
Corporation, the Debenture Trustee, and the Debentureholders. 

  

	(i)	In case the Corporation shall take any action affecting the Common Shares other than action described in this Section 6.5, which in the opinion of the directors of the Corporation,
would materially affect the rights of Debentureholders, the Conversion Price shall be adjusted in such manner and at such time, by action of the directors of the Corporation, subject to the prior written consent of the Toronto Stock Exchange, or
such other exchange on which the Debentures are then listed, as the directors of the Corporation, in their sole discretion may determine to be equitable in the circumstances. Failure of the directors to make such an adjustment shall be conclusive
evidence that they have determined that it is equitable to make no adjustment in the circumstances. 

  

	(j)	Subject to the prior written consent of the Toronto Stock Exchange, or such other exchange on which the Debentures are then listed, no adjustment in the Conversion Price shall be
made in respect of any event described in Sections 6.5(a), 6.5(b) or 6.5(c) other than the events described in 6.5(a)(i) or 6.5(a)(ii) if the holders of the Debentures are entitled to participate in such event on the same terms mutatis mutandis
as if they had converted their Debentures prior to the effective date or record date, as the case may be, of such event. For greater certainty, the holders of Debentures shall have no right to convert Debentures into any security that is not a
Prescribed Security. 

  

	(k)	Except as stated above in this Section 6.5, no adjustment will be made in the Conversion Price for any Debentures as a result of the issuance of Common Shares at less than the U.S.
Currency Equivalent of the Current Market Price for such Common Shares on the date of issuance or the then applicable Conversion Price. 

  

	6.6	No Requirement to Issue Fractional Common Shares 

  
 The Corporation shall not be required to issue fractional Common Shares upon the conversion of Debentures pursuant to this Article. If more than one
Debenture shall be surrendered for conversion at one time by the same holder, the number of whole Common Shares issuable upon conversion thereof shall be computed on the basis of the aggregate principal amount of such Debentures to be converted. If
any fractional interest in a Common Share would, except for the provisions of this Section, be deliverable upon the conversion of any principal amount of Debentures, the Corporation shall, in lieu of delivering any certificate representing such
fractional interest, make a cash payment to the holder of such Debenture of an amount equal to the fractional interest which would have been issuable multiplied by the U.S. Currency Equivalent of the Current Market Price. 
  

 34 

	6.7	Corporation to Reserve Common Shares 

  
 The Corporation covenants with the Debenture Trustee that it will at all times reserve and keep available out of its authorized Common Shares, solely for
the purpose of issue upon conversion of Debentures as in this Article provided, and conditionally allot to Debentureholders who may exercise their conversion rights hereunder, such number of Common Shares as shall then be issuable upon the
conversion of all outstanding Debentures. The Corporation covenants with the Debenture Trustee that all Common Shares that shall be so issuable shall be duly and validly issued as fully paid and non-assessable. 
  

	6.8	Cancellation of Converted Debentures 

  
 Subject to the provisions of Section 6.4 as to Debentures converted in part, all Debentures converted in whole or in part under the provisions of this
Article shall be forthwith delivered to and cancelled by the Debenture Trustee and no Debenture shall be issued in substitution therefor. 
  

	6.9	Certificate as to Adjustment 

  
 The Corporation shall from time to time immediately after the occurrence of any event which requires an adjustment or readjustment as provided in Section
6.5, deliver an Officer’s Certificate to the Debenture Trustee specifying the nature of the event requiring the same and the amount of the adjustment necessitated thereby and setting forth in reasonable detail the method of calculation and the
facts upon which such calculation is based, which certificate and the amount of the adjustment specified therein shall be verified by an opinion of a firm of chartered accountants appointed by the Corporation and acceptable to the Debenture Trustee
(who may be the auditors of the Corporation) and shall be conclusive and binding on all parties in interest. When so approved, the Corporation shall, except in respect of any subdivision, redivision, reduction, combination or consolidation of the
Common Shares, forthwith give notice to the Debentureholders in the manner provided in Section 13.2 specifying the event requiring such adjustment or readjustment and the results thereof, including the resulting Conversion Price; provided that, if
the Corporation has given notice otherwise therein under this Section 6.9 covering all the relevant facts in respect of such event and if the Debenture Trustee approves, no such notice need be given under this Section 6.9. 
  

	6.10	Notice of Special Matters 

  
 The Corporation covenants with the Debenture Trustee that so long as any Debenture remains outstanding, it will give notice to the Debenture Trustee, and
to the Debentureholders in the manner provided in Section 13.2, of its intention to fix a record date for any event referred to in Section 6.5(a), (b) or (c) (other than the subdivision, redivision, reduction, combination or consolidation of its
Common Shares) which may give rise to an adjustment in the Conversion Price, and, in each case, such notice shall specify the particulars of such event and the record date and the effective date for such event; provided that the Corporation shall
only be required to specify in such notice such particulars of such event as shall have been fixed and determined on the date on which such notice is given. Such notice shall be given not less than fourteen (14) days in each case prior to such
applicable record date. 
  

	6.11	Protection of Debenture Trustee 

  
 Subject to Section 14.3, the Debenture Trustee: 
  

	(a)	shall not at any time be under any duty or responsibility to any Debentureholder to determine whether any facts exist which may require any adjustment in the Conversion Price, or
with respect to the nature or extent of any such adjustment when made, or with respect to the method employed in making the same; 

  

	(b)	shall not be accountable with respect to the validity or value (or the kind or amount) of any Common Shares or of any shares or other securities or property which may at any time be
issued or delivered upon the conversion of any Debenture; 

  

 35 

	(c)	shall not be responsible for any failure of the Corporation to make any cash payment or to issue, transfer or deliver Common Shares or share certificates upon the surrender of any
Debenture for the purpose of conversion, or to comply with any of the covenants contained in this Article; and 

  

	(d)	shall be entitled to act and rely on any adjustment calculation of the directors or of the accountants of the Corporation. 

  

	6.12	Legend on Common Shares 

  
 The Corporation and Debenture Trustee shall instruct the transfer agent to place the US Legend and/or Canadian Legend, as applicable, set forth in Section
2.14, on the Common Shares issued upon conversion of Initial Debentures pursuant to this Article 6, as well as all certificates issued in exchange for or in substitution of the foregoing securities, which shall also bear the US Legend and, if issued
before March 11, 2005, the Canadian Legend, set forth in Section 2.14; provided that if the Common Shares are being sold in accordance with Rule 144 under the 1933 Act, the US Legend may be removed by delivery to the Debenture Trustee, as registrar
and transfer agent for the Common Shares, of an opinion of Counsel, of recognized standing reasonably satisfactory to the Corporation, that the US Legend is no longer required under applicable requirements of the 1933 Act or state securities laws.
Provided that the Debenture Trustee obtains confirmation from the Corporation that such Counsel is satisfactory to it, it shall be entitled to rely on such opinion of Counsel without further inquiry. 
  
 ARTICLE 7 
 COVENANTS OF THE CORPORATION 
  
 The Corporation hereby covenants and agrees with the Debenture Trustee for the benefit of the Debenture Trustee and the Debentureholders, that so long as any Debentures remain outstanding: 
  

	7.1	To Pay Principal and Interest 

  
 The Corporation will duly and punctually pay or cause to be paid to every Debentureholder the principal of, premium (if any) and interest accrued on the
Debentures of which it is the holder on the dates, at the places and in the manner mentioned herein and in the Debentures. 
  

	7.2	To Pay Debenture Trustee’s Remuneration 

  
 The Corporation will pay the Debenture Trustee reasonable remuneration for its services as Debenture Trustee hereunder and will pay or reimburse the
Debenture Trustee on demand for all expenses, disbursements and advances incurred or made by the Debenture Trustee in the administration or execution of the trusts hereby created (including the reasonable compensation and the disbursements of its
counsel and all other advisers and assistants not regularly in its employ), both before any default hereunder and thereafter until all the duties of the Debenture Trustee under the trusts hereof shall be finally and fully performed, except any such
expense, disbursement or advance as may arise from its negligence or wilful misconduct. Any amount due under this section and unpaid thirty days after request for such payment shall bear interest from the expiration of such thirty days at a rate per
annum equal to the then current rate charged by the Debenture Trustee from time to time, payable on demand. After default, all amounts so payable and the interest thereon shall be payable out of any funds coming into the possession of the Debenture
Trustee or its successors in the trusts hereunder in priority to any payment of any principal of or interest or premium on the Debentures. The said remuneration shall continue to be payable until the trusts hereof be finally wound up and whether or
not the trusts of this Indenture shall be in the course of administration by or under the direction of a court of competent jurisdiction. 
  

	7.3	To Give Notice of Default 

  
 The Corporation shall notify the Debenture Trustee immediately upon obtaining knowledge of any Event of Default hereunder. 
  

 36 

	7.4	Preservation of Existence, Status, etc. 

  
 Subject to the express provisions hereof, the Corporation will carry on and conduct its activities, and cause its Subsidiaries to carry on and conduct
their businesses, in a proper, efficient and business-like manner and in accordance with good business practices. The Corporation will also do all such things and take all such actions as are required to maintain its reporting issuer status in good
standing and to comply with the listing requirements of the Toronto Stock Exchange and/or any other exchange on which the Common Shares are listed from time to time. The Corporation shall also do all such things and take all such notices as are
reasonably required to ensure that the Common Shares continue to constitute Prescribed Securities. 
  

	7.5	Keeping of Books 

  
 The Corporation will keep or cause to be kept proper books of record and account, in which full and correct entries shall be made of all financial
transactions and the assets and business of the Corporation in accordance with generally accepted accounting principles. 
  

	7.6	Reporting Requirements 

  

	(a)	The Corporation will file with the Debenture Trustee copies of continuous disclosure documents furnished to its holders of Common Shares after the date hereof (including annual
consolidated financial statements of the Corporation and any reports of the Corporation’s auditors thereon); and 

  

	(b)	In the event that the Corporation has Global Debentures outstanding, the Corporation will file with the Depository copies of continuance disclosure documents furnished to its
holders of Common Shares. 

  

	7.7	No Distributions on Common Shares if Event of Default 

  
 The Corporation shall not declare or make any distribution to the holders of its issued and outstanding Common Shares after the occurrence of an Event of
Default unless and until such default shall have been cured or waived or shall have ceased to exist. 
  

	7.8	Performance of Covenants by Debenture Trustee 

  
 If the Corporation shall fail to perform any of its covenants contained in this Indenture, the Debenture Trustee may notify the Debentureholders of such
failure on the part of the Corporation or may itself perform any of the covenants capable of being performed by it, but shall be under no obligation to do so or to notify the Debentureholders. All sums so expended or advanced by the Debenture
Trustee shall be repayable as provided in Section 7.2. No such performance, expenditure or advance by the Debenture Trustee shall be deemed to relieve the Corporation of any default hereunder. 
  
 ARTICLE 8 
 DEFAULT 
  

	8.1	Events of Default 

  
 Each of the following events constitutes, and is herein sometimes referred to as, an “Event of Default”: 
  

	(a)	failure for 15 days to pay interest on the Debentures when due; 

  

	(b)	failure to pay principal or premium, if any, on the Debentures when due whether at maturity, upon redemption, by declaration or otherwise; 

  

	(c)	 if a decree or order of a Court having jurisdiction is entered adjudging the Corporation a bankrupt or insolvent under the Bankruptcy and Insolvency Act
(Canada) or any other bankruptcy, insolvency or 

  

 37 

	 	 
analogous laws, or issuing sequestration or process of execution against, or against any substantial part of, the property of the Corporation, or appointing
a receiver of, or of any substantial part of, the property of the Corporation or ordering the winding-up or liquidation of its affairs, and any such decree or order continues unstayed and in effect for a period equal to the lesser of (a) 60 days;
and (b) the period of time permitted by the Corporation’s then current senior credit agreement, as the same may be amended, for any such decree or order to continue unstayed and in effect prior to the occurrence of an event of default under
such senior credit agreement; 

  

	(d)	if the Corporation institutes proceedings to be adjudicated a bankrupt or insolvent, or consents to the institution of bankruptcy or insolvency proceedings against it under the
Bankruptcy and Insolvency Act (Canada) or any other bankruptcy, insolvency or analogous laws, or consents to the filing of any such petition or to the appointment of a receiver of, or of any substantial part of, the property of the
Corporation or makes a general assignment for the benefit of creditors, or admits in writing its inability to pay its debts generally as they become due; 

  

	(e)	if a resolution is passed for the winding-up or liquidation of the Corporation except in the course of carrying out or pursuant to a transaction in respect of which the conditions
of Section 10.1 are duly observed and performed; 

  

	(f)	if, after the date of this Indenture, any proceedings with respect to the Corporation are taken with respect to a compromise or arrangement, with respect to creditors of the
Corporation generally, under the applicable legislation of any jurisdiction; 

  

	(g)	the failure to make and duly consummate an Offer in the manner set forth in section 2.4(i) hereof; or 

  

	(h)	the failure to perform or observe any of the other covenants, agreements or obligations under this Indenture for 60 days after written notice from the Corporation to the Debenture
Trustee of such failure. 

  
 in each and every such event the
Debenture Trustee may, in its discretion, and shall, upon receipt of a request in writing signed by the holders of not less than 25% in principal amount of the Debentures then outstanding (or, if there are Global Debentures outstanding, a request
signed by holders of the Global Certificates on instructions of Beneficial Holders through one or more Depository Participants of not less than 25% in principal amount of Debentures then outstanding), subject to the provisions of Section 8.3, by
notice in writing to the Corporation declare the principal of and interest on all Debentures then outstanding and all other monies outstanding hereunder to be due and payable and the same shall forthwith become immediately due and payable to the
Debenture Trustee, and the Corporation shall forthwith pay to the Debenture Trustee for the benefit of the Debentureholders such principal, accrued and unpaid interest and interest on amounts in default on such Debenture (and, where such a
declaration is based upon a voluntary winding-up or liquidation of the Corporation, the premium, if any, on the Debentures then outstanding which would have been payable upon the redemption thereof by the Corporation on the date of such declaration)
and all other monies outstanding hereunder, together with subsequent interest at the rate borne by the Debentures on such principal, interest and such other monies from the date of such declaration until payment is received by the Debenture Trustee,
such subsequent interest to be payable at the times and places and in the monies mentioned in and according to the tenor of the Debentures. Such payment when made shall be deemed to have been made in discharge of the Corporation’s obligations
hereunder and any monies so received by the Debenture Trustee shall be applied in the manner provided in Section 8.6. 
  
 For greater certainty, for the purposes of this Section 8.1, a series of Debentures shall be in default in respect of an Event of Default if such Event of
Default relates to a default in the payment of principal, premium, if any, or interest on the Debentures of such series in which case references to Debentures in this Section 8.1 refer to Debentures of that particular series. 
  
 For purposes of this Article 8, where the Event of Default refers to an Event
of Default with respect to a particular series of Debentures as described in this Section 8.1, then this Article 8 shall apply mutatis mutandis to the Debentures of such series and references in this Article 8 to the Debentures shall mean
Debentures of the particular series and references to the Debentureholders shall refer to the Debentureholders of the particular series, as applicable. 
  

 38 

	8.2	Notice of Events of Default 

  
 If an Event of Default shall occur and be continuing the Debenture Trustee shall, within 30 days after it receives written notice of the occurrence of
such Event of Default, give notice of such Event of Default to the Debentureholders in the manner provided in Section 13.2, provided that notwithstanding the foregoing, unless the Debenture Trustee shall have been requested to do so by the holders
of at least 25% of the principal amount of the Debentures then outstanding (or by holders of Global Debentures on instructions of Beneficial Holders through one or more Depository Participants of not less than 25% in principal amount of Debentures
then outstanding), the Debenture Trustee shall not be required to give such notice if the Debenture Trustee in good faith shall have determined that the withholding of such notice is in the best interests of the Debentureholders and shall have so
advised the Corporation in writing. 
  

	8.3	Waiver of Default 

  
 Upon the happening of any Event of Default hereunder: 
  

	(a)	the holders of the Debentures shall have the power (in addition to the powers exercisable by Extraordinary Resolution as hereinafter provided) by requisition in writing by the
holders of more than a majority of the principal amount of Debentures then outstanding (or by holders of Global Debentures on instructions of Beneficial Holders through one or more Depository Participants of more than a majority of the principal
amount of the Debentures then outstanding), to instruct the Debenture Trustee to waive any Event of Default and to cancel any declaration made by the Debenture Trustee pursuant to Section 8.1 and the Debenture Trustee shall thereupon waive the Event
of Default and cancel such declaration, or either, upon such terms and conditions as shall be prescribed in such requisition; provided that notwithstanding the foregoing if the Event of Default has occurred by reason of the non-observance or
non-performance by the Corporation of any covenant applicable only to one or more series of Debentures, then the holders of more than a majority of the principal amount of the outstanding Debentures of that series (or by holders of Global Debentures
on instructions of Beneficial Holders of that series through one or more Depository Participants) shall be entitled to exercise the foregoing power and the Debenture Trustee shall so act and it shall not be necessary to obtain a waiver from the
holders of any other series of Debentures; and 

  

	(b)	the Debenture Trustee, so long as it has not become bound to declare the principal and interest on the Debentures then outstanding to be due and payable, or to obtain or enforce
payment of the same, shall have power to waive any Event of Default if, in the Debenture Trustee’s opinion, the same shall have been cured or adequate satisfaction made therefor, and in such event to cancel any such declaration theretofore made
by the Debenture Trustee in the exercise of its discretion, upon such terms and conditions as the Debenture Trustee may deem advisable. 

  
 No such act or omission either of the Debenture Trustee or of the Debentureholders shall extend to or be taken in any manner whatsoever to affect any
subsequent Event of Default or the rights resulting therefrom. 
  

	8.4	Enforcement by the Debenture Trustee 

  
 Subject to the provisions of Section 8.3 and to the provisions of any Extraordinary Resolution that may be passed by the Debentureholders, if the
Corporation shall fail to pay to the Debenture Trustee, forthwith after the same shall have been declared to be due and payable under Section 8.1, the principal of and premium (if any) and interest on all Debentures then outstanding, together with
any other amounts due hereunder, the Debenture Trustee may in its discretion and shall upon receipt of a request in writing signed by the holders of not less than 25% in principal amount of the Debentures then outstanding (or by holders of Global
Debentures on instructions of Beneficial Holders through one or more Depository Participants of not less than 25% in principal amount of the Debentures then outstanding) and upon being funded and indemnified to its reasonable satisfaction against
all costs, expenses and liabilities to be incurred, proceed in its name as trustee hereunder to obtain or enforce payment of such principal of and premium (if any) and interest on all the Debentures then outstanding together with any other amounts
due hereunder by such proceedings authorized by this Indenture or by law or equity as the Debenture Trustee in such request shall have been directed to take, or if such request contains no such direction, or if the 

  

 39 

 
Debenture Trustee shall act without such request, then by such proceedings authorized by this Indenture or by suit at law or in equity as the Debenture
Trustee shall deem expedient. 
  
 The Debenture Trustee shall be
entitled and empowered, either in its own name or as Debenture Trustee of an express trust, or as attorney-in-fact for the holders of the Debentures, or in any one or more of such capacities, to file such proof of debt, amendment of proof of debt,
claim, petition or other document as may be necessary or advisable in order to have the claims of the Debenture Trustee and of the holders of the Debentures allowed in any insolvency, bankruptcy, liquidation or other judicial proceedings relative to
the Corporation or its creditors or relative to or affecting its property. The Debenture Trustee is hereby irrevocably appointed (and the successive respective holders of the Debentures by taking and holding the same shall be conclusively deemed to
have so appointed the Debenture Trustee) the true and lawful attorney-in-fact of the respective holders of the Debentures with authority to make and file in the respective names of the holders of the Debentures or on behalf of the holders of the
Debentures as a class, subject to deduction from any such claims of the amounts of any claims filed by any of the holders of the Debentures themselves, any proof of debt, amendment of proof of debt, claim, petition or other document in any such
proceedings and to receive payment of any sums becoming distributable on account thereof, and to execute any such other papers and documents and to do and perform any and all such acts and things for and on behalf of such holders of the Debentures,
as may be necessary or advisable in the opinion of the Debenture Trustee, in order to have the respective claims of the Debenture Trustee and of the holders of the Debentures against the Corporation or its property allowed in any such proceeding,
and to receive payment of or on account of such claims; provided, however, that subject to Section 8.3, nothing contained in this Indenture shall be deemed to give to the Debenture Trustee, unless so authorized by Extraordinary Resolution, any right
to accept or consent to any plan of reorganization or otherwise by action of any character in such proceeding to waive or change in any way any right of any Debentureholder. 
  
 The Debenture Trustee shall also have the power at any time and from time to time to institute and to maintain such suits
and proceedings as it may be advised shall be necessary or advisable to preserve and protect its interests and the interests of the Debentureholders. 
  
 All rights of action hereunder may be enforced by the Debenture Trustee without the possession of any of the Debentures or the production thereof on the
trial or other proceedings relating thereto. Any such suit or proceeding instituted by the Debenture Trustee shall be brought in the name of the Debenture Trustee as trustee of an express trust, and any recovery of judgment shall be for the rateable
benefit of the holders of the Debentures subject to the provisions of this Indenture. In any proceeding brought by the Debenture Trustee (and also any proceeding in which a declaratory judgment of a court may be sought as to the interpretation or
construction of any provision of this Indenture, to which the Debenture Trustee shall be a party) the Debenture Trustee shall be held to represent all the holders of the Debentures, and it shall not be necessary to make any holders of the Debentures
parties to any such proceeding. 
  

	8.5	No Suits by Debentureholders 

  
 No holder of any Debenture shall have any right to institute any action, suit or proceeding at law or in equity for the purpose of enforcing payment of
the principal of or interest on the Debentures or for the execution of any trust or power hereunder or for the appointment of a liquidator or receiver or for a receiving order under the Bankruptcy and Insolvency Act (Canada) or to have the
Corporation wound up or to file or prove a claim in any liquidation or bankruptcy proceeding or for any other remedy hereunder, unless: (a) such holder shall previously have given to the Debenture Trustee written notice of the happening of an Event
of Default hereunder; and (b) the Debentureholders by Extraordinary Resolution or by written instrument signed by the holders of at least 25% in principal amount of the Debentures then outstanding (or by holders of Global Debentures on instructions
of Beneficial Holders through one or more Depository Participants of not less than 25% in principal amount of the Debentures then outstanding) shall have made a request to the Debenture Trustee and the Debenture Trustee shall have been afforded
reasonable opportunity either itself to proceed to exercise the powers hereinbefore granted or to institute an action, suit or proceeding in its name for such purpose; and (c) the Debentureholders or any of them shall have furnished to the Debenture
Trustee, when so requested by the Debenture Trustee, sufficient funds and security and indemnity satisfactory to it against the costs, expenses and liabilities to be incurred therein or thereby; and (d) the Debenture Trustee shall have failed to act
within a reasonable time after such notification, request and offer of indemnity and such notification, request and offer of indemnity are hereby declared in every such case, at the option 

  

 40 

 
of the Debenture Trustee, to be conditions precedent to any such proceeding or for any other remedy hereunder by or on behalf of the holder of any
Debentures. 
  

	8.6	Application of Monies by Debenture Trustee 

  

	(a)	Except as herein otherwise expressly provided, any monies received by the Debenture Trustee from the Corporation pursuant to the foregoing provisions of this Article 8, or as a
result of legal or other proceedings or from any trustee in bankruptcy or liquidator of the Corporation, shall be applied, together with any other monies in the hands of the Debenture Trustee available for such purpose, as follows:

  

	 	(i)	first, in payment or in reimbursement to the Debenture Trustee of its compensation, costs, charges, expenses, borrowings, advances or other monies furnished or provided by or at the
instance of the Debenture Trustee in or about the execution of its trusts under, or otherwise in relation to, this Indenture, with interest thereon as herein provided; 

  

	 	(ii)	second, but subject as hereinafter in this Section 8.6 provided, in payment, rateably and proportionately to the holders of Debentures, of the principal of and premium (if any) and
accrued and unpaid interest and interest on amounts in default on the Debentures which shall then be outstanding in the priority of principal first and then premium and then accrued and unpaid interest and interest on amounts in default unless
otherwise directed by Extraordinary Resolution and in that case in such order or priority as between principal, premium (if any) and interest as may be directed by such resolution; and 

  

	 	(iii)	third, in payment of the surplus, if any, of such monies to the Corporation or its assigns; 

  
 provided, however, that no payment shall be made pursuant to clause (ii) above in respect of the principal, premium or
interest on any Debenture held, directly or indirectly, by or for the benefit of the Corporation or any Subsidiary (other than any Debenture pledged for value and in good faith to a person other than the Corporation or any Subsidiary but only to the
extent of such person’s interest therein) except subject to the prior payment in full of the principal, premium (if any) and interest (if any) on all Debentures which are not so held. 
  

	(b)	The Debenture Trustee shall not be bound to apply or make any partial or interim payment of any monies coming into its hands if the amount so received by it, after reserving
thereout such amount as the Debenture Trustee may think necessary to provide for the payments mentioned in Section 8.6(a), is insufficient to make a distribution of at least 2% of the aggregate principal amount of the outstanding Debentures, but it
may retain the money so received by it and invest or deposit the same as provided in Section 14.9 until the money or the investments representing the same, with the income derived therefrom, together with any other monies for the time being under
its control shall be sufficient for the said purpose or until it shall consider it advisable to apply the same in the manner hereinbefore set forth. The foregoing shall, however, not apply to a final payment in distribution hereunder.

  

	8.7	Notice of Payment by Debenture Trustee 

  
 Not less than 15 days notice shall be given in the manner provided in Section 13.2 by the Debenture Trustee to the Debentureholders of any payment to be
made under this Article 8. Such notice shall state the time when and place where such payment is to be made and also the liability under this Indenture to which it is to be applied. After the day so fixed, unless payment shall have been duly
demanded and have been refused, the Debentureholders will be entitled to interest only on the balance (if any) of the principal monies, premium (if any) and interest due (if any) to them, respectively, on the Debentures, after deduction of the
respective amounts payable in respect thereof on the day so fixed. 
  

 41 

	8.8	Debenture Trustee May Demand Production of Debentures 

  
 The Debenture Trustee shall have the right to demand production of the Debentures in respect of which any payment of principal, interest or premium
required by this Article 8 is made and may cause to be endorsed on the same a memorandum of the amount so paid and the date of payment, but the Debenture Trustee may, in its discretion, dispense with such production and endorsement, upon such
indemnity being given to it and to the Corporation as the Debenture Trustee shall deem sufficient. 
  

	8.9	Remedies Cumulative 

  
 No remedy herein conferred upon or reserved to the Debenture Trustee, or upon or to the holders of Debentures is intended to be exclusive of any other
remedy, but each and every such remedy shall be cumulative and shall be in addition to every other remedy given hereunder or now existing or hereafter to exist by law or by statute. 
  

	8.10	Judgment Against the Corporation 

  
 The Corporation covenants and agrees with the Debenture Trustee that, in case of any judicial or other proceedings to enforce the rights of the
Debentureholders, judgment may be rendered against it in favour of the Debentureholders or in favour of the Debenture Trustee, as trustee for the Debentureholders, for any amount which may remain due in respect of the Debentures and premium (if any)
and the interest thereon and any other monies owing hereunder. 
  

	8.11	Immunity of Debenture Trustee and Others 

  
 The Debentureholders and the Debenture Trustee hereby waive and release any right, cause of action or remedy now or hereafter existing in any jurisdiction
against any past, present or future officer or director of the Corporation or holder of Common Shares of the Corporation or of any successor for the payment of the principal of or premium or interest on any of the Debentures or on any covenant,
agreement, representation or warranty by the Corporation herein or in the Debentures contained. 
  
 ARTICLE 9 
 SATISFACTION AND DISCHARGE 
  

	9.1	Cancellation and Destruction 

  
 All Debentures shall, forthwith after payment in full thereof, be delivered to the Debenture Trustee for cancellation. All Debentures cancelled or
required to be cancelled under this or any other provision of this Indenture shall be destroyed by the Debenture Trustee and, if required by the Corporation, the Debenture Trustee shall furnish to it a destruction certificate setting out the
designating numbers of the Debentures so destroyed. 
  

	9.2	Non-Presentation of Debentures 

  
 In case the holder of any Debenture shall fail to present the same for payment on the date on which the principal, premium (if any) or the interest
thereon or represented thereby becomes payable either at maturity or otherwise or shall not accept payment on account thereof and give such receipt therefor, if any, as the Debenture Trustee may require: 
  

	(a)	the Corporation shall be entitled to pay or deliver to the Debenture Trustee and direct it to set aside; or 

  

	(b)	in respect of monies in the hands of the Debenture Trustee which may or should be applied to the payment of the Debentures, the Corporation shall be entitled to direct the Debenture
Trustee to set aside; or 

  

	(c)	if the redemption was pursuant to notice given by the Debenture Trustee, the Debenture Trustee may itself set aside; 

  

 42 

 the principal, premium (if any) or the interest, as the case may be, in trust to be paid to the holder of such Debenture
upon due presentation or surrender thereof in accordance with the provisions of this Indenture; and thereupon the principal, premium (if any) or the interest payable on or represented by each Debenture in respect whereof such monies have been set
aside shall be deemed to have been paid and the holder thereof shall thereafter have no right in respect thereof except that of receiving payment of the monies so set aside by the Debenture Trustee upon due presentation and surrender thereof,
subject always to the provisions of Section 9.3. 
  

	9.3	Repayment of Unclaimed Monies 

  
 Subject to applicable law, any monies set aside under Section 9.2 and not claimed by and paid to holders of Debentures as provided in Section 9.2 within
six years after the date of such setting aside shall be repaid to the Corporation by the Debenture Trustee and thereupon the Debenture Trustee shall be released from all further liability with respect to such monies and thereafter the holders of the
Debentures in respect of which such monies were so repaid to the Corporation shall have no rights in respect thereof except to obtain payment and delivery of the monies from the Corporation subject to any limitation provided by the laws of the
Province of Alberta. Notwithstanding the foregoing, the Debenture Trustee will pay any remaining funds prior to the expiry of six years after the setting aside described in Section 9.2 to the Corporation upon receipt from the Corporation, or one of
its Subsidiaries, of an uncontested letter of credit from a Schedule A Canadian chartered bank in an amount equal to or in excess of the amount of the remaining funds. If the remaining funds are paid to the Corporation prior to the expiry of six
years after such setting aside, the Corporation shall reimburse the Debenture Trustee for any amounts so set aside which are required to be paid by the Debenture Trustee to a holder of a Debenture after the date of such payment of the remaining
funds to the Corporation but prior to six years after such setting aside. 
  

	9.4	Discharge 

  
 The Debenture Trustee shall at the written request of the Corporation release and discharge this Indenture and execute and deliver such instruments as it
shall be advised by Counsel are requisite for that purpose and to release the Corporation from its covenants herein contained (other than the provisions relating to the indemnification of the Debenture Trustee), upon proof being given to the
reasonable satisfaction of the Debenture Trustee that the principal and premium (if any) of and interest (including interest on amounts in default, if any), on all the Debentures and all other monies payable hereunder have been paid or satisfied or
that all the Debentures having matured or having been duly called for redemption, payment of the principal of and interest (including interest on amounts in default, if any) on such Debentures and of all other monies payable hereunder has been duly
and effectually provided for in accordance with the provisions hereof. 
  

	9.5	Satisfaction 

  

	(a)	The Corporation shall be deemed to have fully paid, satisfied and discharged all of the outstanding Debentures of any series and the Debenture Trustee, at the expense of the
Corporation, shall execute and deliver proper instruments acknowledging the full payment, satisfaction and discharge of such Debentures, when, with respect to all of the outstanding Debentures or all of the outstanding Debentures of any series, as
applicable, either: 

  

	 	(i)	the Corporation has deposited or caused to be deposited with the Debenture Trustee as trust funds or property in trust for the purpose of making payment on such Debentures, an
amount in money sufficient to pay, satisfy and discharge the entire amount of principal, premium, if any, and interest, if any, to maturity or any repayment date or Redemption Dates, as the case may be, of such Debentures; or

  

	 	(ii)	the Corporation has deposited or caused to be deposited with the Debenture Trustee as trust property in trust for the purpose of making payment on such Debentures:

  

	 	(A)	if the Debentures are issued in Canadian dollars, such amount in Canadian dollars of direct obligations of, or obligations the principal and interest of which are guaranteed by, the
Government of Canada or Common Shares, if applicable; or 

  

 43 

	 	(B)	if the Debentures are issued in a currency or currency unit other than Canadian dollars, cash in the currency or currency unit in which the Debentures are payable and/or such amount
in such currency or currency unit of direct obligations of, or obligations the principal and interest of which are guaranteed by, the Government of Canada or the government that issued the currency or currency unit in which the Debentures are
payable; 

  
 as will, together with the income to
accrue thereon and reinvestment thereof, be sufficient to pay and discharge the entire amount of principal and accrued and unpaid interest to maturity or any repayment date, as the case may be, of all such Debentures; 
  
 and in either event: 
  

	 	(iii)	the Corporation has paid, caused to be paid or made provisions to the satisfaction of the Debenture Trustee for the payment of all other sums payable with respect to all of such
Debentures (together with all applicable expenses of the Debenture Trustee in connection with the payment of such Debentures); and 

  

	 	(iv)	the Corporation has delivered to the Debenture Trustee an Officer’s Certificate stating that all conditions precedent herein provided relating to the payment, satisfaction and
discharge of all such Debentures have been complied with. 

  
 Any deposits with the Debenture Trustee referred to in this Section 9.5 shall be irrevocable, subject to Section 9.6, and shall be made under the terms of an escrow and/or trust agreement in form and substance
satisfactory to the Debenture Trustee and which provides for the due and punctual payment of the principal of, and interest and premium, if any, on the Debentures being satisfied. 
  

	(b)	Upon the satisfaction of the conditions set forth in this Section 9.5 with respect to all the outstanding Debentures, or all the outstanding Debentures of any series, as applicable,
the terms and conditions of the Debentures, including the terms and conditions with respect thereto set forth in this Indenture (other than those contained in Articles 2 and 4 and the provisions of Article 1 pertaining to Articles 2 and 4) shall no
longer be binding upon or applicable to the Corporation. 

  

	(c)	Any funds or obligations deposited with the Debenture Trustee pursuant to this Section 9.5 shall be denominated in the currency or denomination of the Debentures in respect of which
such deposit is made. 

  

	(d)	If the Debenture Trustee is unable to apply any money or securities in accordance with this Section 9.5 by reason of any legal proceeding or any order or judgment of any court or
governmental authority enjoining, restraining or otherwise prohibiting such application, the Corporation’s obligations under this Indenture and the affected Debentures shall be revived and reinstated as though no money or securities had been
deposited pursuant to this Section 9.5 until such time as the Debenture Trustee is permitted to apply all such money or securities in accordance with this Section 9.5, provided that if the Corporation has made any payment in respect of principal,
premium or interest on Debentures or, as applicable, other amounts because of the reinstatement of its obligations, the Corporation shall be subrogated to the rights of the holders of such Debentures to receive such payment from the money or
securities held by the Debenture Trustee. 

  

	9.6	Continuance of Rights, Duties and Obligations 

  
 Where trust funds or trust property have been deposited pursuant to Section 9.5, the holders of Debentures and the Corporation shall continue to have and
be subject to their respective rights, duties and obligations under Articles 2 and 4. 
  

 44 

 ARTICLE 10 
 SUCCESSORS 
  

	10.1	Restrictions on Amalgamation, Merger and Sale of Certain Assets, etc. 

  

Subject to the provisions of Article 11, the Corporation shall not enter into any transaction or series of transactions whereby all or substantially
all of its undertaking, property or assets would become the property of any other Person (herein called a “Successor”) whether by way of reorganization, consolidation, amalgamation, arrangement, merger, transfer, sale or otherwise,
unless: 
  

	(a)	prior to or contemporaneously with the consummation of such transaction the Corporation and the Successor shall have executed such instruments and done such things as, in the
opinion of Counsel, are necessary or advisable to establish that upon the consummation of such transaction: 

  

	 	(i)	the Successor will have assumed all the covenants and obligations of the Corporation under this Indenture in respect of the Debentures; 

  

	 	(ii)	the Debentures will be valid and binding obligations of the Successor entitling the holders thereof, as against the Successor, to all the rights of Debentureholders under this
Indenture; and 

  

	 	(iii)	in the case of an entity organized otherwise than under the laws of the Province of Alberta, shall attorn to the jurisdiction of the courts of the Province of Alberta;

  

	(b)	such transaction, in the opinion of Counsel, shall be on such terms as to substantially preserve and not impair any of the rights and powers of the Debenture Trustee or of the
Debentureholders hereunder; and 

  

	(c)	no condition or event shall exist as to the Corporation (at the time of such transaction) or the Successor (immediately after such transaction) and after giving full effect thereto
or immediately after the Successor shall become liable to pay the principal monies, premium, if any, interest and other monies due or which may become due hereunder, which constitutes or would constitute an Event of Default hereunder.

  

	10.2	Vesting of Powers in Successor 

  
 Whenever the conditions of Section 10.1 shall have been duly observed and performed, any Successor formed by or resulting from such transaction shall
succeed to, and be substituted for, and may exercise every right and power of the Corporation under this Indenture with the same effect as though the Successor had been named as the Corporation herein and thereafter, except in the case of a lease or
other similar disposition of property to the Successor, the Corporation shall be relieved of all obligations and covenants under this Indenture and the Debentures forthwith upon the Corporation delivering to the Debenture Trustee an opinion of
Counsel to the effect that the transaction shall not result in any material adverse tax consequences to the Corporation or the Successor. The Debenture Trustee will, at the expense of the Successor, execute any documents which it may be advised by
Counsel are necessary or advisable for effecting or evidencing such release and discharge. 
  
 ARTICLE 11 
 COMPULSORY ACQUISITION 
  

	11.1	Definitions 

  
 In this Article: 
  

	(a)	“Affiliate” and “Associate” shall have their respective meanings set forth in the Securities Act (Alberta); 

  

	(b)	“Dissenting Debentureholders” means a Debentureholder who does not accept an Offer referred to in Section 11.2 and includes any assignee of the Debenture of a
Debentureholder to whom such an Offer is made, whether or not such assignee is recognized under this Indenture; 

  

 45 

	(c)	“Offer” means an offer to acquire all of the outstanding Debentures (other than Debentures held by or on behalf of the Offeror or an affiliate or Associate of the
Offeror); 

  

	(d)	“offer to acquire” includes an acceptance of an offer to sell; 

  

	(e)	“Offeror” means a person, or two or more persons acting jointly or in concert, who make an Offer to acquire Debentures; 

  

	(f)	“Offeror’s Notice” means the notice described in Section 11.3; and 

  

	(g)	“Offeror’s Debentures” means Debentures beneficially owned, or over which control or direction is exercised, on the date of an Offer by the Offeror, any
Affiliate or Associate of the Offeror or any person or company acting jointly or in concert with the Offeror. 

  

	11.2	Offer for Debentures 

  
 If an Offer is made and: 
  

	(a)	within the time provided in the Offer for its acceptance or within 45 days after the date the Offer is made, whichever period is the shorter, the Offer is accepted by
Debentureholders representing at least 90% of the outstanding principal amount of the Debentures, other than the Offeror’s Debentures; 

  

	(b)	the Offeror is unconditionally bound to take up and pay for, or has taken up and paid for the Debentures of the Debentureholders who accepted the Offer; and

  

	(c)	the Offeror complies with Sections 11.3 and 11.5; 

  
 then the Offeror is entitled to acquire, and the Dissenting Debentureholders are required to sell to the Offeror, the Debentures held by the Dissenting Debentureholders
for the same consideration per Debenture payable or paid, as the case may be, under the Offer on the terms and subject to the conditions set forth in this Article 11. 
  

	11.3	Offeror’s Notice to Dissenting Shareholders 

  
 Where an Offeror is entitled to acquire Debentures held by Dissenting Debentureholders pursuant to Section 11.2 and the Offeror wishes to exercise such
right, the Offeror shall send by registered mail within 10 days after the date of termination of the Offer a notice (the “Offeror’s Notice”) to the Debenture Trustee and to each Dissenting Debentureholder stating that:

  

	(a)	Debentureholders holding at least 90% of the principal amount of all outstanding Debentures, other than Offeror’s Debentures, have accepted the Offer; 

 

	(b)	the Offeror is unconditionally bound to take up and pay for, or has taken up and paid for, the Debentures of the Debentureholders who accepted the Offer; 

 

	(c)	Dissenting Debentureholders must transfer their respective Debentures to the Offeror on the terms on which the Offeror acquired the Debentures of the Debentureholders who accepted
the Offer within 21 days after the date of the sending of the Offeror’s Notice; and 

  

	(d)	Dissenting Debentureholders must send their respective Debenture certificate(s) to the Debenture Trustee within 21 days after the date of the sending of the Offeror’s Notice.

  

	11.4	Delivery of Debenture Certificates 

  
 A Dissenting Debentureholder to whom an Offeror’s Notice is sent pursuant to Section 11.3 shall, within 21 days after the sending of the
Offeror’s Notice, if applicable, send his or her Debenture certificate(s) to the 

  

 46 

 
Debenture Trustee duly endorsed for transfer or, if the Debentures are represented by a Global Certificate, cause the Depository to be instructed through one
or more Depository Participants to facilitate the transfer of the Debentures beneficially held by such holder. 
  

	11.5	Payment of Consideration to Debenture Trustee 

  
 Within 21 days after the Offeror sends an Offeror’s Notice pursuant to Section 11.3, the Offeror shall pay or transfer to the Debenture Trustee, or
to such other person as the Debenture Trustee may direct, the cash or other consideration that is payable to Dissenting Debentureholders pursuant to Section 11.2. 
  

	11.6	Consideration to be held in Trust 

  
 The Debenture Trustee, or the person directed by the Debenture Trustee, shall hold in trust for the Dissenting Debentureholders the cash or other
consideration they or it receives under Section 11.5. The Debenture Trustee, or such persons, shall deposit cash in a separate account in a Canadian chartered bank, or other body corporate, any of whose deposits are insured by the Canada Deposit
Insurance Corporation, and shall place other consideration in the custody of a Canadian chartered bank or such other body corporate. The Debenture Trustee or such persons may also deposit cash in a segregated trust account with the Debenture
Trustee. 
  

	11.7	Completion of Transfer of Debentures to Offeror 

  
 Within 30 days after the date of the sending of an Offeror’s Notice pursuant to Section 11.3, the Debenture Trustee, if the Offeror has complied with
Section 11.5, shall: 
  

	(a)	do all acts and things and execute and cause to be executed all instruments as in the Debenture Trustee’s opinion may be necessary or desirable to cause the transfer of the
Debentures of the Dissenting Debentureholders to the Offeror; 

  

	(b)	send to each Dissenting Debentureholder who has complied with Section 11.4 the consideration to which such Dissenting Debentureholder is entitled under this Article 11; and

  

	(c)	send to each Dissenting Debentureholder who has not complied with Section 11.4 a notice stating that: 

  

	 	(i)	his or her Debentures have been transferred to the Offeror; 

  

	 	(ii)	the Debenture Trustee or some other person designated in such notice are holding in trust the consideration for such Debentures; and 

  

	 	(iii)	the Debenture Trustee, or such other person, will send the consideration to such Dissenting Debentureholder as soon as possible after receiving such Dissenting
Debentureholder’s Debenture certificate(s) or such other documents as the Debenture Trustee or such other person may require in lieu thereof; 

  
 and the Debenture Trustee is hereby appointed the agent and attorney of the Dissenting Debentureholders for the purposes of
giving effect to the foregoing provisions. 
  

	11.8	Communication of Offer to Corporation 

  
 An Offeror cannot make an Offer for Debentures unless, concurrent with the communication of the Offer to any Debentureholder, a copy of the Offer is
provided to the Corporation. 
  

 47 

 ARTICLE 12 
 MEETINGS OF DEBENTUREHOLDERS 
  

	12.1	Right to Convene Meeting 

  
 The Debenture Trustee or the Corporation may at any time and from time to time, and the Debenture Trustee shall, on receipt of a written request of the
Corporation or a written request signed by the holders of not less than 25% of the principal amount of the Debentures then outstanding (or by holders of Global Debentures on instructions of Beneficial Holders through one or more Depository
Participants of not less than 25% in principal amount of the Debentures then outstanding) and upon receiving funding and being indemnified to its reasonable satisfaction by the Corporation or by the Debentureholders signing such request against the
costs which may be incurred in connection with the calling and holding of such meeting, convene a meeting of the Debentureholders. In the event of the Debenture Trustee failing, within 30 days after receipt of any such request and such funding of
indemnity, to give notice convening a meeting, the Corporation or such Debentureholders, as the case may be, may convene such meeting. Every such meeting shall be held in the City of Toronto, or Houston, Texas, USA, or at such other place as may be
approved or determined by the Debenture Trustee. 
  

	12.2	Notice of Meetings 

  

	(a)	At least 21 days notice of any meeting shall be given to the Debentureholders in the manner provided in Section 13.2 and a copy of such notice shall be sent by post to the Debenture
Trustee, unless the meeting has been called by it. Such notice shall state the time when and the place where the meeting is to be held and shall state briefly the general nature of the business to be transacted thereat and it shall not be necessary
for any such notice to set out the terms of any resolution to be proposed or any of the provisions of this Article. The accidental omission to give notice of a meeting to any holder of Debentures shall not invalidate any resolution passed at any
such meeting. A holder may waive notice of a meeting either before or after the meeting. 

  

	(b)	If the business to be transacted at any meeting by Extraordinary Resolution or otherwise, or any action to be taken or power exercised by instrument in writing under Section 12.15,
especially affects the rights of holders of Debentures of one or more series in a manner or to an extent differing in any material way from that in or to which the rights of holders of Debentures of any other series are affected (determined as
provided in Sections 12.2(c) and (d)), then: 

  

	 	(i)	a reference to such fact, indicating each series of Debentures in the opinion of the Debenture Trustee so especially affected (hereinafter referred to as the “especially
affected series”) shall be made in the notice of such meeting, and in any such case the meeting shall be and be deemed to be and is herein referred to as a “Serial Meeting”; and 

  

	 	(ii)	the holders of Debentures of an especially affected series shall not be bound by any action taken at a Serial Meeting or by instrument in writing under Section 12.15 unless in
addition to compliance with the other provisions of this Article 12: 

  

	 	(A)	at such Serial Meeting: (I) there are Debentureholders present in person or by proxy and representing at least 25% in principal amount of the Debentures then outstanding of such
series, subject to the provisions of this Article 13 as to quorum at adjourned meetings; and (II) the resolution is passed by the affirmative vote of the holders of more than 50% (or in the case of an Extraordinary Resolution not less than 66 2/3%)
of the principal amount of the Debentures of such series then outstanding voted on the resolution; or 

  

	 	(B)	in the case of action taken or power exercised by instrument in writing under Section 12.15, such instrument is signed in one or more counterparts by the holders of not less than 66
2/3% in principal amount of the Debentures of such series then outstanding. 

  

 48 

	(c)	Subject to Section 12.2(d), the determination as to whether any business to be transacted at a meeting of Debentureholders, or any action to be taken or power to be exercised by
instrument in writing under Section 12.15, especially affects the rights of the Debentureholders of one or more series in a manner or to an extent differing in any material way from that in or to which it affects the rights of Debentureholders of
any other series (and is therefore an especially affected series) shall be determined by an opinion of Counsel, which shall be binding on all Debentureholders, the Debenture Trustee and the Corporation for all purposes hereof.

  

	(d)	A proposal: 

  

	 	(i)	to extend the maturity of Debentures of any particular series or to reduce the principal amount thereof, the rate of interest or redemption premium thereon or to impair any
conversion right thereof; 

  

	 	(ii)	to modify or terminate any covenant or agreement which by its terms is effective only so long as Debentures of a particular series are outstanding; or 

  

	 	(iii)	to reduce with respect to Debentureholders of any particular series any percentage stated in this Section 12.2 or Sections 12.4, 12.12 and 12.15; 

  
 shall be deemed to especially affect the rights of the Debentureholders of
such series in a manner differing in a material way from that in which it affects the rights of holders of Debentures of any other series, whether or not a similar extension, reduction, modification or termination is proposed with respect to
Debentures of any or all other series. 
  

	12.3	Chairman 

  
 Some person, who need not be a Debentureholder, nominated in writing by the Debenture Trustee shall be chairman of the meeting and if no person is so
nominated, or if the person so nominated is not present within 15 minutes from the time fixed for the holding of the meeting, a majority of the Debentureholders present in person or by proxy shall choose some person present to be chairman.

  

	12.4	Quorum 

  
 Subject to the provisions of Section 12.12, at any meeting of the Debentureholders a quorum shall consist of Debentureholders present in person or by
proxy and representing at least 25% in principal amount of the outstanding Debentures and, if the meeting is a Serial Meeting, at least 25% of the Debentures then outstanding of each especially affected series. If a quorum of the Debentureholders
shall not be present within 30 minutes from the time fixed for holding any meeting, the meeting, if summoned by the Debentureholders or pursuant to a request of the Debentureholders, shall be dissolved, but in any other case the meeting shall be
adjourned to the same day in the next week (unless such day is not a Business Day in which case it shall be adjourned to the next following Business Day thereafter) at the same time and place and no notice shall be required to be given in respect of
such adjourned meeting. At the adjourned meeting, the Debentureholders present in person or by proxy shall, subject to the provisions of Section 12.12, constitute a quorum and may transact the business for which the meeting was originally convened
notwithstanding that they may not represent 25% of the principal amount of the outstanding Debentures or of the Debentures then outstanding of each especially affected series. Any business may be brought before or dealt with at an adjourned meeting,
which might have been brought before or dealt with at the original meeting in accordance with the notice calling the same. No business shall be transacted at any meeting unless the required quorum is present at the commencement of business.

  

	12.5	Power to Adjourn 

  
 The chairman of any meeting at which a quorum of the Debentureholders is present may, with the consent of the holders of a majority in principal amount of
the Debentures represented thereat, adjourn any such meeting and no notice of such adjournment need be given except such notice, if any, as the meeting may prescribe. 
  

 49 

	12.6	Show of Hands 

  
 Every question submitted to a meeting shall, subject to Section 12.7, be decided in the first place by a majority of the votes given on a show of hands
except that votes on Extraordinary Resolutions shall be given in the manner hereinafter provided. At any such meeting, unless a poll is duly demanded as herein provided, a declaration by the chairman that a resolution has been carried or carried
unanimously or by a particular majority or lost or not carried by a particular majority shall be conclusive evidence of the fact. The chairman of any meeting shall be entitled, both on a show of hands and on a poll, to vote in respect of the
Debentures, if any, held by him. 
  

	12.7	Poll 

  
 On every Extraordinary Resolution, and on any other question submitted to a meeting when demanded by the chairman or by one or more Debentureholders or proxies for Debentureholders, a poll shall be taken in such
manner and either at once or after an adjournment as the chairman shall direct. Questions other than Extraordinary Resolutions shall, if a poll be taken, be decided by the votes of the holders of a majority in principal amount of the Debentures and
of each especially affected series, if applicable, represented at the meeting and voted on the poll. 
  

	12.8	Voting 

  
 On a show of hands every person who is present and entitled to vote, whether as a Debentureholder or as proxy for one or more Debentureholders or both,
shall have one vote. On a poll each Debentureholder present in person or represented by a proxy duly appointed by an instrument in writing shall be entitled to one vote in respect of each US$1,000 principal amount of Debentures of which he shall
then be the holder. In the case of any Debenture denominated in a currency or currency unit other than US dollars, the principal amount thereof for these purposes shall be computed in US dollars in accordance with Section 1.8 on the Business Day
next preceding the meeting. Any fractional amounts resulting from such conversion shall be rounded to the nearest US$100. A proxy need not be a Debentureholder. In the case of joint holders of a Debenture, any one of them present in person or by
proxy at the meeting may vote in the absence of the other or others but in case more than one of them be present in person or by proxy, they shall vote together in respect of the Debentures of which they are joint holders. 
  

	12.9	Proxies 

  
 A Debentureholder may be present and vote at any meeting of Debentureholders by an authorized representative. The Corporation (in case it convenes the
meeting) or the Debenture Trustee (in any other case) for the purpose of enabling the Debentureholders to be present and vote at any meeting without producing their Debentures, and of enabling them to be present and vote at any such meeting by proxy
and of lodging instruments appointing such proxies at some place other than the place where the meeting is to be held, may from time to time make and vary such regulations as it shall think fit providing for and governing any or all of the following
matters: 
  

	(a)	the form of the instrument appointing a proxy, which shall be in writing, and the manner in which the same shall be executed and the production of the authority of any person
signing on behalf of a Debentureholder; 

  

	(b)	the deposit of instruments appointing proxies at such place as the Debenture Trustee, the Corporation or the Debentureholder convening the meeting, as the case may be, may, in the
notice convening the meeting, direct and the time, if any, before the holding of the meeting or any adjournment thereof by which the same must be deposited; 

  

	(c)	the deposit of instruments appointing proxies at some approved place or places other than the place at which the meeting is to be held and enabling particulars of such instruments
appointing proxies to be mailed, faxed, or sent by other electronic communication before the meeting to the Corporation or to the Debenture Trustee at the place where the same is to be held and for the voting of proxies so deposited as though the
instruments themselves were produced at the meeting; and 

  

 50 

	(d)	generally for the calling of meetings of the Debentureholders and the conduct of business thereat. 

  
 Any regulations so made shall be binding and effective and the votes given in accordance therewith shall be valid and shall be counted. Save
as such regulations may provide, the only persons who shall be recognized at any meeting as the holders of any Debentures, or as entitled to vote or be present at the meeting in respect thereof, shall be Debentureholders and persons whom
Debentureholders have by instrument in writing duly appointed as their proxies. 
  

	12.10 	Persons Entitled to Attend Meetings 

  
 The Corporation and the Debenture Trustee, by their respective officers and directors and employees, the Auditors of the Corporation and the legal
advisers of the Corporation, the Debenture Trustee or any Debentureholder may attend any meeting of the Debentureholders, but shall have no vote as such. 
  

	12.11 	Powers Exercisable by Extraordinary Resolution 

  
 In addition to the powers conferred upon them by any other provisions of this Indenture or by law, a meeting of the Debentureholders shall have the
following powers exercisable from time to time by Extraordinary Resolution, subject in the case of the matters in paragraphs (a), (b), (c), (d) and (l) to receipt of the prior approval of the Toronto Stock Exchange or such other exchange on which
the Debentures are then listed: 
  

	(a)	power to authorize the Debenture Trustee to grant extensions of time for payment of any principal, premium or interest on the Debentures, whether or not the principal, premium, or
interest, the payment of which is extended, is at the time due or overdue; 

  

	(b)	power to sanction any modification, abrogation, alteration, compromise or arrangement of the rights of the Debentureholders or the Debenture Trustee against the Corporation (subject
to the consent of the Debenture Trustee), or against its property, whether such rights arise under this Indenture or the Debentures or otherwise; 

  

	(c)	power to assent to any modification of or change in or addition to or omission from the provisions contained in this Indenture or any Debenture which shall be agreed to by the
Corporation and to authorize the Debenture Trustee to concur in and execute any indenture supplemental hereto embodying any modification, change, addition or omission; 

  

	(d)	power to sanction any scheme for the reconstruction, reorganization or recapitalization of the Corporation or for the consolidation, amalgamation or merger of the Corporation with
any other Person or for the sale, leasing, transfer or other disposition of all or substantially all of the undertaking, property and assets of the Corporation or any part thereof, provided that no such sanction shall be necessary in respect of any
such transaction if the provisions of Section 10.1 shall have been complied with; 

  

	(e)	power to direct or authorize the Debenture Trustee to exercise any power, right, remedy or authority given to it by this Indenture in any manner specified in any such Extraordinary
Resolution or to refrain from exercising any such power, right, remedy or authority; 

  

	(f)	power to waive, and direct the Debenture Trustee to waive, any default hereunder and/or cancel any declaration made by the Debenture Trustee pursuant to Section 8.1 either
unconditionally or upon any condition specified in such Extraordinary Resolution; 

  

	(g)	power to restrain any Debentureholder from taking or instituting any suit, action or proceeding for the purpose of enforcing payment of the principal, premium or interest on the
Debentures, or for the execution of any trust or power hereunder; 

  

	(h)	 power to direct any Debentureholder who, as such, has brought any action, suit or proceeding to stay or discontinue or otherwise deal with the same upon payment, if
the taking of such suit, action or proceeding 

  

 51 

	 	 
shall have been permitted by Section 8.5, of the costs, charges and expenses reasonably and properly incurred by such Debentureholder in connection
therewith; 

  

	(i)	power to assent to any compromise or arrangement with any creditor or creditors or any class or classes of creditors, whether secured or otherwise, and with holders of any shares or
other securities of the Corporation; 

  

	(j)	power to appoint a committee with power and authority (subject to such limitations, if any, as may be prescribed in the resolution) to exercise, and to direct the Debenture Trustee
to exercise, on behalf of the Debentureholders, such of the powers of the Debentureholders as are exercisable by Extraordinary Resolution or other resolution as shall be included in the resolution appointing the committee. The resolution making such
appointment may provide for payment of the expenses and disbursements of and compensation to such committee. Such committee shall consist of such number of persons as shall be prescribed in the resolution appointing it and the members need not be
themselves Debentureholders. Every such committee may elect its chairman and may make regulations respecting its quorum, the calling of its meetings, the filling of vacancies occurring in its number and its procedure generally. Such regulations may
provide that the committee may act at a meeting at which a quorum is present or may act by minutes signed by the number of members thereof necessary to constitute a quorum. All acts of any such committee within the authority delegated to it shall be
binding upon all Debentureholders. Neither the committee nor any member thereof shall be liable for any loss arising from or in connection with any action taken or omitted to be taken by them in good faith; 

  

	(k)	power to remove the Debenture Trustee from office and to appoint a new Debenture Trustee or Debenture Trustees provided that no such removal shall be effective unless and until a
new Debenture Trustee or Debenture Trustees shall have become bound by this Indenture, and the Corporation shall have consented to such new Debenture Trustee, such consent to not be unreasonably withheld; 

  

	(l)	power to sanction the exchange of the Debentures for or the conversion thereof into shares, bonds, debentures or other securities or obligations of the Corporation or of any other
Person formed or to be formed; 

  

	(m)	power to authorize the distribution in specie of any shares or securities received pursuant to a transaction authorized under the provisions of Section 12.11(l); and

  

	(n)	power to amend, alter or repeal any Extraordinary Resolution previously passed or sanctioned by the Debentureholders or by any committee appointed pursuant to Section 12.11(j).

  
 Notwithstanding the foregoing provisions of this
Section 12.11 none of such provisions shall in any manner allow or permit any amendment, modification, abrogation or addition to the provisions of Article 5 which could reasonably be expected to detrimentally affect the rights, remedies or recourse
of the priority of the Senior Creditors, nor shall any of such provisions of this Section 12.11 in any manner allow or permit any amendment, modification, abrogation or addition to the provisions of this Indenture which would be prejudicial to the
rights, remedies and recourse hereunder of the Debenture Trustee on its own account. 
  
 Notwithstanding the foregoing provision of this Section 12.11, the Corporation and the Debenture Trustee may amend this Indenture or the Debentures for certain purposes, without the consent of the Debentureholders,
including to (i) cure any ambiguity, defect or inconsistency, provided, however, that the amendment to cure any such ambiguity, defect or inconsistency does not materially adversely affect the rights of the Debentureholders; (ii) provide for the
assumption by a successor of the Corporation’s or the Debenture Trustee’s obligations under this Indenture; (iii) make any change to comply with any applicable laws or requirements of any governmental authority relating to trust
indentures; (iv) add to the Corporation’s covenants or the Corporation’s obligations under this Indenture for the protection of Debentureholders; or (v) make any other change that does not adversely affect the rights of Debentureholders.

  

 52 

	12.12 	Meaning of “Extraordinary Resolution” 

  

	(a)	The expression “Extraordinary Resolution” when used in this Indenture means, subject as hereinafter in this Article provided, a resolution proposed to be passed as
an Extraordinary Resolution at a meeting of Debentureholders (including an adjourned meeting) duly convened for the purpose and held in accordance with the provisions of this Article at which the holders of not less than 25% of the principal amount
of the Debentures then outstanding, and if the meeting is a Serial Meeting, at which holders of not less than 25% of the principal amount of the Debentures then outstanding of each especially affected series, are present in person or by proxy and
passed by the favourable votes of the holders of not less than 66 2/3% of the principal amount of the Debentures, and if the meeting is a Serial Meeting by the affirmative vote of the holders of not less than 66 2/3% of each especially affected
series, in each case present or represented by proxy at the meeting and voted upon on a poll on such resolution. 

  

	(b)	If, at any such meeting, the holders of not less than 25% of the principal amount of the Debentures then outstanding and, if the meeting is a Serial Meeting, 25% of the principal
amount of the Debentures then outstanding of each especially affected series, in each case are not present in person or by proxy within 30 minutes after the time appointed for the meeting, then the meeting, if convened by or on the requisition of
Debentureholders, shall be dissolved but in any other case it shall stand adjourned to such date, being not less than 14 nor more than 60 days later, and to such place and time as may be appointed by the chairman. Not less than 10 days notice shall
be given of the time and place of such adjourned meeting in the manner provided in Section 13.2. Such notice shall state that at the adjourned meeting the Debentureholders present in person or by proxy shall form a quorum. At the adjourned meeting
the Debentureholders present in person or by proxy shall form a quorum and may transact the business for which the meeting was originally convened and a resolution proposed at such adjourned meeting and passed thereat by the affirmative vote of
holders of not less than 66 2/3% of the principal amount of the Debentures and, if the meeting is a Serial Meeting, by the affirmative vote of the holders of not less than 66 2/3% of the principal amount of the Debentures of each especially affected
series, in each case present or represented by proxy at the meeting voted upon on a poll shall be an Extraordinary Resolution within the meaning of this Indenture, notwithstanding that the holders of not less than 25% in principal amount of the
Debentures then outstanding, and if the meeting is a Serial Meeting, holders of not less than 25% of the principal amount of the Debentures then outstanding of each especially affected series, are not present in person or by proxy at such adjourned
meeting. 

  

	(c)	Votes on an Extraordinary Resolution shall always be given on a poll and no demand for a poll on an Extraordinary Resolution shall be necessary. 

  

	12.13 	Powers Cumulative 

  
 Any one or more of the powers in this Indenture stated to be exercisable by the Debentureholders by Extraordinary Resolution or otherwise may be exercised
from time to time and the exercise of any one or more of such powers from time to time shall not be deemed to exhaust the rights of the Debentureholders to exercise the same or any other such power or powers thereafter from time to time. 

 

	12.14 	Minutes 

  
 Minutes of all resolutions and proceedings at every meeting as aforesaid shall be made and duly entered in books to be from time to time provided for that
purpose by the Debenture Trustee at the expense of the Corporation, and any such minutes as aforesaid, if signed by the chairman of the meeting at which such resolutions were passed or proceedings had, or by the chairman of the next succeeding
meeting of the Debentureholders, shall be prima facie evidence of the matters therein stated and, until the contrary is proved, every such meeting, in respect of the proceedings of which minutes shall have been made, shall be deemed to have
been duly held and convened, and all resolutions passed thereat or proceedings taken thereat to have been duly passed and taken. 
  

 53 

	12.15 	Instruments in Writing 

  
 All actions which may be taken and all powers that may be exercised by the Debentureholders at a meeting held as hereinbefore in this Article provided may
also be taken and exercised by the holders of 66 2/3% of the principal amount of all the outstanding Debentures and, if the meeting at which such actions might be taken would be a Serial Meeting, by the holders of 66 2/3% of the principal amount of
the Debentures then outstanding of each especially affected series, by an instrument in writing signed in one or more counterparts and the expression “Extraordinary Resolution” when used in this Indenture shall include an instrument
so signed. 
  

	12.16 	Binding Effect of Resolutions 

  
 Every resolution and every Extraordinary Resolution passed in accordance with the provisions of this Article at a meeting of Debentureholders shall be
binding upon all the Debentureholders, whether present at or absent from such meeting, and every instrument in writing signed by Debentureholders in accordance with Section 12.15 shall be binding upon all the Debentureholders, whether signatories
thereto or not, and each and every Debentureholder and the Debenture Trustee (subject to the provisions for its indemnity herein contained) shall be bound to give effect accordingly to every such resolution, Extraordinary Resolution and instrument
in writing. 
  

	12.17 	Evidence of Rights Of Debentureholders 

  

	(a)	Any request, direction, notice, consent or other instrument that this Indenture may require or permit to be signed or executed by the Debentureholders may be in any number of
concurrent instruments of similar tenor signed or executed by such Debentureholders. 

  

	(b)	The Debenture Trustee may, in its discretion, require proof of execution in cases where it deems proof desirable and may accept such proof as it shall consider proper.

  

	12.18 	Concerning Serial Meetings 

  
 If in the opinion of Counsel any business to be transacted at any meeting, or any action to be taken or power to be exercised by instrument in writing
under Section 12.15, does not adversely affect the rights of the holders of Debentures of one or more series, the provisions of this Article 12 shall apply as if the Debentures of such series were not outstanding and no notice of any such meeting
need be given to the holders of Debentures of such series. Without limiting the generality of the foregoing, a proposal to modify or terminate any covenant or agreement that is effective only so long as Debentures of a particular series are
outstanding shall be deemed not to adversely affect the rights of the holders of Debentures of any other series. 
  
 ARTICLE 13 
 NOTICES 
  

	13.1 	Notice to Corporation 

  
 Any notice to the Corporation under the provisions of this Indenture shall be valid and effective if delivered to the Corporation at: 2480 W Campus Drive,
Building C, Mt. Pleasant, Michigan, 48858, or if given by registered letter, postage prepaid, to such offices and so addressed and if mailed, shall be deemed to have been effectively given three days following the mailing thereof. The Corporation
may from time to time notify the Debenture Trustee in writing of a change of address which thereafter, until changed by like notice, shall be the address of the Corporation for all purposes of this Indenture. 
  
 If by reason of any interruption of mail service, actual or threatened, any
notice to be given to the Corporation would reasonably be unlikely to reach its destination by the time notice by mail is deemed to have been given pursuant to this Section 13.1, such notice shall be valid and effective only if delivered at the
appropriate address in accordance with this Section 13.1 
  

 54 

	13.2	Notice to Debentureholders 

  
 All notices to be given hereunder with respect to the Debentures shall be deemed to be validly given to the holders thereof if sent by first class mail,
postage prepaid, by letter or circular addressed to such holders at their post office addresses appearing in any of the registers hereinbefore mentioned and shall be deemed to have been effectively given three days following the day of mailing.
Accidental error or omission in giving notice or accidental failure to mail notice to any Debentureholder or the inability of the Corporation to give or mail any notice due to anything beyond the reasonable control of the Corporation shall not
invalidate any action or proceeding founded thereon. 
  
 If any
notice given in accordance with the foregoing paragraph would be unlikely to reach the Debentureholders to whom it is addressed in the ordinary course of post by reason of an interruption in mail service, whether at the place of dispatch or receipt
or both, the Corporation shall give such notice by publication at least once in the City of Calgary (or in such of those cities as, in the opinion of the Debenture Trustee, is sufficient in the particular circumstances), each such publication to be
made in a daily newspaper of general circulation in the designated city. 
  
 Any notice given to Debentureholders by publication shall be deemed to have been given on the day on which publication shall have been effected at least once in each of the newspapers in which publication was
required. 
  
 All notices with respect to any Debenture may be
given to whichever one of the holders thereof (if more than one) is named first in the registers hereinbefore mentioned, and any notice so given shall be sufficient notice to all holders of any persons interested in such Debenture. 
  

	13.3	Notice to Debenture Trustee 

  
 Any notice to the Debenture Trustee under the provisions of this Indenture shall be valid and effective if delivered to the Debenture Trustee at its
principal office in the City of Calgary, at the following address: CIBC Mellon Trust Company, 600, 333 – 7th
Avenue S.W., Calgary, Alberta, T2P 2Z1, Attention: Robert Inkster, Facsimile Number: (403) 264-2100 or if given by registered letter, postage prepaid, to such office and so addressed and, if mailed, shall be deemed to have been effectively given
three days following the mailing thereof. The Debenture Trustee may from time to time notify the Corporation in writing of a change of address which thereafter, until by like notice shall be the address of the Debenture Trustee to receive notices
from the Corporation. 
  

	13.4	Mail Service Interruption 

  
 If by reason of any interruption of mail service, actual or threatened, any notice to be given to the Debenture Trustee would reasonably be unlikely to
reach its destination by the time notice by mail is deemed to have been given pursuant to Section 13.3, such notice shall be valid and effective only if delivered at the appropriate address in accordance with Section 13.3. 
  
 ARTICLE 14 
 CONCERNING THE DEBENTURE TRUSTEE 
  

	14.1	No Conflict of Interest 

  
 The Debenture Trustee represents to the Corporation that at the date of execution and delivery by it of this Indenture there exists no material conflict
of interest in the role of the Debenture Trustee as a fiduciary hereunder but if, notwithstanding the provisions of this Section 14.1, such a material conflict of interest exists, or hereafter arises, the validity and enforceability of this
Indenture, and the Debentures issued hereunder, shall not be affected in any manner whatsoever by reason only that such material conflict of interest exists or arises but the Debenture Trustee shall, within 90 days after ascertaining that it has a
material conflict of interest, either eliminate such material conflict of interest or resign in the manner and with the effect specified in Section 14.2. 
  

 55 

	14.2	Replacement of Debenture Trustee 

  
 The Debenture Trustee may resign its trust and be discharged from all further duties and liabilities hereunder by giving to the Corporation 60 days notice
in writing or such shorter notice as the Corporation may accept as sufficient. If at any time a material conflict of interest exists in the Debenture Trustee’s role as a fiduciary hereunder the Debenture Trustee shall, within 90 days after
ascertaining that such a material conflict of interest exists, either eliminate such material conflict of interest or resign in the manner and with the effect specified in this Section 14.2. The validity and enforceability of this Indenture and of
the Debentures issued hereunder shall not be affected in any manner whatsoever by reason only that such a material conflict of interest exists. In the event of the Debenture Trustee resigning or being removed or being dissolved, becoming bankrupt,
going into liquidation or otherwise becoming incapable of acting hereunder, the Corporation shall forthwith appoint a new Debenture Trustee unless a new Debenture Trustee has already been appointed by the Debentureholders. Failing such appointment
by the Corporation, the retiring Debenture Trustee or any Debentureholder may apply to a Judge of the Alberta Court of Queen’s Bench, on such notice as such Judge may direct at the Corporation’s expense, for the appointment of a new
Debenture Trustee but any new Debenture Trustee so appointed by the Corporation or by the Court shall be subject to removal as aforesaid by the Debentureholders and the appointment of such new Debenture Trustee shall be effective only upon such new
Debenture Trustee becoming bound by this Indenture. Any new Debenture Trustee appointed under any provision of this Section 14.2 shall be a corporation authorized to carry on the business of a trust company in all of the Provinces of Canada. On any
new appointment the new Debenture Trustee shall be vested with the same powers, rights, duties and responsibilities as if it had been originally named herein as Debenture Trustee. 
  
 Any company into which the Debenture Trustee may be merged or, with or to which it may be consolidated, amalgamated or sold,
or any company resulting from any merger, consolidation, sale or amalgamation to which the Debenture Trustee shall be a party, or any company acquiring all or substantially all or succeeding to the corporate trust business of the Debenture Trustee
shall be the successor trustee under this Indenture without the execution of any instrument or any further act. Nevertheless, upon the written request of the successor Debenture Trustee or of the Corporation, and upon payment of all outstanding fees
and expenses owed by the Corporation to the Debenture Trustee, the Debenture Trustee ceasing to act shall execute and deliver an instrument assigning and transferring to such successor Debenture Trustee, upon the trusts herein expressed, all the
rights, powers and trusts of the Debenture Trustee so ceasing to act, and shall duly assign, transfer and deliver all property and money held by such Debenture Trustee to the successor Debenture Trustee so appointed in its place. Should any deed,
conveyance or instrument in writing from the Corporation be required by any new Debenture Trustee for more fully and certainly vesting in and confirming to it such estates, properties, rights, powers and trusts, then any and all such deeds,
conveyances and instruments in writing shall on request of said new Debenture Trustee, be made, executed, acknowledged and delivered by the Corporation. 
  

	14.3	Duties of Debenture Trustee 

  
 In the exercise of the rights, duties and obligations prescribed or conferred by the terms of this Indenture, the Debenture Trustee shall act honestly and
in good faith and exercise that degree of care, diligence and skill that a reasonably prudent trustee would exercise in comparable circumstances. 
  

	14.4	Reliance Upon Declarations, Opinions, etc. 

  
 In the exercise of its rights, duties and obligations hereunder the Debenture Trustee may, if acting in good faith, act and rely, as to the truth of the
statements and accuracy of the opinions expressed therein, upon statutory declarations, written notices, requests, waivers, consents, opinions, reports, certificates or other paper or document furnished to it pursuant to any covenant, condition or
requirement of this Indenture or required by the Debenture Trustee to be furnished to it in the exercise of its rights and duties hereunder, and the Debenture Trustee, if it reasonably believes such document to be genuine and what it purports to be
shall be protected in acting upon such, basing such action on a belief, in good faith, in its due execution and the validity and effectiveness of its provisions, as well as in the truth and acceptability of any information therein contained. The
Debenture Trustee may nevertheless, in its discretion, require further proof in cases where it deems further proof desirable. Without restricting the foregoing, the Debenture Trustee may act and rely on an opinion of Counsel satisfactory to the

  

 56 

 
Debenture Trustee notwithstanding that it is delivered by a solicitor or firm which acts as solicitors for the Corporation. 
  

	14.5	Evidence and Authority to Debenture Trustee, Opinions, etc. 

  
 The Corporation shall furnish to the Debenture Trustee evidence of compliance with the conditions precedent provided for in this Indenture relating to any
action or step required or permitted to be taken by the Corporation or the Debenture Trustee under this Indenture or as a result of any obligation imposed under this Indenture, including without limitation, the certification and delivery of
Debentures hereunder, the satisfaction and discharge of this Indenture and the taking of any other action to be taken by the Debenture Trustee at the request of or on the application of the Corporation, forthwith if and when (a) such evidence is
required by any other Section of this Indenture to be furnished to the Debenture Trustee in accordance with the terms of this Section 14.5, or (b) the Debenture Trustee, in the exercise of its rights and duties under this Indenture, gives the
Corporation written notice requiring it to furnish such evidence in relation to any particular action or obligation specified in such notice. 
  
 Such evidence shall consist of: 
  

	(a)	a certificate made by any one officer or director of the Corporation, on behalf of the Corporation, stating that any such condition precedent has been complied with in accordance
with the terms of this Indenture; 

  

	(b)	in the case of a condition precedent compliance with which is, by the terms of this Indenture, made subject to review or examination by a solicitor, an opinion of Counsel that such
condition precedent has been complied with in accordance with the terms of this Indenture; and 

  

	(c)	in the case of any such condition precedent compliance with which is subject to review or examination by auditors or accountants, an opinion or report of the Auditors of the
Corporation whom the Debenture Trustee for such purposes hereby approves, that such condition precedent has been complied with in accordance with the terms of this Indenture. 

  
 Whenever such evidence relates to a matter other than the certificates and
delivery of Debentures and the satisfaction and discharge of this Indenture, and except as otherwise specifically provided herein, such evidence may consist of a report or opinion of any solicitor, auditor, accountant, engineer or appraiser or any
other person whose qualifications give authority to a statement made by him, provided that if such report or opinion is furnished by a trustee, officer or employer of the Corporation it shall be in the form of a statutory declaration. Such evidence
shall be, so far as appropriate, in accordance with the immediately preceding paragraph of this Section. 
  
 Each statutory declaration, certificate, opinion or report with respect to compliance with a condition precedent provided for in the Indenture shall
include (a) a statement by the person giving the evidence that he has read and is familiar with those provisions of this Indenture relating to the condition precedent in question, (b) a brief statement of the nature and scope of the examination or
investigation upon which the statements or opinions contained in such evidence are based, (c) a statement that, in the belief of the person giving such evidence, he has made such examination or investigation as is necessary to enable him to make the
statements or give the opinions contained or expressed therein, and (d) a statement whether in the opinion of such person the conditions precedent in question have been complied with or satisfied. 
  
 The Corporation shall furnish to the Debenture Trustee at any time if the
Debenture Trustee reasonably so requires, its certificate that the Corporation has complied with all covenants, conditions or other requirements contained in this Indenture, the non-compliance with which would, with the giving of notice or the lapse
of time, or both, or otherwise, constitute an Event of Default, or if such is not the case, specifying the covenant, condition or other requirement which has not been complied with and giving particulars of such non-compliance. The Corporation
shall, whenever the Debenture Trustee so requires, furnish the Debenture Trustee with evidence by way of statutory declaration, opinion, report or certificate as specified by the Debenture Trustee as to any action or step required or permitted to be
taken by the Corporation or as a result of any obligation imposed by this Indenture. 
  

 57 

	14.6	Officer’s Certificates Evidence 

  
 Except as otherwise specifically provided or prescribed by this Indenture, whenever in the administration of the provisions of this Indenture the
Debenture Trustee shall deem it necessary or desirable that a matter be proved or established prior to taking or omitting any action hereunder, the Debenture Trustee, if acting in good faith, may rely upon an Officer’s Certificate. 

 

	14.7	Experts, Advisers and Agents 

  
 The Debenture Trustee may: 
  

	(a)	employ or retain and act and rely on the opinion or advice of or information obtained from any solicitor, auditor, valuer, engineer, surveyor, appraiser or other expert, whether
obtained by the Debenture Trustee or by the Corporation, or otherwise, and shall not be liable for acting, or refusing to act, in good faith on any such opinion or advice and the costs of such experts shall be part of the Debenture Trustee’s
fees hereunder; and 

  

	(b)	employ such agents and other assistants as it may reasonably require for the proper determination and discharge of its duties hereunder (and shall be entitled to receive reasonable
remuneration for all services performed by it), and in the discharge of the trusts hereof and compensation for all disbursements, costs and expenses made or incurred by it in the discharge of its duties hereunder and in the management of the trusts
hereof and any solicitors employed or consulted by the Debenture Trustee may, but need not be, solicitors for the Corporation. 

  

	14.8	Debenture Trustee May Deal in Debentures 

  
 Subject to Sections 14.1 and 14.3, the Debenture Trustee may, in its personal or other capacity, buy, sell, lend upon and deal in the Debentures and
generally contract and enter into financial transactions with the Corporation or otherwise, without being liable to account for any profits made thereby. 
  

	14.9	Investment of Monies Held by Debenture Trustee 

  
 Upon receipt of a direction from the Corporation, the Debenture Trustee shall invest the funds in Authorized Investments in its name in accordance with
such direction. Any direction from the Corporation to the Debenture Trustee shall be in writing and shall be provided to the Debenture Trustee no later than 9:00a.m (Calgary Time) on the day on which the investment is to be made. Any such direction
received by the Debenture Trustee after 9:00a.m (Calgary Time) or received on a non-Business Day, shall be deemed to have been given prior to 9:00a.m. (Calgary Time) the next Business Day. For the purposes hereof, “Authorized Investments”
means short term interest bearing or discount debt obligations issued or guaranteed by the Government of Canada or a Province or a Canadian chartered bank (which may include an Affiliate or related party of the Debenture Trustee) provided that such
obligation is rated at least R1 (middle) by DBRS Inc. or an equivalent rating service. 
  
 In the event that the Debenture Trustee does no receive a direction or only a partial direction, the Debenture Trustee may hold cash balances constituting part or all of the funds and may, but need not, invest same in
its deposit department or the deposit department of one of its Affiliates; but the Debenture Trustee and its Affiliates shall not be liable to account for any profit to any parties to this Indenture or to any other person or entity other than at a
rate, if any, established from time to time by the Debenture Trustee or one of its Affiliates. For the purpose of this Section, “Affiliate” means affiliated companies within the meaning of the Business Corporations Act (Ontario)
(“OBCA”); and includes Canadian Imperial Bank of Commerce, CIBC Mellon Global Securities Services Company and Mellon Bank, N.A. and each of their affiliates within the meaning of the OBCA. 
  
 Unless and until the Debenture Trustee shall have declared the principal of
and interest on the Debentures to be due and payable, the Debenture Trustee shall pay over to the Corporation all interest received by the Debenture Trustee in respect of any investments or deposits made pursuant to the provisions of this Section.

  

 58 

	14.10 	Debenture Trustee Not Ordinarily Bound 

  
 Except as provided in Section 8.2 and as otherwise specifically provided herein, the Debenture Trustee shall not, subject to Section 14.3, be bound to
give notice to any person of the execution hereof, nor to do, observe or perform or see to the observance or performance by the Corporation of any of the obligations herein imposed upon the Corporation or of the covenants on the part of the
Corporation herein contained, nor in any way to supervise or interfere with the conduct of the Corporation’s business, unless the Debenture Trustee shall have been required to do so in writing by the holders of not less than 25% of the
aggregate principal amount of the Debentures then outstanding or by any Extraordinary Resolution of the Debentureholders passed in accordance with the provisions contained in Article 12, and then only after it shall have been funded and indemnified
to its satisfaction against all actions, proceedings, claims and demands to which it may render itself liable and all costs, charges, damages and expenses which it may incur by so doing. 
  

	14.11 	Debenture Trustee Not Required to Give Security 

  
 The Debenture Trustee shall not be required to give any bond or security in respect of the execution of the trusts and powers of this Indenture or
otherwise in respect of the premises. 
  

	14.12 	Debenture Trustee Not Bound to Act on Corporation’s Request 

  
 Except as in this Indenture otherwise specifically provided, the Debenture Trustee shall not be bound to act in accordance with any direction or request
of the Corporation or of the trustee until a duly authenticated copy of the instrument or resolution containing such direction or request shall have been delivered to the Debenture Trustee, and the Debenture Trustee shall be empowered to act upon
any such copy purporting to be authenticated and believed by the Debenture Trustee to be genuine. 
  

	14.13 	Conditions Precedent to Debenture Trustee’s Obligations to Act Hereunder 

  
 The obligation of the Debenture Trustee to commence or continue any act, action or proceeding for the purpose of enforcing
the rights of the Debenture Trustee and of the Debentureholders hereunder shall be conditional upon the Debentureholders furnishing when required by notice in writing by the Debenture Trustee, sufficient funds to commence or continue such act,
action or proceeding and indemnity reasonably satisfactory to the Debenture Trustee to protect and hold harmless the Debenture Trustee against the costs, charges and expenses and liabilities to be incurred thereby and any loss and damage it may
suffer by reason thereof. 
  
 None of the provisions contained in
this Indenture shall require the Debenture Trustee to expend or risk its own funds or otherwise incur financial liability in the performance of any of its duties under this Indenture or in the exercise of any of its rights or powers, shall it be so
compelled pursuant to any provision of this Indenture unless indemnified as aforesaid. 
  
 The Debenture Trustee may, before commencing or at any time during the continuance of any such act, action or proceeding require the Debentureholders at whose instance it is acting to deposit with the Debenture
Trustee the Debentures held by them for which Debentures the Debenture Trustee shall issue receipts. 
  

	14.14 	Authority to Carry on Business 

  
 The Debenture Trustee represents to the Corporation that at the date of execution and delivery by it of this Indenture it is authorized to carry on the
business of a trust company in the Province of Alberta but if, notwithstanding the provisions of this Section 14.14, it ceases to be so authorized to carry on business, the validity and enforceability of this Indenture and the securities issued
hereunder shall not be affected in any manner whatsoever by reason only of such event but the Debenture Trustee shall, within 90 days after ceasing to be authorized to carry on the business of trust company in the Province of Alberta, either become
so authorized or resign in the manner and with the effect specified in Section 14.2. 
  

 59 

	14.15 	Compensation and Indemnity 

  

	(a)	The Corporation shall pay to the Debenture Trustee from time to time compensation for its services hereunder as agreed separately by the Corporation and the Debenture Trustee, and
shall pay or reimburse the Debenture Trustee upon its request for all reasonable expenses, disbursements and advances incurred or made by the Debenture Trustee in the administration or execution of its duties under this Indenture (including the
reasonable and documented compensation and disbursements of its Counsel and all other advisers and assistants not regularly in its employ), both before any default hereunder and thereafter until all duties of the Debenture Trustee under this
Indenture shall be finally and fully performed. The Debenture Trustee’s compensation shall not be limited by any law on compensation of a trustee of an express trust. 

  

	(b)	The Corporation hereby indemnifies and saves harmless the Debenture Trustee and its directors, officers and employees from and against any and all loss, damages, charges, expenses,
claims, demands, actions or liability whatsoever which may be brought against the Debenture Trustee or which it may suffer or incur as a result of or arising out of the performance of its duties and obligations hereunder save only in the event of
the negligent failure to act, or the wilful misconduct or bad faith of the Debenture Trustee. This indemnity will survive the termination or discharge of this Indenture and the resignation or removal of the Debenture Trustee. The Debenture Trustee
shall notify the Corporation promptly of any claim for which it may seek indemnity. The Corporation shall defend the claim and the Debenture Trustee shall co-operate in the defence. The Debenture Trustee may have separate counsel and the Corporation
shall pay the reasonable fees and expenses of such Counsel. The Corporation need not pay for any settlement made without its consent, which consent must not be unreasonably withheld. This indemnity shall survive the resignation or removal of the
Debenture Trustee or the discharge of this Indenture. 

  

	(c)	The Corporation need not indemnify against any loss or liability incurred by the Debenture Trustee through negligence or bad faith or material breach of the Debenture Trustee’s
material duties hereunder. 

  

	14.16 	Acceptance of Trust 

  
 The Debenture Trustee hereby accepts the trusts in this Indenture declared and provided for and agrees to perform the same upon the terms and conditions
herein set forth and to hold all rights, privileges and benefits conferred hereby and by law in trust for the various persons who shall from time to time be Debentureholders, subject to all the terms and conditions herein set forth. 
  

	(a)	The Debenture Trustee shall not be responsible or liable in any manner whatever for the sufficiency, correctness, genuineness or validity of any security deposited with it.

  

	(b)	The Debenture Trustee shall not be liable for any error in judgement or for any act done or step taken or omitted by it in good faith or for any mistake, in fact or law, or for
anything which it may do or refrain from doing in connection herewith except arising out of its own negligence or wilful misconduct. 

  

	(c)	The Debenture Trustee will disburse monies according to this Agreement only to the extent that monies have been deposited with it. 

  

	(d)	The duties and obligations of the Debenture Trustee shall be determined solely by the provisions hereof and, accordingly, the Debenture Trustee shall not be responsible except for
the performance of such duties and obligations as it has undertaken herein. 

  
 The Debenture Trustee shall not be bound to give any notice or do or take any act, action or proceeding by virtue of the powers conferred on it hereby unless and until it shall have been required to do so under the
terms hereof; nor shall the Debenture Trustee be required to take notice of any default hereunder, unless and until notified in writing of such default, which notice shall distinctly specify the default desired to be brought to the attention of the
Debenture Trustee and in the absence of any such notice the Debenture Trustee may for all purposes of this Indenture conclusively assume that no default has been made in the observance or performance of any of the 

  

 60 

 
representations, warranties, covenants, agreements or conditions contained herein. Any such notice shall in no way limit any discretion herein given to the
Debenture Trustee to determine whether or not the Debenture Trustee shall take action with respect to any default. 
  
 ARTICLE 15 
 SUPPLEMENTAL INDENTURES 
  

	15.1	Supplemental Indentures 

  
 From time to time the Debenture Trustee and, when authorized by a resolution of the directors of the Corporation, the Corporation, may, and they shall
when required by this Indenture, subject to the prior written approval of the Toronto Stock Exchange, execute, acknowledge and deliver by their proper officers deeds or indentures supplemental hereto which thereafter shall form part hereof, for any
one or more of the following purposes: 
  

	(a)	providing for the issuance of Additional Debentures under this Indenture; 

  

	(b)	adding to the covenants of the Corporation herein contained for the protection of the Debentureholders, or of the Debentures of any series, or providing for events of default, in
addition to those herein specified; 

  

	(c)	making such provisions not inconsistent with this Indenture as may be necessary or desirable with respect to matters or questions arising hereunder, including the making of any
modifications in the form of the Debentures which do not affect the substance thereof and which in the opinion of the Debenture Trustee relying on an opinion of Counsel will not be prejudicial to the interests of the Debentureholders;

  

	(d)	evidencing the succession, or successive successions, of others to the Corporation and the covenants of and obligations assumed by any such successor in accordance with the
provisions of this Indenture; 

  

	(e)	giving effect to any Extraordinary Resolution passed as provided in Article 12; and 

  

	(f)	for any other purpose not inconsistent with the terms of this Indenture. 

  
 Unless the supplemental indenture requires the consent or concurrence of Debentureholders or the holders of a particular series of Debentures, as the case
may be, by Extraordinary Resolution, the consent or concurrence of Debentureholders or the holders of a particular series of Debentures, as the case may be, shall not be required in connection with the execution, acknowledgement or delivery of a
supplemental indenture. The Corporation and the Debenture Trustee may amend any of the provisions of this Indenture related to matters of United States or Canadian law or the issuance of Debentures into the United States or Canada in order to ensure
that such issuances can be properly done in accordance with applicable law in the United States or Canada without the consent or approval of the Debentureholders. Further, the Corporation and the Debenture Trustee may without the consent or
concurrence of the Debentureholders or the holders of a particular series of Debentures, as the case may be, by supplemental indenture or otherwise, make any changes or corrections in this Indenture which it shall have been advised by Counsel are
required for the purpose of curing or correcting any ambiguity or defective or inconsistent provisions or clerical omissions or mistakes or manifest errors contained herein or in any indenture supplemental hereto or any Written Direction of the
Corporation provided for the issue of Debentures, providing that in the opinion of the Debenture Trustee (relying upon an opinion of Counsel) the rights of the Debentureholders are in no way prejudiced thereby. 
  

 61 

 ARTICLE 16 
 EXECUTION AND FORMAL DATE 
  

	16.1	Execution 

  
 This Indenture may be simultaneously executed in several counterparts, each of which when so executed shall be deemed to be an original and such
counterparts together shall constitute one and the same instrument. 
  

	16.2	Formal Date 

  
 For the purpose of convenience this Indenture may be referred to as bearing the formal date of November 12, 2004 irrespective of the actual date of
execution hereof. 
  

	16.3	Counterparts 

  
 This Indenture may be executed in original or by facsimile in any number of counterparts, each of which shall be deemed to be an original, and together
the counterparts shall constitute one complete document. 
  
 IN
WITNESS whereof the parties hereto have executed these presents under their respective corporate seals and the hands of their proper officers in that behalf. 
  

					
	GASTAR EXPLORATION LTD.
		
	By:	 	“J. RUSSELL PORTER”
	 	 	 Title:
	 	 

  

					
	CIBC MELLON TRUST COMPANY
		
	By:	 	“ROGER BOOTH”
	 	 	 Title:
	 	 
		
	By:	 	“NORMA BLASETTI”
	 	 	 Title:
	 	 

  

 62 

  
 SCHEDULE “A”

  
 TO THE TRUST INDENTURE BETWEEN GASTAR EXPLORATION LTD. AND
CIBC MELLON TRUST COMPANY 
  
 FORM OF DEBENTURE 

 

			
	No.·	 	US$·

  
 GASTAR EXPLORATION
LTD. 
  
 (A corporation existing under the
Business Corporations Act (Alberta)) 
  
 9.75% CONVERTIBLE SENIOR UNSECURED SUBORDINATED DEBENTURE 
 due NOVEMBER 20, 2009 
  
 GASTAR EXPLORATION LTD. (the “Corporation”) for value
received hereby acknowledges itself indebted and, subject to the provisions of the trust indenture (the “Indenture”) dated as of November 12, 2004 between the Corporation and CIBC Mellon Trust Company (the “Debenture
Trustee”), promises to pay to the registered holder hereof, on November 20, 2009 (the “Maturity Date”) or on such earlier date as the principal amount hereof may become due in accordance with the provisions of the
Indenture, the principal sum of · US Dollars (US$·) on presentation and surrender of this Debenture at the main branch of the Debenture Trustee in Calgary, Alberta in accordance with the terms of the Indenture and, subject as hereinafter provided, to pay interest on the principal amount
hereof from the date hereof, or from the last Interest Payment Date to which interest shall have been paid or made available for payment hereon, whichever is later, at the rate of 9.75% per annum, in like money, in arrears in quarterly instalments
(less any tax required by law to be deducted) on February 12, May 12, August 12 and November 12 in each year commencing on February 12, 2005, and provided that the last payment (representing interest payable from the last Interest Payment Date to,
but excluding, the Maturity Date) shall fall due on the Maturity Date and, should the Corporation at any time make default in the payment of any principal or interest, to pay interest on the amount in default at the same rate, in like money and on
the same dates. For certainty, the first interest payment will include interest accrued from November 12, 2004 to, but excluding, February 12, 2005, which will be equal to US$24.58 for each US$1,000 principal amount of the Initial Debentures.

  
 All payments of interest on this Debenture (less any tax
required to be withheld therefrom) shall be made by certified cheque, bank draft or electronic transfer of funds made payable to the registered holder hereof. 
  

This Debenture is one of the 9.75% Convertible Senior Unsecured Subordinated Debentures (referred to herein as “Initial Debentures”)
of the Corporation issued or issuable in one or more series under the provisions of the Indenture. The Initial Debentures authorized for issue immediately are limited to an aggregate principal amount of US$30,000,000. Reference is hereby expressly
made to the Indenture for a description of the terms and conditions upon which the Debentures are or are to be issued and held and the rights and remedies of the holders of the Debentures and of the Corporation and of the Debenture Trustee, all to
the same effect as if the provisions of the Indenture were herein set forth to all of which provisions the holder of this Debenture by acceptance hereof assents. To the extent that the terms and conditions stated in this Debenture conflict with the
provisions of the Indenture, the provisions of the Indenture shall prevail. 
  
 The Initial Debentures are issuable only in denominations of US$1,000 and integral multiples thereof. Upon compliance with the provisions of the Indenture, Debentures of any denomination may be exchanged for an equal
aggregate principal amount of Debentures in any other authorized denomination or denominations. 
  
 Any part, being US$1,000 or an integral multiple thereof, of the principal of this Debenture, provided that the principal amount of this Debenture is in a
denomination in excess of US$1,000, is convertible, at the option of the holder hereof, upon surrender of this Debenture at the principal office of the Debenture Trustee in Calgary, Alberta, at any time prior to the close of business on the last
Business Day immediately preceding the Maturity Date or, if this Debenture is called for redemption on or prior to such date, then up to but not after the close 

  

 A-1 

 
of business on the last Business Day immediately preceding the date specified for redemption of this Debenture, into the nearest whole number of Common
Shares (without adjustment for interest accrued hereon or for dividends or distributions on Common Shares issuable upon conversion) calculated by dividing the principal amount of Debentures presented for conversion by the initial conversion price of
US$4.62 (the “Conversion Price”) per Common Share, all subject to the terms and conditions and in the manner set forth in the Indenture. The Indenture makes provision for the adjustment of the Conversion Price in the events therein
specified, including that in the event the Liquidity Event has not occurred on or prior to (i) March 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.54, (ii) May 12, 2005, the Conversion Price shall be automatically
adjusted to equal US$4.46, and (iii) July 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.38; provided that the foregoing automatic adjustments shall be immediately further adjusted to reflect any Conversion Price
adjustments required by Section 6.5 of the Indenture made prior to such automatic adjustment. No fractional Common Shares will be issued on any conversion but in lieu thereof, the Corporation will satisfy such fractional interest by a cash payment
equal to the market price of such fractional interest determined in accordance with the Indenture. Holders converting their Debentures will receive accrued and unpaid interest thereon up to but not including the Conversion Date. Subject to the
provisions of Article 6 of the Indenture, no adjustment in the number of Common Shares to be issued upon conversion (but as yet unissued) will be made for distributions or dividends on Common Shares issuable upon conversion or for interest accrued
on Initial Debentures surrendered for conversion. 
  
 This
Debenture may be redeemed at the option of the Corporation on the terms and conditions set out in the Indenture at the redemption price therein and herein set out provided that this Debenture is not redeemable on or before November 12, 2006, except
in the event of the satisfaction of certain conditions after a Change of Control has occurred. After November 12, 2006 and on or prior to maturity, this Debenture is not redeemable unless the Corporation shall file with the Debenture Trustee on the
day that notice of redemption of this Initial Debenture is first given, an Officer’s Certificate of the Corporation certifying that the U.S. Currency Equivalent of the weighted average price of the Common Shares on the Toronto Stock Exchange
(or elsewhere in accordance with the Indenture) for 20 consecutive trading days selected by the Corporation in any consecutive 30 day period ending on the fifth trading day preceding the date on which such notice is given, is at least 130% of the
Conversion Price then in effect. 
  
 Upon the occurrence of a
Change of Control of the Corporation, the Corporation is required to make an offer (a “Change of Control Offer”) to purchase all of the Initial Debentures at a price equal to the Offer Price set forth in the Indenture plus accrued
and unpaid interest up to, but excluding, the date the Initial Debentures so repurchased. If 90% or more of the principal amount of all Debentures outstanding on the date the Corporation provides notice of a Change of Control to the Debenture
Trustee have been tendered for purchase pursuant to the Change of Control Offer, the Corporation has the right to and shall redeem all the remaining outstanding Initial Debentures on the same date and at the same price. 
  
 If an offer (an “Offer”) to acquire all outstanding
Debentures is made and 90% or more of the principal amount of all the Initial Debentures (other than Initial Debentures held at the date of the Offer by or on behalf of the Offeror, Associates or Affiliates of the Offeror or anyone acting jointly or
in concert with the Offeror) are taken up and paid for by the Offeror, the Offeror will be entitled to acquire the Initial Debentures of those holders who did not accept the Offer on the same terms as the Offeror acquired the first 90% of the
principal amount of the Initial Debentures. 
  
 The indebtedness
evidenced by this Debenture, and by all other Initial Debentures now or hereafter certified and delivered under the Indenture, is a direct unsecured obligation of the Corporation, and is subordinated in right of payment, to the extent and in the
manner provided in the Indenture, to the prior payment of all Senior Indebtedness, whether outstanding at the date of the Indenture or thereafter created, incurred, assumed or guaranteed. 
  
 The principal hereof may become or be declared due and payable before the stated maturity in the events, in the manner, with
the effect and at the times provided in the Indenture. 
  
 The
Indenture contains provisions making binding upon all holders of Debentures outstanding thereunder (or in certain circumstances specific series of Debentures) resolutions passed at meetings of such holders held in accordance with such provisions and
instruments signed by the holders of a specified majority of Debentures 

 
outstanding (or specific series), which resolutions or instruments may have the effect of amending the terms of this Initial Debenture or the Indenture.

  
 The Indenture contains provisions disclaiming any personal
liability on the part of holders of Common Shares, officers or agents of the Corporation in respect of any obligation or claim arising out of the Indenture or this Debenture. 
  
 This Debenture may only be transferred, upon compliance with the conditions prescribed in the Indenture, in one of the
registers to be kept at the principal office of the Debenture Trustee in the City of Calgary and in such other place or places and/or by such other registrars (if any) as the Corporation with the approval of the Debenture Trustee may designate. No
transfer of this Debenture shall be valid unless made on the register by the registered holder hereof or his executors or administrators or other legal representatives, or his or their attorney duly appointed by an instrument in form and substance
satisfactory to the Debenture Trustee or other registrar, and upon compliance with such reasonable requirements as the Debenture Trustee and/or other registrar may prescribe and upon surrender of this Debenture for cancellation. Thereupon a new
Initial Debenture or Initial Debentures in the same aggregate principal amount shall be issued to the transferee in exchange hereof. 
  
 This Debenture shall not become obligatory for any purpose until it shall have been certified by the Debenture Trustee under the Indenture. 
  
 Capitalized words or expressions used in this Debenture shall, unless
otherwise defined herein, have the meaning ascribed thereto in the Indenture. 
  
 IN WITNESS WHEREOF GASTAR EXPLORATION LTD. has caused this Debenture to be signed by its authorized representatives as of the 12th day of November, 2004. 
  

			
	GASTAR EXPLORATION LTD.
		
	 By:
	 	 
	 	 	 

 DEBENTURE TRUSTEE’S CERTIFICATE 
  
 This Debenture is one of the 9.75% Convertible Senior Unsecured Subordinated Debentures due November 20, 2009 referred to in
the Indenture within mentioned. 
  

			
	CIBC MELLON TRUST COMPANY
		
	By:	 	 
	 	 	(Authorized Officer)

  
 REGISTRATION PANEL

  
 (No writing hereon except by Debenture Trustee or other
registrar) 
  

					
	 Date of Registration

	 	 In Whose Name Registered

	 	 Signature of Debenture Trustee or
 Registrar

	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 

  

 A-4 

 FORM OF ASSIGNMENT 
  
 FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto
                                        
                    , whose address and social insurance number or social security number, if applicable, are set forth below, this Debenture (or
US$                         principal amount hereof*) of GASTAR EXPLORATION LTD., standing in the name(s) of the
undersigned in the register maintained by the Corporation with respect to such Debenture and does hereby irrevocably authorize and direct the Debenture Trustee to transfer such Debenture in such register, with full power of substitution in the
premises. 
  

			
	Dated:	  	 

  

			
	Address of Transferee:	  	 
	 	  	(Street Address, City, Province and Postal Code)

  

			
	Social Insurance Number or Social Security Number of Transferee, if applicable: 	  	 

  

	*	If less than the full principal amount of the within Debenture is to be transferred, indicate in the space provided the principal amount (which must be US$1,000 or an integral
multiple thereof, unless you hold a Debenture in a non-integral multiple of US$1,000 by reason of your having exercised your right to exchange upon the making of an Offer, in which case such Initial Debenture is transferable only in its entirety) to
be transferred. 

  

	1.	The signature(s) to this assignment must correspond with the name(s) as written upon the face of this Debenture in every particular without alteration or any change whatsoever. The
signature(s) must be guaranteed by a Canadian chartered bank or by a member of an acceptable Medallion Guarantee Program. Notarized or witnessed signatures are not acceptable as guaranteed signatures. The Guarantor must affix a stamp bearing the
actual words: “SIGNATURE GUARANTEED”. 

  

	2.	The registered holder of this Debenture is responsible for the payment of any documentary, stamp or other transfer taxes that may be payable in respect of the transfer of this
Debenture. 

  

	3.	Persons signing in a representative capacity may be required to provide proof of their authority to act. 

  
 Signature of Guarantor: 
  

					
			
	  	 	 	 	  
	Authorized Officer	 	 	 	Signature of transferring registered holder
			
	  	 	 	 	  
	Name of Institution	 	 	 	Name of Holder (Please print)
			
	 	 	 	 	  
	 	 	 	 	Capacity of Authorized Representative

  

 A-5 

 CONVERSION NOTICE 
  

	TO:	 GASTAR EXPLORATION LTD. 

  

	Note: 	All capitalized terms used herein have the meaning ascribed thereto in the Indenture mentioned below, unless otherwise indicated. 

  
 The undersigned registered holder of 9.75% Convertible Senior Unsecured
Subordinated Debentures bearing Certificate No.
                                        
     irrevocably elects to convert such Debentures (or
US$                                       
      principal amount thereof*) in accordance with the terms of the Indenture referred to in such Debentures and tenders herewith the Debentures, and, if applicable, directs that the Common Shares of Gastar Exploration
Ltd. issuable upon a conversion be issued and delivered to the person indicated below. (If Common Shares are to be issued in the name of a person other than the holder, all requisite transfer taxes must be tendered by the undersigned). 

 

							
				
	Dated:	 	  	 	 	 	  
	 	 	 	 	 	 	(Signature of Registered Holder)

  

	*	If less than the full principal amount of the Debentures, indicate in the space provided the principal amount (which must be US$1,000 or integral multiples thereof).

  

	NOTE:  	If Common Shares are to be issued in the name of a person other than the holder, the signature must be guaranteed by a Canadian Schedule 1 chartered bank, a major Canadian trust
company or by a member of an acceptable Medallion Guarantee Program. The Guarantor must affix a stamp bearing the actual words: “SIGNATURE GUARANTEED”. 

  
 (Print name in which Common Shares are to be issued, delivered and registered) 
  

			
		
	Name:	 	 

			
	
	 
	(Address)
	
	 
	(City, Province and Postal Code)
		
	Name of guarantor:	 	 

			
		
	Authorized signature:	 	 

  

 A-6 

 SCHEDULE “B” 
  
 TO THE TRUST INDENTURE BETWEEN GASTAR EXPLORATION LTD. AND CIBC MELLON TRUST COMPANY 
  
 GASTAR EXPLORATION LTD. 
  
 9.75% CONVERTIBLE SENIOR UNSECURED SUBORDINATED DEBENTURES 

 
 REDEMPTION NOTICE 
  

	To: 	Holders of 9.75% Convertible Senior Unsecured Subordinated Debentures (the “Debentures”) of Gastar Exploration Ltd. (the “Corporation”)

  

	Note: 	All capitalized terms used herein have the meaning ascribed thereto in the Indenture mentioned below, unless otherwise indicated. 

  
 Notice is hereby given pursuant to Section 4.3 of the trust indenture (the
“Indenture”) dated as of November 12, 2004 between the Corporation and CIBC Mellon Trust Company (the “Debenture Trustee”), that the aggregate principal amount of US$· of the US$· of Debentures outstanding will be redeemed as of · (the “Redemption Date”), upon payment of a redemption amount of US$· for each US$1,000 principal amount of Debentures, being equal to the aggregate of (i) US$· (the
“Redemption Price”), and (ii) all accrued and unpaid interest hereon to but excluding the Redemption Date (collectively, the “Total Redemption Price”). 
  
 The Total Redemption Price will be payable upon presentation and surrender of the Debentures called for redemption at the
following corporate trust office: 
  
 CIBC Mellon Trust Company

 600, 333 – 7th Avenue SW 
 Calgary, AB T2P 2Z1 
 Attention: Robert Inkster 
  
 The
interest upon the principal amount of Debentures called for redemption shall cease to be payable from and after the Redemption Date, unless payment of the Total Redemption Price shall not be made on presentation for surrender of such Debentures at
the above-mentioned corporate trust office on or after the Redemption Date or prior to the setting aside of the Total Redemption Price pursuant to the Indenture. 
  
 DATED: 
  

	
	GASTAR EXPLORATION LTD.
	
	  
	(Authorized Director or Officer)

  

 B-1 

 SCHEDULE “C” 
  
 TO THE TRUST INDENTURE BETWEEN GASTAR EXPLORATION LTD. AND CIBC MELLON TRUST COMPANY 
  
 FORM OF DECLARATION FOR REMOVAL OF LEGEND 
  

	TO: 	CIBC Mellon Trust Company, as trustee and registrar of the 9.75% Convertible Senior Unsecured Subordinated Debentures and Common Shares of Gastar Exploration Ltd.

  
 The undersigned (a) acknowledges that the sale
of the securities of Gastar Exploration Ltd. (the “Corporation”) to which this declaration relates is being made in reliance on Rule 904 of Regulation S under the United States Securities Act of 1933, as amended (the “1933
Act”) and (b) certifies that (1) it is not an affiliate of the Corporation (as defined in Rule 405 under the 1933 Act), (2) the offer of such securities was not made to a person in the United States, and either (A) at the time the buy order was
originated, the buyer was outside the United States, or the seller and any person acting on its behalf reasonably believe that the buyer was outside the United States, or (B) the transaction was executed on or through the facilities of the Toronto
Stock Exchange and neither the seller nor any person acting on its behalf knows that the transaction has been prearranged with a buyer in the United States, (3) neither the seller nor any affiliate of the seller nor any person acting on any of their
behalf has engaged or will engage in any directed selling efforts in the United States in connection with the offer and sale of such securities, (4) the sale is bona fide and not for the purpose of “washing off” the resale restrictions
imposed because the securities are “restricted securities” (as such term is defined in Rule 144(a)(3) under the 1933 Act), (5) the seller does not intend to replace the securities sold in reliance on Rule 904 of the 1933 Act with fungible
unrestricted securities, and (6) the contemplated sale is not a transaction, or part of a series of transactions which, although in technical compliance with Regulation S, is part of a plan or scheme to evade the registration provisions of the 1933
Act. Terms used herein have the meanings given to them by Regulation S. 
  

									
					
	Dated:	 	 	 	 	 	By:	 	 
					
	 	 	 	 	 	 	Name:	 	 
					
	 	 	 	 	 	 	Title:	 	 

	

  

 C-19.75% Convertible Senior Unsecured Subordinated Debenture

 EXHIBIT 4.2 
  

			
	No.                 	 	US$                

  
 GASTAR EXPLORATION
LTD. 
  
 (A corporation existing under the
Business Corporations Act (Alberta)) 
  
 9.75% CONVERTIBLE SENIOR UNSECURED SUBORDINATED DEBENTURE 
 due NOVEMBER 20, 2009 
  
 GASTAR EXPLORATION LTD. (the “Corporation”) for value
received hereby acknowledges itself indebted and, subject to the provisions of the trust indenture (the “Indenture”) dated as of November 12, 2004 between the Corporation and CIBC Mellon Trust Company (the “Debenture
Trustee”), promises to pay to the registered holder hereof, on November 20, 2009 (the “Maturity Date”) or on such earlier date as the principal amount hereof may become due in accordance with the provisions of the
Indenture, the principal sum of Ten Thousand US Dollars (US$10,000) on presentation and surrender of this Debenture at the main branch of the Debenture Trustee in Calgary, Alberta in accordance with the terms of the Indenture and, subject as
hereinafter provided, to pay interest on the principal amount hereof from the date hereof, or from the last Interest Payment Date to which interest shall have been paid or made available for payment hereon, whichever is later, at the rate of 9.75%
per annum, in like money, in arrears in quarterly instalments (less any tax required by law to be deducted) on February 12, May 12, August 12 and November 12 in each year commencing on February 12, 2005, and provided that the last payment
(representing interest payable from the last Interest Payment Date to, but excluding, the Maturity Date) shall fall due on the Maturity Date and, should the Corporation at any time make default in the payment of any principal or interest, to pay
interest on the amount in default at the same rate, in like money and on the same dates. For certainty, the first interest payment will include interest accrued from November 12, 2004 to, but excluding, February 12, 2005, which will be equal to
US$24.58 for each US$1,000 principal amount of the Initial Debentures. 
  
 All payments of interest on this Debenture (less any tax required to be withheld therefrom) shall be made by certified cheque, bank draft or electronic transfer of funds made payable to the registered holder hereof. 
  
 This Debenture is one of the 9.75% Convertible Senior Unsecured Subordinated
Debentures (referred to herein as “Initial Debentures”) of the Corporation issued or issuable in one or more series under the provisions of the Indenture. The Initial Debentures authorized for issue immediately are limited to an
aggregate principal amount of US$30,000,000. Reference is hereby expressly made to the Indenture for a description of the terms and conditions upon which the Debentures are or are to be issued and held and the rights and remedies of the holders of
the Debentures and of the Corporation and of the Debenture Trustee, all to the same effect as if the provisions of the Indenture were herein set forth to all of which provisions the holder of this Debenture by acceptance hereof assents. To the
extent that the terms and conditions stated in this Debenture conflict with the provisions of the Indenture, the provisions of the Indenture shall prevail. 
  
 The Initial Debentures are issuable only in denominations of US$1,000 and integral multiples thereof. Upon compliance with the provisions of the
Indenture, Debentures of any denomination may be exchanged for an equal aggregate principal amount of Debentures in any other authorized denomination or denominations. 

 Any part, being US$1,000 or an integral multiple thereof, of the principal of this Debenture, provided
that the principal amount of this Debenture is in a denomination in excess of US$1,000, is convertible, at the option of the holder hereof, upon surrender of this Debenture at the principal office of the Debenture Trustee in Calgary, Alberta, at any
time prior to the close of business on the last Business Day immediately preceding the Maturity Date or, if this Debenture is called for redemption on or prior to such date, then up to but not after the close of business on the last Business Day
immediately preceding the date specified for redemption of this Debenture, into the nearest whole number of Common Shares (without adjustment for interest accrued hereon or for dividends or distributions on Common Shares issuable upon conversion)
calculated by dividing the principal amount of Debentures presented for conversion by the initial conversion price of US$4.62 (the “Conversion Price”) per Common Share, all subject to the terms and conditions and in the manner set
forth in the Indenture. The Indenture makes provision for the adjustment of the Conversion Price in the events therein specified, including that in the event the Liquidity Event has not occurred on or prior to (i) March 12, 2005, the Conversion
Price shall be automatically adjusted to equal US$4.54, (ii) May 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.46, and (iii) July 12, 2005, the Conversion Price shall be automatically adjusted to equal US$4.38;
provided that the foregoing automatic adjustments shall be immediately further adjusted to reflect any Conversion Price adjustments required by Section 6.5 of the Indenture made prior to such automatic adjustment. No fractional Common Shares will be
issued on any conversion but in lieu thereof, the Corporation will satisfy such fractional interest by a cash payment equal to the market price of such fractional interest determined in accordance with the Indenture. Holders converting their
Debentures will receive accrued and unpaid interest thereon up to but not including the Conversion Date. Subject to the provisions of Article 6 of the Indenture, no adjustment in the number of Common Shares to be issued upon conversion (but as yet
unissued) will be made for distributions or dividends on Common Shares issuable upon conversion or for interest accrued on Initial Debentures surrendered for conversion. 
  
 This Debenture may be redeemed at the option of the Corporation on the terms and conditions set out in the Indenture at the
redemption price therein and herein set out provided that this Debenture is not redeemable on or before November 12, 2006, except in the event of the satisfaction of certain conditions after a Change of Control has occurred. After November 12, 2006
and on or prior to maturity, this Debenture is not redeemable unless the Corporation shall file with the Debenture Trustee on the day that notice of redemption of this Initial Debenture is first given, an Officer’s Certificate of the
Corporation certifying that the U.S. Currency Equivalent of the weighted average price of the Common Shares on the Toronto Stock Exchange (or elsewhere in accordance with the Indenture) for 20 consecutive trading days selected by the Corporation in
any consecutive 30 day period ending on the fifth trading day preceding the date on which such notice is given, is at least 130% of the Conversion Price then in effect. 
  
 Upon the occurrence of a Change of Control of the Corporation, the Corporation is required to make an offer (a
“Change of Control Offer”) to purchase all of the Initial Debentures at a price equal to the Offer Price set forth in the Indenture plus accrued and unpaid interest up to, but excluding, the date the Initial Debentures so
repurchased. If 90% or more of the principal amount of all Debentures outstanding on the date the Corporation provides notice of a Change of Control to the Debenture Trustee have been tendered for purchase pursuant to the Change of Control Offer,
the Corporation has the right to and shall redeem all the remaining outstanding Initial Debentures on the same date and at the same price. 
  
 If an offer (an “Offer”) to acquire all outstanding Debentures is made and 90% or more of the principal amount of all the Initial
Debentures (other than Initial Debentures held at the date of the Offer by or on behalf of the Offeror, Associates or Affiliates of the Offeror or anyone acting jointly or in concert with the Offeror) are taken up and paid for by the Offeror, the
Offeror will be entitled to acquire the Initial Debentures of those holders who did not accept the Offer on the same terms as the Offeror acquired the first 90% of the principal amount of the Initial Debentures. 
  
 The indebtedness evidenced by this Debenture, and by all other Initial
Debentures now or hereafter certified and delivered under the Indenture, is a direct unsecured obligation of the Corporation, and is subordinated in right of payment, to the extent and in the manner provided in the Indenture, to the prior payment of
all Senior Indebtedness, whether outstanding at the date of the Indenture or thereafter created, incurred, assumed or guaranteed. 
  
 The principal hereof may become or be declared due and payable before the stated maturity in the events, in the manner, with the effect and at the times
provided in the Indenture. 
  

 2 

 The Indenture contains provisions making binding upon all holders of Debentures outstanding thereunder
(or in certain circumstances specific series of Debentures) resolutions passed at meetings of such holders held in accordance with such provisions and instruments signed by the holders of a specified majority of Debentures outstanding (or specific
series), which resolutions or instruments may have the effect of amending the terms of this Initial Debenture or the Indenture. 
  
 The Indenture contains provisions disclaiming any personal liability on the part of holders of Common Shares, officers or agents of the Corporation in
respect of any obligation or claim arising out of the Indenture or this Debenture. 
  
 This Debenture may only be transferred, upon compliance with the conditions prescribed in the Indenture, in one of the registers to be kept at the principal office of the Debenture Trustee in the City of Calgary and
in such other place or places and/or by such other registrars (if any) as the Corporation with the approval of the Debenture Trustee may designate. No transfer of this Debenture shall be valid unless made on the register by the registered holder
hereof or his executors or administrators or other legal representatives, or his or their attorney duly appointed by an instrument in form and substance satisfactory to the Debenture Trustee or other registrar, and upon compliance with such
reasonable requirements as the Debenture Trustee and/or other registrar may prescribe and upon surrender of this Debenture for cancellation. Thereupon a new Initial Debenture or Initial Debentures in the same aggregate principal amount shall be
issued to the transferee in exchange hereof. 
  
 This Debenture
shall not become obligatory for any purpose until it shall have been certified by the Debenture Trustee under the Indenture. 
  
 Capitalized words or expressions used in this Debenture shall, unless otherwise defined herein, have the meaning ascribed thereto in the Indenture.

  

 3 

 IN WITNESS WHEREOF GASTAR EXPLORATION LTD. has caused this Debenture to be signed by its
authorized representatives as of the 24th day of June, 2005. 
  

			
	GASTAR EXPLORATION LTD.
		
	By:	 	 

  

 4 

 DEBENTURE TRUSTEE’S CERTIFICATE 
  
 This Debenture is one of the 9.75% Convertible Senior Unsecured Subordinated Debentures due November 20, 2009 referred to in
the Indenture within mentioned. 
  

			
	CIBC MELLON TRUST COMPANY
		
	By:	 	 
	 	 	(Authorized Officer)

  
 REGISTRATION PANEL

  
 (No writing hereon except by Debenture Trustee or other
registrar) 
  

					
	 Date of Registration

	 	 In Whose Name Registered

	 	 Signature of Debenture Trustee or
 Registrar

	 June 24, 2005
	 	 Nesbitt Burns ITF A/C 402 90012 96
 35th Floor, P.O. Box 150
 1 First
Canadian Place
 Toronto, ON M5X 1H3
	 	 

  

 5 

 FORM OF ASSIGNMENT 
  
 FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto
                                        
    , whose address and social insurance number or social security number, if applicable, are set forth below, this Debenture (or
US$                         principal amount hereof*) of GASTAR EXPLORATION LTD., standing in the name(s) of the
undersigned in the register maintained by the Corporation with respect to such Debenture and does hereby irrevocably authorize and direct the Debenture Trustee to transfer such Debenture in such register, with full power of substitution in the
premises. 
  

			
	Dated: 	 	 

			
		
	Address of Transferee: 	 	 
	 	 	 (Street Address, City, Province and Postal Code)

  

			
	Social Insurance Number or Social Security Number of Transferee, if applicable:	  	 

  

	*	If less than the full principal amount of the within Debenture is to be transferred, indicate in the space provided the principal amount (which must be US$1,000 or an integral
multiple thereof, unless you hold a Debenture in a non-integral multiple of US$1,000 by reason of your having exercised your right to exchange upon the making of an Offer, in which case such Initial Debenture is transferable only in its entirety) to
be transferred. 

  

	1.	The signature(s) to this assignment must correspond with the name(s) as written upon the face of this Debenture in every particular without alteration or any change whatsoever. The
signature(s) must be guaranteed by a Canadian chartered bank or by a member of an acceptable Medallion Guarantee Program. Notarized or witnessed signatures are not acceptable as guaranteed signatures. The Guarantor must affix a stamp bearing the
actual words: “SIGNATURE GUARANTEED”. 

  

	2.	The registered holder of this Debenture is responsible for the payment of any documentary, stamp or other transfer taxes that may be payable in respect of the transfer of this
Debenture. 

  

	3.	Persons signing in a representative capacity may be required to provide proof of their authority to act. 

  
 Signature of Guarantor: 
  

					
			
	  	 	 	 	  
	Authorized Officer	 	 	 	Signature of transferring registered holder
			
	  	 	 	 	  
	Name of Institution	 	 	 	Name of Holder (Please print)
			
	 	 	 	 	  
	 	 	 	 	Capacity of Authorized Representative

 CONVERSION NOTICE 
  

	TO:	GASTAR EXPLORATION LTD. 

  

	Note: 	All capitalized terms used herein have the meaning ascribed thereto in the Indenture mentioned below, unless otherwise indicated. 

  
 The undersigned registered holder of 9.75% Convertible Senior Unsecured
Subordinated Debentures bearing Certificate No.
                                        
     irrevocably elects to convert such Debentures (or
US$                                     principal amount
thereof*) in accordance with the terms of the Indenture referred to in such Debentures and tenders herewith the Debentures, and, if applicable, directs that the Common Shares of Gastar Exploration Ltd. issuable upon a conversion be issued and
delivered to the person indicated below. (If Common Shares are to be issued in the name of a person other than the holder, all requisite transfer taxes must be tendered by the undersigned). 
  

							
				
	Dated:	 	  	 	 	 	  
	 	 	 	 	 	 	(Signature of Registered Holder)

  

	*	If less than the full principal amount of the Debentures, indicate in the space provided the principal amount (which must be US$1,000 or integral multiples thereof).

  

	NOTE:  	If Common Shares are to be issued in the name of a person other than the holder, the signature must be guaranteed by a Canadian Schedule 1 chartered bank, a major Canadian trust
company or by a member of an acceptable Medallion Guarantee Program. The Guarantor must affix a stamp bearing the actual words: “SIGNATURE GUARANTEED”. 

  
 (Print name in which Common Shares are to be issued, delivered and registered) 
  

			
		
	Name:	 	 

			
	
	 
	(Address)
	
	 
	(City, Province and Postal Code)

			
		
	Name of guarantor:	 	 

			
		
	Authorized signature:	 	 

  

 7

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