Document:

Filed by Automated Filing Services Inc. (604) 609-0244 - Wildcat Silver Corp. - Exhibit 4.3

HARDSHELL ROYALTY AGREEMENT

THIS AGREEMENT is made and dated for reference the 18th day of
May, 2006

BETWEEN:

  
    
      
        ARIZONA MINERALS INC., a body corporate duly
          subsisting under the laws of the State of Nevada and having an office
          at 5903 Larch Street, Vancouver, British Columbia, V6M 4E5

        (“Grantor”)

      

    

  

OF THE FIRST PART

AND:

  
    
      
        DIAMOND HILL INVESTMENT CORP., a body corporate
          duly subsisting under the laws of British Columbia and having an office
          at 5903 Larch Street, Vancouver, British Columbia, V6M 4E5

        (“Grantee”)

      

    

  

OF THE SECOND PART

WHEREAS:

	A. 	
      Grantor is the beneficial owner and the recorded owner,
      of 100% right, title and interest in and to certain patented and
      unpatented claims located in the Harshaw Mining District, Santa Cruz
      County, Arizona, described in Schedule “A” hereto together with any
      successor or substitute title thereto (the “Property”);

	 	 
	B. 	
      In connection with the letter agreement among the Grantee
      and Comcorp Ventures Inc., dated February 22, 2006, it was acknowledged
      that the Grantor had granted to the Grantee, and its successors and
      assigns, out of the Grantor’s 100% interest in and to the Property, a net
      smelter return royalty from any production of minerals from the Property;
      and

	 	 
	C. 	
      The parties now wish to evidence their agreement and set
      forth their respective rights and obligations concerning the creation,
      calculation and payment of the royalty to the Grantee by the
    Grantor.

NOW THEREFORE WITNESSETH that in consideration of the mutual
covenants and agreements herein contained and other good and valuable
consideration and the sum of $10.00 now paid by the Grantee to the Grantor (the
receipt and sufficiency of which is acknowledged by each of the parties) and in
consideration of the premises and of the covenants herein contained, the parties
agree as follows:

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1.       
REPRESENTATIONS AND WARRANTIES

1.1      Each of the parties hereby
represents and warrants to the other that:

	 	(a) 	
      it is a company duly formed, organized and validly
      subsisting under the laws of its governing jurisdiction;

	 	 	 
	 	(b) 	
      it has full power and authority to carry on its business
      and to enter into this Agreement and any agreement or instrument referred
      to or contemplated by this Agreement;

	 	 	 
	 	(c) 	
      neither the execution and delivery of this Agreement nor
      any of the agreements referred to herein or contemplated hereby, nor the
      consummation of the transactions hereby contemplated conflict with, result
      in the breach of or accelerate the performance required by, any agreement
      to which it is a party;

	 	 	 
	 	(d) 	
      the execution and delivery of this Agreement and the
      agreements contemplated hereby will not violate or result in the breach of
      any laws of any jurisdiction applicable or pertaining thereto or of its
      constating documents; and

	 	 	 
	 	(e) 	
      the agreement is a legal, valid and binding obligation of
      each, subject to applicable bankruptcy and similar creditors’ remedies
      laws and the discretionary nature of equitable
remedies.

1.2       The Grantor represents
and warrants to the Grantee that:

	 	(a) 	
      the Grantor is the recorded and sole beneficial owner of
      all interest in the unpatented mineral claims comprised in the Property
      and such claims are accurately described in Part I of Schedule “A”, have
      been duly and validly laid out and monumented, are valid and subsisting
      mineral claims and are in good standing;

	 	 	 
	 	(b) 	
      the Grantor is the registered and sole beneficial owner
      of all interest in the patented mineral claims comprised in the Property,
      and such claims are accurately described in Part II of Schedule “A” are
      validly and subsisting mineral claims, and are in good standing;
  and

	 	 	 
	 	(c) 	
      no adverse claim to the title or interest of the Grantor
      of or in the Property has been asserted nor, to the knowledge of the
      Grantor, is there any basis therefor.

2.       
GRANT OF PRODUCTION ROYALTY

2.1       The Grantor hereby
creates and grants unto the Grantee, its successors and assigns for its and
their sole and only use forever, a royalty equal to the applicable percentage
hereinafter provided in subsection 2.2 of net smelter returns from all
production of Minerals, as hereafter defined, and the beneficiated products
thereof, from the Property (the “Royalty”) pursuant to the terms and provisions
of this Agreement.

- 3 -

2.2       The percentage of net
smelter returns to be paid as the Royalty to the Grantee during the term of this
agreement will be 2% of the net smelter returns (the “Percentage”):

3.      
 TERM

3.1       The term of this
Agreement shall be perpetual, it being the intent of the parties hereto that the
Royalty constitutes a burden on and covenant running with the land and affecting
the Property and all successions thereof whether created privately or through
governmental action including, without limitation, any leasehold interest. If
any right, power or interest of either party under this Agreement would violate
the rule against perpetuities, then such right, power or interest shall
terminate at the expiration of 20 years after the death of the last survivor of
all the lineal descendants of Her Majesty, Queen Elizabeth II of England, living
on the date of this Agreement.

4.       
MINERALS PRODUCTION ROYALTY

4.1       Royalty

The Grantor shall pay to the Grantee a Royalty equal to the
Percentage of Net Smelter Returns from the sale or other disposition of minerals
mined or otherwise recovered from the Property, as well as the beneficiated
products thereof (“Minerals”). “Net Smelter Returns” shall mean the gross
proceeds payable to the Grantor from the sale or other disposition of Minerals,
less the following expenses if actually incurred by the Grantor:

	 	(a) 	
      sales, use, gross receipts, severance taxes and mining
      taxes payable by the operator, if any, based directly upon and actually
      assessed against the value or quantity of Minerals sold or otherwise
      disposed of from the Property, but excluding any and all taxes (i) based
      upon the net or gross income of the Grantor or other operator of the
      Property, (ii) based upon the value of the Property, the privilege of
      doing business, and other similarly based taxes, and (iii) not based
      directly upon and actually assessed against the value or quantity of
      Minerals sold or otherwise disposed of from the Property; and

	 	 	 
	 	(b) 	
      charges and costs, if any, for transportation of doré or
      concentrates of the Minerals from the mill or other final processing plant
      on or near the Property to places where such doré or concentrates are
      smelted, refined and/or sold or otherwise disposed of; and

	 	 	 
	 	(c) 	
      charges, costs (including assaying, sampling and sales
      costs) and all penalties, if any, charged by a smelter or refiner of the
      doré or concentrates of the Minerals.

In the event smelting or refining are carried out in facilities
owned or controlled, in whole or in part, by the Grantor, then charges, costs
and penalties for such smelting or refining shall mean the amount the Grantor
would have incurred if such smelting or refining were carried out at facilities
not owned or controlled by the Grantor then offering comparable services for
comparable products on prevailing terms, but in no event greater than actual
costs incurred by the Grantor with respect to such smelting and refining.

- 4 -

4.2       Hedging
Transactions: Futures, Options and Other Trading

All profits and losses resulting from the Grantor engaging in
any commodity futures trading, option trading, metals trading, gold loans or any
combination thereof, and any other hedging transactions (collectively “hedging
transactions”) are specifically excluded from royalty calculations pursuant to
this Agreement. All hedging transactions by the Grantor and all profits or
losses associated therewith, if any, shall be solely for the Grantor’s account.
The amount of Royalty to be paid on all Minerals subject to hedging transactions
by the Grantor shall be determined pursuant to the provisions of this Section
4.2. As to Minerals subject to hedging transactions by the Grantor, Net Smelter
Returns shall be determined without reference to hedging transactions and shall
be determined by using for gold, the monthly average price of gold, which shall
be calculated by dividing the sum of all London Bullion Market Association P.M.
Gold Fix prices reported for the calendar quarter in question by the number of
days for which such prices were reported, and for silver, the monthly average
price of silver, which shall be calculated by dividing the sum of all New York
Commodity Exchange (“COMEX”) prices for silver quoted by and at the closing of
COMEX reported for the calendar quarter in question by the number of days for
which such prices were quoted.

4.3       Payment, Time and
Manner

The Royalty for each month will become due and payable by the
Grantor on the fourteenth day following the last day of the month in which the
same accrued. Upon 30 days’ written notice to do so by the Grantor, the Grantee
shall designate a “Payment Bank” located in either Vancouver or Toronto for
payment under this Section 4.3. If the Payment Bank (or any successor bank)
should fail, liquidate or be succeeded by another bank, or for any reason fail
or refuse to accept any payment, the Grantor shall not be held in default for
failure to make such payment until sixty (60) days after the Grantee has
notified the Grantor as required hereunder and the Grantee has advised the
Grantor of the name of another bank which will act as its agent to receive the
payments. The Grantee may, from time to time in its discretion, change the
Payment Bank by giving written notice thereof to the Grantor pursuant to Section
13.7 below. The Grantee may elect to receive the Royalty in respect of gold and
silver (“Precious Metals”) for each month either:

	 	(a) 	
      by converting the Royalty payable in cash to gold or
      silver bullion and delivery directly to the Grantee’s accounts maintained
      with the Payment Bank or other designated smelter, refiner or mint as
      directed by the Grantee; or

	 	 	 
	 	(b) 	
      by delivery of a certified cheque or bank draft payable
      to the Grantee at the Payment Bank.

In the event payment of the Royalty is converted to gold or
silver bullion, then the Royalty payable on silver shall be converted to the
gold equivalent of such silver by application of the provisions of Section 4.2.
To the extent that concentrates are being produced and sold from the Property
the Grantee hereby waives the right to convert the Royalty payable in cash to
product-in-kind in respect of such concentrates. In respect of all Minerals
other than Precious Metals, the Royalty shall be paid by delivery of a certified
cheque or bank draft payable to the Grantee at the Payment Bank.

- 5 -

4.4       Withholding
Taxes

The Grantee hereby authorizes the Grantor, if necessary, to
withhold from each and every payment of Royalty, all amounts as may be required
to be withheld pursuant to applicable taxation legislation; provided that the
Grantor and Grantee will co-operate as necessary to minimize any such required
withholding. All amounts withheld and remitted by the Grantor will be deemed to
have been paid to the Grantee on account of the Royalty payable.

4.5       Payment Accounting;
Disputes

All payments of the Royalty shall be accompanied by a detailed
statement (“Statement”) explaining the manner in which the payment was
calculated together with any available settlement sheets from the smelter,
refiner, other processor, purchaser or other user. All Royalty payments will be
considered final and in full satisfaction of all obligations of the Grantor with
respect thereto, unless the Grantee delivers to the Grantor a written notice
(“Objection Notice”) describing and setting forth a specific objection to the
calculation thereof within one hundred and twenty (120) days after the end of
the fiscal year in which such payment and statement was received by the Grantee.
If the Grantee objects to a particular Statement as herein provided, the Grantee
will, for a period commencing on the delivery of such Statement and ending upon
the day which is one hundred and eighty (180) days after the end of the fiscal
year of the Grantor in which the month covered by such Statement falls, have the
right, upon reasonable notice and at a reasonable time, to have the Grantor’s
accounts and records relating to the calculation of the Royalty in question
audited by the auditors of the Grantor. The Grantor will co-operate with and
provide all information requested by such auditors in respect of such audit. If
such audit determines that there has been a deficiency or an excess in the
payment made to the Grantee, such deficiency or excess will be resolved by
adjusting the next monthly Royalty payment due hereunder. The Grantee will pay
all the costs and expenses of such audit unless a deficiency of five (5%)
percent or more of the amount due is determined to exist. The Grantor will pay
the costs and expenses of such audit if a deficiency of five (5%) percent or
more of the amount due is determined to exist. Failure on the part of the
Grantee to make claim against the Grantor for adjustment in such one hundred and
twenty (120) day period by delivery of an Objection Notice will conclusively
establish the correctness and sufficiency of the Statement and Royalty payments
for such month, and forever preclude the filing of exceptions thereto or making
of claims for adjustment thereon by the Grantee, except in the case of
fraud.

4.6       Commingling

The Grantor shall provide to the Grantee 60 days written notice
before any Minerals from the Property are commingled with minerals from other
properties. Also, before any Minerals are commingled, the Minerals from the
Property shall be measured and sampled in accordance with sound mining and
metallurgical practices for moisture, metal, and other appropriate content.
Representative samples of the Minerals shall be retained by the Grantor and
assays (including penalty substances) and other appropriate analyses of these
samples shall be made before commingling to determine metal and other
appropriate content and penalty substances of the Minerals. From this
information, the Grantor shall determine the amount of Royalty due and payable
to the Grantee from Minerals from the Property commingled with minerals from
other properties. Following the expiration of the period for objection described
above in Section 4.5, 

- 6 -

and absent timely objection, if any, made by the Grantee, the
Grantor may dispose of the materials and data required to be kept and produced
by this Section 4.6.

5.       
BOOKS; RECORDS; INSPECTIONS; CONFIDENTIALITY

5.1       Books

The Grantor shall keep true and accurate books and records of
its operations and activities on the Property and under this Agreement. Such
books and records shall be kept on the accrual basis in accordance with
generally accepted accounting principles consistently applied. Not more
frequently than annually and, in addition to any audit requested under Section
4.5, the Grantee may, at its sole expense, perform an audit or other examination
of all of the Grantor’s books and records kept as required by this Agreement.
All financial information shall conclusively be deemed correct for purposes of
this Agreement unless the Grantee has given timely notice that it desires to
audit or examine the Grantor’s books and records as set forth above. The Grantee
shall promptly commence any such audits and shall diligently prosecute the same
to conclusion.

5.2       Reports

Within forty-five (45) days following the end of each calendar
year, the Grantor shall provide the Grantee with an annual report of all
activities and operations conducted upon or with respect to the Property during
the preceding calendar year. The Grantee acknowledges that while the Grantor
will use reasonable efforts to ensure that such data is complete, no
representation or warranty whatsoever, express or implied, is made with respect
to the accuracy or completeness of such data or the conclusions which the
Grantee may draw from such data.

5.3       Inspections

The Grantee or its authorized agents or representatives, on not
less than two (2) days’ notice to the Grantor, may enter upon all surface and
subsurface portions of the Property under the direction and control of the
Grantor (but only so as not to interfere with the Grantor’s activities on the
Property) for the purpose of inspecting the Property, all improvements thereto
and operations thereon, as well as inspecting and copying all records and data,
including without limitation such records and data which are maintained
electronically, pertaining to all activities and operations on or with respect
to the Property, improvements thereto and operations thereon. The Grantee or its
authorized agents or representatives shall enter the Property at its own risk
and expense and may not unreasonably hinder operations on or pertaining to the
Property. The Grantee shall indemnify and hold the Grantor, its affiliates and
their respective officers, directors, employees and agents harmless from any
damage, claim or demand by reason of injury to either the Grantee or any of its
agents or representatives caused by such Grantee’s exercise of its rights
herein.

5.4      
Confidentiality

The Grantee shall not, without the express written consent of
the Grantor, which consent shall not be unreasonably withheld, disclose any
information concerning the operations conducted on the Property or under this
Agreement, or issue any press releases concerning the operations of the
Grantor.

- 7 -

The Grantee may disclose data or information obtained under
this Agreement after providing the Grantor with a copy of the proposed
disclosure if the Grantor does not object to such disclosure by notice in
writing to the Grantee within one (1) business day of receipt of such copy:

	 	(a) 	
      if required for compliance with applicable laws, rules,
      regulations or orders of a governmental agency or stock exchange having
      jurisdiction over the Grantee or its parent or affiliated
    corporations;

	 	 	 
	 	(b) 	
      to any of the Grantee’s consultants;

	 	 	 
	 	(c) 	
      to any third party to whom the Grantee, in good faith,
      anticipates selling or assigning its interest hereunder; or

	 	 	 
	 	(d) 	
      to a prospective lender to whom an interest in Royalty
      payments to be made to the Grantee hereunder is proposed to be granted as
      security;

provided that, in each case, the Grantor shall first have been
provided with a confidentiality agreement executed by such consultant, third
party or lender, which agreement shall include the confidentiality provisions of
this Section 5.4. The Grantee will indemnify and save the Grantor harmless from
any loss, cost or liability (including, without limitation, reasonable
attorneys’ fees) resulting from any claim made by third parties receiving
information relating to the Property from the Grantee and provided by the
Grantor hereunder.

6.       
COMPLIANCE WITH LAWS; ENVIRONMENTAL OBLIGATIONS

6.1       Compliance with
Laws

The Grantor shall defend, indemnify and save the Grantee
harmless from any loss, cost or liability (including, without limitation,
reasonable attorneys’ fees) arising from any failure by the Grantor to at all
times comply with all applicable present or future federal, state and local
laws, statutes, rules, regulations, permits, ordinances, certificates, licenses
and other regulatory requirements, policies and guidelines relating to the
Grantor’s operations and activities on or with respect to the Property;
provided, however, the Grantor shall have the right to contest any of the same
if such contest does not jeopardize the Property or the Grantee’s respective
rights thereto or under this Agreement.

6.2       Reclamation;
Environmental Obligations

The Grantor shall indemnify and save the Grantee harmless from
any loss, cost or liability (including, without limitation, reasonable
attorneys’ fees) arising from any failure by the Grantor:

	 	(a) 	
      to timely and fully perform all reclamation required by
      all governmental authorities pertaining or related to the Grantor’s
      operations or activities on or with respect to the Property or required
      under this Agreement; or

	 	 	 
	 	(b) 	
      to undertake, cause, suffer, or permit any condition or
      activity at, on or in the vicinity of the Property which constitutes a
      nuisance; or

- 8 -

	 	(c) 	
      which results in a violation of or liability under any
      present or future applicable provincial, federal or local environmental
      laws, statutes, rules, regulations, permits, ordinances, certificates,
      licenses and other regulatory requirements, policies or
  guidelines.

7.       
STOCKPILING

7.1      The rights of the
Grantor to stockpile, store or place Minerals off the Property pursuant to any
of the provisions of this Agreement shall not be exercisable until the Grantor
has first secured from the property owner where such stockpiling, storage or
placement is to occur a written agreement in recordable form which provides that
the Grantee’s rights to the Minerals shall be preserved. Such agreement shall
provide, inter alia, that:

	 	(a) 	
      the Grantee’s rights pursuant to this Agreement, insofar
      as they are applicable, shall continue in full force and effect with
      respect to Minerals from the Property;

	 	 	 
	 	(b) 	
      the Grantee’s rights in and to the Minerals shall be the
      same as if the Minerals were situate on the Property;

	 	 	 
	 	(c) 	
      the Grantee’s rights set forth in this Section 7 shall
      have precedence over the rights to the Minerals of the property owner
      where the Minerals are stockpiled, stored or placed, as well as the
      creditors of the said property owner; and

	 	 	 
	 	(d) 	
      the agreement shall be irrevocable as long as Minerals
      from the Property, or any part thereof, remain on the property not part of
      the Property.

8.       
TAILINGS AND RESIDUES

8.1      All tailings and residues
resulting from the Grantor’s operations and activities on the Property shall be
the sole and exclusive property of the Grantor, but shall remain subject to the
Royalty should the same be processed in the future and result in the production
of Minerals.

9.       
MAINTENANCE OF PROPERTY

9.1      The Grantor shall do all
things and make all payments necessary or appropriate to maintain the right,
title and interest of the Grantor and the Grantee, respectively, in the Property
and shall provide proof that any such obligations have been satisfied to the
Grantee, not less than 30 days prior to the date by which such obligations must
be satisfied.

9.2       In the event that the
Grantor intends to abandon or otherwise surrender all or any part of the
unpatented claims comprised in the Property (the “Surrendered Claims”), it shall
deliver a notice in writing of its intention to do so to the Grantee at least
thirty (30) days prior to the proposed surrender, such notice to list the
proposed Surrendered Claims. If, within fifteen (15) days of receipt of such
notice, the Grantee delivers to the Grantor a notice (the “Reacquisition
Notice”) stating its desire to reacquire one or more of the Surrendered Claims,
the Grantor will deliver to the Grantee duly executed recordable transfers of
such of the Surrendered Claims as the Grantee has set forth in the Reacquisition
Notice.

- 9 -

10.      
 INSURANCE

10.1       The Grantor shall
purchase or otherwise arrange at its own expense and shall keep in force at all
times, directly or through the services of an independent contractor, insurance,
including but not limited to, the following:

10.1.1     Workers’ Compensation
Insurance

Workers’ compensation insurance or the like covering all
persons engaged in the performance of activities or operations as is required or
appropriate under the laws of the United States, Arizona or local governmental
bodies or agencies.

10.1.2     General Liability

Comprehensive general public liability insurance against claims
for bodily injury or death or property damage arising out of or resulting from
the Grantor’s activities or operations on or with respect to the Property, in
such amounts as will adequately protect the Grantor, the Grantee, the Royalty,
and the Property from any and all claims, liabilities and damages which may
arise with respect to this Agreement or the Property. Subject to a determination
that the Grantee has an insurable interest, the Grantee shall be named as a
co-insured.

11.       
CONDUCT OF OPERATIONS

11.1       All decisions
concerning methods, the extent, times, procedures and techniques of any
exploration, development, mining, leaching, milling, processing, extraction
treatment, if any, and the materials to be introduced into or onto the Property
or produced therefrom, and all decisions concerning the sale or other
disposition of Minerals (including, without limitation, decisions as to buyers,
times of sale, whether to store or stockpile Minerals for a reasonable length of
time without selling the same) shall be made by the Grantor in its sole and
absolute discretion.

11.2       The Grantor shall not
be responsible for nor be obliged to make Royalty payments for mineral values
lost in any mining or processing of Minerals conducted pursuant to customary
engineering practices. The Grantor shall not be required to mine or to preserve
or protect Minerals which under customary mining practices cannot be mined or
shipped at a reasonable profit by the Grantor at the time mined.

12.       
NO IMPLIED COVENANTS

12.1       The parties intend and
agree that no implied covenants or duties relating to exploration, development,
mining or the payment of production royalties or any other moneys provided for
herein shall affect any of their respective rights or obligations hereunder, and
that the only covenants or duties which affect such rights and obligations shall
be those expressly set forth and provided for in this Agreement. The Grantor
may, in its sole and absolute discretion, choose not to mine Minerals from the
Property. The Grantor shall be under no obligation whatsoever to place the
Property into commercial production and if the Property is placed into
commercial production, the Grantor shall have the sole and unfettered right at
any time to curtail or suspend commercial production as the Grantor deems
advisable.

- 10 -

13.       
GENERAL PROVISIONS

13.1       Additional
Documents; Registration of Interest

The parties shall execute all such further instruments and
documents and do all such further actions as may be necessary to effectuate the
purposes of this Agreement. The Grantee shall have the right from time to time
to register or record a deed of royalty or other notice of this Agreement, the
other instruments to which this Agreement relates, a notice of the Royalty, and
a caution or other title document against the title to the Property, and the
Grantor shall cooperate with such registration or recordation and provide its
written consent or signature to any documents or things necessary to accomplish
such registration or recordation.

13.2       Binding
Effect

All covenants, conditions, and terms of this Agreement shall be
of benefit to and run as a covenant with the Property and the ground covered
thereby and shall bind and inure to the benefit of the parties hereto, their
respective assigns and successors including, without limitation, partners, joint
venture partners, lessees and mortgages. All successors and assigns shall
succeed to all of the rights of their assignor under this Agreement. Nothing
herein shall be construed to create, expressly or by implication, a joint
venture, mining partnership, commercial partnership, or other partnership
relationship between the Grantor and the Grantee.

13.3       Entire
Agreement

This Agreement together with the attached Schedules contains
the entire agreement between the Grantor and the Grantee, and no oral agreement,
promise, statement or representation which is not contained herein and the
attached Schedules shall be binding on the parties unless subsequently reduced
to writing and signed by the parties. The provisions of this Agreement shall
supersede all previous oral or written agreements between the parties
hereto.

13.4       Governing
Law

This Agreement is to be governed by and construed under the
laws of Arizona, and the parties hereby attorn to the jurisdiction of the courts
and arbitrators of that State. The venue for all proceedings hereunder will be
Tucson, Arizona.

13.5       Time of
Essence

Time is of essence in this Agreement.

13.6       Notice

13.6.1   Subject to the payment provisions of this
Agreement or any schedule hereto, all notices, designations or other documents
required or authorized by the terms of this Agreement shall be in writing and
shall be personally delivered or mailed in Canada by registered or certified
mail, postage prepaid, return receipt requested or telecopied in a manner which
confirms transmission to the recipient, addressed as follows:

- 11 -

	 	(a) 	
      if to the Grantor, at:

	 	 	 
	 		
      c/o Suite 400

	 		
      837 West Hastings Street 
Vancouver, British Columbia
      
V6C 3N6

	 	 	 
	 		
      Telecopy No.: (604) 687-1715

	 	 	 
	 	(b) 	
      if to the Grantee, at:

	 	 	 
	 		
      c/o 5903 Larch Street 
Vancouver, British Columbia
      
V6M 4E5

	 	 	 
	 		
      Telecopy No.: (604) 267-1149

13.6.2   Any of the parties may change its address
for notice by giving the other parties notice of such change in the manner
specified in this Section. Notices personally delivered shall be deemed made and
received on the date of such delivery. Notices given by mail in the manner
specified in section 13.7.1 shall be deemed to have been made, delivered and
received five days after the date of mailing. A notice telecopied in the manner
specified in Section 3.7.1 shall be deemed to have been made and received on the
first business day following the day on which it was sent.

13.7       Headings

The headings of all the sections in this Agreement are inserted
for convenience of reference only and shall not affect the construction
thereof.

13.8      
Severability

If any provision of this Agreement is wholly or partially
invalid, this Agreement shall be interpreted as if the invalid provision had not
been a part hereof so that the invalidity shall not affect the validity of the
remainder of the Agreement which shall be construed as if the Agreement had been
executed without the invalid portion. It is hereby declared to be the intention
of the parties that this Agreement would have been executed without reference to
any portion which may, for any reason, hereafter be declared or held
invalid.

13.9       Assignment

This Agreement may be assigned by the Grantor without the prior
consent of the Grantee in conjunction with the assignment by the Grantor of an
interest in all or part of the Property, subject to the assignee agreeing in
writing to assume and perform the obligations of the Grantor under this
Agreement. This Agreement may be assigned in whole, but not in part, by the
Grantee without the prior consent of the Grantor, upon written notice of the
assignment to the Grantor. Each of the parties will cooperate with the other in
connection with effecting, registering or recording any assignment made in
compliance with this Agreement.

- 12 -

IN WITNESS WHEREOF the parties hereto have executed this
Agreement as of the day and year first above written.

	  	) 	  
	The Corporate Seal of DIAMOND HILL 	) 	  
	INVESTMENT CORP. was hereunto 	) 	  
	affixed in the presence of: 	) 	  
	  	) 	  
	/s/ R. Stuart
      Angus	) 	  
	  	) 	  
	Authorized Signatory 	) 	  
	  	) 	c/s 
	  	) 	  
	Authorized Signatory 	) 	  
	  	  	  
	  	  	  
	  	) 	  
	The Corporate Seal of ARIZONA 	) 	  
	MINERALS INC. was hereunto affixed 	) 	  
	in the presence of: 	) 	  
	  	) 	  
	/s/ R. Stuart
      Angus	) 	  
	  	) 	  
	Authorized Signatory 	) 	  
	  	) 	c/s 
	  	) 	  
	Authorized Signatory 	) 	  

SCHEDULE “A” 

PART I: UNPATENTED MINERAL CLAIMS

Twenty-Six Unpatented Claims, Names/Nos.: Shell
1-20/51409-51428; Shell 44-49/51452-51457; aggregating approx. 486 acres

PART II: PATENTED MINERAL CLAIMS

The following patented mining claims are located in the Harshaw
Mining District, 
Santa Cruz County, Arizona and are described as
follows:

	Claim Name 	Recorded 
Patent
      

        Number 	Survey
      

        Number 	Santa Cruz County Records 	
Township and Range
      

T23S, R16E 
T23S, R16E 
T23S, R16E 
T23S, R16E
      
T23S, R16E 
T23S, R16E 
T23S, R16E 

T23S, R16E 
	
Camden Mine 
Camden No. 2 
Hardshell No. 1 
Hardshell No.
      15 
Hermosa 
Salvador 
Bluff 

Alta 	
1211192 
1211192 
1211192
      
1211192 
10278 
10614 
10279 

8635 	
4460 
4460 
4460 
4460 
499
      
498 
500 

Lot 38A 	
Doc. 25, page 30 
Doc. 25, page 31
      
Doc. 25, page 32 
Doc. 25, page 33 
Book 88, page 469 
Book
      88, page 482 
Book 88, page 467 
Deed of Mines Book 17, page 
213
    

	TOTAL OF EIGHT PATENTED MINING CLAIMS 	(Approx. 135 acres)Filed by Automated Filing Services Inc. (604) 609-0244 - Wildcat Silver Corp. - Exhibit 4.4

VOLUNTARY POOLING AGREEMENT 

THIS AGREEMENT, dated for reference May 18, 2006, is made: 

BETWEEN: 

WILDCAT SILVER CORPORATION., a
company existing
under the laws of British Columbia and having its head
office at
Suite 400, 837 West Hastings Street, Vancouver, British
Columbia,
V6C 3N9 

(the “Company”); 

AND: 

DIAMOND HILL INVESTMENT CORP., a
corporation duly
incorporated and validly subsisting under the laws of
British
Columbia, and having an office at 5903 Larch Street,
Vancouver,
British Columbia, V6M 4E5 

(the “Shareholder”); 

WHEREAS:

A. Pursuant to a share purchase agreement dated for reference
May 18, 2006 entered into between the Company and the Shareholder (the “Share
Purchase Agreement”) the Company issued to the Shareholder an aggregate of
22,500,000 Class “B” special warrants of the Company (the “Special Warrants”).

B. Each of the Special Warrants is exercisable to acquire one
common share in the capital of the Company (the “Shares”) for no additional
consideration, pursuant to the terms and conditions of the Share Purchase
Agreement and the certificates representing such Special Warrants. 

C. The Company and the Shareholder have agreed to restrict the
Special Warrants and the Shares from being disposed of by the Shareholder on the
terms and conditions of this Agreement.

D. Unless otherwise defined in this Agreement, all defined
terms used in this Agreement have the meaning assigned to them in the Share
Purchase Agreement. 

THEREFORE, the parties agree: 

	1. 	POOLING ARRANGEMENT 

1.1 The Shareholder agrees, effective as of the date of this
Agreement (the “Effective Date”), not to transfer, assign, option, dispose of,
pledge or encumber any interest in the Special 

- 2 - 

Warrants or the Shares (the “Restrictions on Disposition”) for
a period from the Effective Date to the Completion Date.

1.2 Subject to subsection 1.3 of this Agreement, in the period
from the Effective Date to the date which is 36 months following the Effective
Date, the Shares will be released from the Restrictions on Disposition to the
Shareholder in accordance with the release schedule set out in Schedule “A” to
this Agreement.

1.3 Notwithstanding subsection 1.2 of this Agreement, the
Shares will be released from the Restrictions on Disposition on the earlier of:

	 	(a) 	
      the day the Company completes, or has completed, a
      technical report in accordance with National Instrument 43-101, Standards
      of Disclosure for Mineral Projects, (“NI 43-101”) that identifies a
      measured, indicated or inferred mineral resource (as defined in NI 43-101)
      of at least 20,000,000 ounces of silver on the Property; and

	 	 	 
	 	(b) 	
      the day an independent arm’s length third party completes
      a takeover bid, or otherwise acquires, over 50% of the issued and
      outstanding shares of the Company.

1.4 Upon their release from the Restrictions on Disposition
pursuant to subsections 1.2 or 1.3 of this Agreement, the Shares will cease to
be governed or affected by this Agreement. 

1.5 During the period in which the Shares are subject to the
Restrictions on Disposition pursuant to this Agreement: 

	 	(a) 	
      the Shareholder may exercise all voting rights attached
      to the Shares held by the Shareholder;

	 	 	 
	 	(b) 	
      the Shares may be transferred to another person only if
      the Company’s board of directors has approved the transfer provided that
      any such transfer will only be effective if the transferee agrees to be
      bound by the terms of this Agreement and signifies such agreement by
      entering into a voluntary pooling agreement in respect of the shares that
      are to be transferred on the same terms as are contained in this
      Agreement.

1.6 The Company will conspicuously mark all certificates
representing the Shares with the following legend: 

“The shares represented by this
certificate are subject to a voluntary pooling agreement between the Company and
Diamond Hill Investment Corporation, dated May 18, 2006 (the “Agreement”), and
are subject to a hold period that expires on the earlier of <> [ the
date that is either 6, 12, 18, 24, 30 or 36 months following Effective Date]
and the day calculated pursuant to subsection 1.3 of the Agreement. 

- 3 - 

	2. 	AMENDMENT AND ASSIGNMENT

This Agreement may be amended only by a written agreement among
the parties to this Agreement. 

	3. 	FURTHER ASSURANCES 

The Company and the Shareholder will execute and deliver any
further documents and perform any acts necessary to carry out the intent of this
Agreement. 

	4. 	TIME 

Time is of the essence of this Agreement. 

	5. 	NOTICES 

All notices, documents and other communications (“Notices”)
required or permitted to be given to the parties to this Agreement shall be in
writing, and shall be addressed to the parties as follows or at such other
address as the parties may specify from time to time: 

	 	(a) 	
      the Company:

	 	 	 
	 		
      Wildcat Silver Corporation  

	 	 	400 – 837 West Hastings Street
	 	 	Vancouver, B.C.
	 		
      V6C 1S4

	 	 	 
	 		
      Attention: President

	 	 	Facsimile No.: (604) 687-1715
	 	 	 
	 	(b) 	
      the Shareholder:

	 	 	 
	 		
      Diamond Hill Investment Corp. 

	 	 	5903 Larch Street 
	 	 	Vancouver, B.C.
	 		
      V6M 4E5

	 	 	 
	 		
      Attention: President 

	 	 	Facsimile No.: (604) 267-1149

Notices must be delivered to the party to which notice is to be
given to the address above or to such other address as a party may by Notice to
the other parties advise. If Notice is delivered or transmitted by telecopier
during the normal business hours of the recipient, it will be deemed to be
received when delivered or sent by telecopier. If a Notice is delivered or
transmitted by telecopier outside of normal business hours of the recipient, it
will be deemed to be received at the commencement of normal business hours of
the recipient on the next business day. 

- 4 - 

	6. 	COUNTERPARTS 

This Agreement may be executed in two or more counterparts,
each of which will be deemed to be an original and all of which shall constitute
one agreement. 

	7. 	LANGUAGE 

Wherever a singular expression is used in this Agreement, that
expression is deemed to include the plural or the body corporate where required
by the context. 

	8. 	ENUREMENT 

This Agreement enures to the benefit of and is binding on the
parties and their successors and permitted assigns. 

	9. 	APPLICABLE LAW 

This Agreement is subject to and governed by the laws of
British Columbia and the parties irrevocably attorn to the non-exclusive
jurisdiction of the courts of British Columbia for the resolution of all
disputes arising under or in connection with this Agreement. 

	10. 	CONFLICTING AGREEMENTS

Where a provision of this Agreement conflicts or is
inconsistent with a provision of any other agreement to which either or both of
the Company and Diamond Hill are party, the terms of this Agreement will
supersede any such conflicting provision. 

IN WITNESS of this Agreement, the parties have executed and
delivered this Agreement as of the date given above. 

WILDCAT SILVER CORPORATION

“Donald B.
Clark”
_______________________________
Authorized Signatory 

DIAMOND HILL INVESTMENT CORP. 

“R. Stuart
Angus”
_______________________________
Authorized Signatory 

Schedule “A” to the Voluntary Pooling Agreement 

Release Schedule for 22,500,000 Shares 

Timed Release 

The appropriate percentages of the Shares (as set out below)
will be released on the later of: (i) the date of issuance of the Shares
pursuant to the exercise of the Special Warrants; and (ii) the release dates set
out below. 

	

RELEASE DATES 	Percentage of Total Shares to
      
be Released 
	Total Number of Shares to 
be
      Released 

	May 18, 2006 	10% of Shares 	2,250,000 
	         November 18,
      2006 	15% of Shares 	3,375,000 
	May 18, 2007 	15% of Shares 	3,375,000 
	         November 18,
      2007 	15% of Shares 	3,375,000 
	May 18, 2008 	15% of Shares 	3,375,000 
	         November 18,
      2008 	15% of Shares 	3,375,000 
	May 18, 2009 	15% of Shares 	3,375,000 
	TOTAL 	100% 	22,500,000

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