Document:

Interest Purchase Agreement, dated as of April 14, 2000

 Exhibit 10.7 
  
 INTEREST PURCHASE AGREEMENT 
  

This Interest Purchase Agreement (this “Agreement”) is made as of April 14, 2000, by and among OGLEBAY NORTON COMPANY, a Delaware corporation
(the “Buyer”), and JOHNSON MINING INC., a Delaware corporation, THE CARY MINING COMPANY INC., a Delaware corporation, and MICHIGAN MINERALS ASSOCIATES, INC., a Delaware corporation (each individually, a “Seller” and
collectively, “Sellers”), and MICHIGAN LIMESTONE OPERATIONS LIMITED PARTNERSHIP, a Delaware limited partnership (“MLO”). MLO and its two affiliates, MLO-Ohio Ltd., an Ohio limited liability company
(“MLO-Ohio”), and Michigan Equipment Leasing L.L.C., a Michigan limited liability company (“MEL”), are collectively referred to herein as the “Company.” 
  
 WHEREAS, Sellers desire to sell to Buyer, and Buyer desires to purchase from
Sellers, at the Closing (as hereinafter defined) (a) all of the general and limited partnership interests in MLO (the “Partnership Interests”), (b) all of the membership interests in MLO-Ohio (the “MLO-Ohio Membership
Interests”), and (c) all of the membership interests in MEL (the “MEL Membership Interests”), in accordance with the terms and conditions set forth in this Agreement. 
  
 NOW, THEREFORE, in consideration of the mutual covenants, representations,
warranties, and agreements set forth herein, and intending to be legally bound hereby, the parties hereby agree as follows: 
  
 ARTICLE I 
 DEFINITIONS

  
 1.1 Definitions. For convenience, certain terms
used in more than one part of this Agreement are listed in alphabetical order and defined below. 
  
 (a) “Capital Expenditures” shall mean, for any period, the amount of capital expenditures, as determined in accordance with generally
accepted accounting principles. 
  
 (b) “Cause”
shall mean that Michael D. Lundin has (i) refused or willfully failed to carry out the specific lawful directions of the chief executive officer of Buyer, and such refusal or willful failure has not been cured within ten (10) days after written
notice from the chief executive officer of such refusal or willful failure; (ii) acted in a fraudulent or dishonest manner in his relations with Buyer; (iii) committed larceny, embezzlement, conversion or any act involving the misappropriation of
funds of Buyer; or (iv) been convicted of any crime involving an act of moral turpitude. 
  
 (c) “Change in Control” shall mean (i) the acquisition of, or, if earlier, the shareholder or director approval of the acquisition of, ownership or voting control, directly or indirectly, beneficially
or of record, on or after the Closing Date, by any person or group (within the meaning of Rule 13d-3 of the Securities and Exchange Commission under the Securities Exchange Act of 1934, as then in effect), of shares representing more than
thirty-three 

  

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percent (33%) of the aggregate ordinary voting power represented by the issued and outstanding capital stock of Buyer or any successor or assign of Buyer;
(ii) the occupation of a majority of the seats (other than vacant seats) on the board of directors of Buyer or any successor or assign of Buyer by persons who were neither (1) nominated by the board of directors or Buyer nor (2) appointed by
directors so nominated; or (iii) the occurrence of a Termination Event. 
  
 (d) “Code” shall mean the Internal Revenue Code of 1986, as amended. 
  
 (e) “ Contract” shall mean any written or oral contract, agreement, lease, plan, instrument, or other document or commitment, arrangement, undertaking, practice, or authorization that is binding on
any Person or its property under applicable law. 
  
 (f)
“Confidentiality Agreement” shall mean the Confidentiality Agreement among Sellers and Buyer dated September 27, 1999, as modified and amended by the Letter of Intent among Sellers and Buyer dated December 18, 1999. 
  
 (g) “EBITDA” shall mean, for any period, in accordance with
generally accepted accounting principles, the net income (loss) for the MLO Quarries or the Operations, as applicable, considered as separate corporate entities, for such period as determined in accordance with GAAP, excluding without duplication
(i) interest income and expense, (ii) provisions for taxes based on income, (iii) depreciation expense, (iv) amortization expense, other than pre-production costs which are being amortized, (v) extraordinary gain or losses, (vi) gains or losses on
the sale or disposal of assets not in the ordinary course of business, (vii) unusual or non-recurring (such as restructuring charges) income and expenses, (ix) any losses (credits) for which Buyer has been indemnified by and recovered from Sellers,
(x) any charges from the MLO Quarries’ or Operations’ parent or any indirect parent or its Affiliate with respect to general allocation of corporate overhead costs, executive compensation, management fees or welfare and pension benefits
(other than any such reasonable allocated costs or expenses for which actual benefits or services were provided and directly attributable to the MLO Quarries or Operations), and (xi) fees and expenses incurred in connection with the transactions
contemplated by this Agreement. 
  
 (h)
“Encumbrance” shall mean any lien, mortgage, security interest, restriction on transferability or voting, defect of title or other claim, charge, pledge, or encumbrance of any nature whatsoever on any property or property interest.

  
 (i) “Environmental Law” shall mean any
applicable federal, state, or local law (including common law), judicial decision, permit, statute, ordinance, rule, regulation, code, order, judgment, decree, or injunction in each case as in effect on or before the Closing Date relating to (i) the
protection of the environment (including, without limitation, air, surface water, groundwater, drinking water, and surface or subsurface land), (ii) the exposure to, release of, or the use, storage, recycling, treatment, generation, transportation,
processing, handling, labeling, protection, release, or disposal of, pollutants, contaminants, wastes, or chemicals or any toxic, radioactive, ignitable, corrosive, reactive, or otherwise hazardous substance, waste, or material, or (iii) the effect
of the environment on human health or safety, including, but not limited to, the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended 

  

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by the Superfund Amendments and Reauthorization Act of 1986, 42 USC 9601 et seq. (“CERCLA”), Solid Waste Disposal Act, as amended by
the Resource Conservation and Recovery Act of 1976 and Hazardous and Solid Waste Amendments of 1984, 42 USC 6901 et seq., Federal Water Pollution Control Act, as amended by the Clean Water Act of 1977, 33 USC 1251 et seq., Clean Air
Act of 1966, as amended, 42 USC 7401 et seq., Toxic Substances Control Act of 1976, 15 USC 2601 et seq., Hazardous Materials Transportation Act, 49 USC App. 1801 et seq., Federal Mine Safety and Health Act of 1977, Oil Pollution
Act of 1990, 33 USC 2701 et seq., Emergency Planning and Community Right-to-Know Act of 1986, 42 USC 11001 et seq., National Environmental Policy Act of 1969, 42 USC et seq., Safe Drinking Water Act of 1974, as amended, 42 USC
300(f) et seq., and any similar or implementing federal, state, or local law, amendment, rule, regulation, order, or directive issued thereunder. 
  
 (j) “Event of Default” shall mean the occurrence of any of the following: 
  

	 	(1)	Subject to the dispute resolution procedures in Section 2.4(c) of this Agreement, failure to pay a Contingent Payment when due, whether by acceleration or otherwise, provided that
Buyer has not cured such default within ten (10) days of Sellers’ delivery of written notice of such default; 

  

	 	(2)	Failure of Buyer to observe, perform or comply with any of its obligations under Section 2.4 of this Agreement, provided that Buyer has not cured such default within ten (10) days
of Sellers’ delivery of written notice of such default; 

  

	 	(3)	The discovery by Sellers of any inaccuracy in any representation or warranty of Buyer set forth in this Agreement which inaccuracy has a Material Adverse Effect;

  

	 	(4)	The filing of a petition against Buyer or any affiliate of Buyer seeking relief under the Federal Bankruptcy Code or any similar law or regulation, whether federal, state, or local,
not dismissed within thirty (30) days of filing; 

  

	 	(5)	The filing of a petition by Buyer or an affiliate of Buyer seeking relief under the Federal Bankruptcy Code or any similar law or regulation, whether federal, state, or local;

  

	 	(6)	The commencement of a proceeding by or against Buyer or any affiliate of Buyer under any statute or other law providing for an assignment for the benefit of creditors, the
appointment of a receiver, or any other similar law or regulation, whether federal, state, or local; or 

  

	 	(7)	The garnishment, attachment, levy, or other similar action taken by or on behalf of any creditor of Buyer, any affiliate of Buyer, or any of their respective properties which could
have Material Adverse Effect. 

  

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 (k) “Federal Bankruptcy Code” shall mean the Federal Bankruptcy Code, 11 U.S.C.
'101, et seq., as amended. 
  
 (l) “Force Majeure” shall mean any event or circumstance resulting from acts of God, strikes, fire or other causes beyond Buyer’s
reasonable control. 
  
 (m) “Fundamental Change”
shall mean any material change in the manner in which Sellers operated the MLO Quarries or Buyer operated the Port Inland Quarry prior to the Closing Date excluding synergistic or other changes necessitated solely by the transaction contemplated by
this Agreement or by applicable Laws. 
  
 (n) “Hazardous
Substances” shall mean any hazardous substances within the meaning of 101(14) of CERCLA or any pollutant, contaminant, waste, chemical or other toxic, radioactive, ignitable, corrosive, reactive, or otherwise hazardous substance, waste, or
material that, in each case, is regulated under any Environmental Law, including, without limitation, petroleum, its derivatives, by-products or other hydrocarbons, asbestos-containing materials, polychlorinated biphenyls, and urea formaldehyde.

  
 (o) “Intellectual Property” shall mean any
copyrights, patents, trademarks, technology rights and licenses, trade secrets, franchises, know-how, inventions, and other intellectual property. 
  
 (p) “Knowledge” shall mean, with respect to Sellers, the actual knowledge of the individuals specified on Schedule 1.1(p)(1), and,
with respect to Buyer, the actual knowledge of the individuals specified on Schedule 1.1(p)(2). 
  
 (q) “Laws” shall mean any statute, law, ordinance, regulation, order, or rule of any federal, state, local, or other governmental agency
or body or of any other type of regulatory body. 
  
 (r)
“Material Adverse Effect” shall mean any change, event, or effect that is, or will be, materially adverse to the business, operations, assets, liabilities, financial condition, or results of operations of Buyer or the Port Inland
Quarry, on the one hand, or MLO, MLO-Ohio, and MEL, taken as a whole, on the other hand. 
  
 (s) “MLO Quarries” shall mean the Rogers City, Michigan quarry and the Cedarville, Michigan quarry owned by MLO. Each such quarry shall sometimes be referred to herein as a “MLO Quarry.”

  
 (t) “Operations” shall mean the Port Inland
Quarry and the MLO Quarries. 
  
 (u) “Parties”
shall mean MLO, Sellers, and Buyer. 
  

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 (v) “Person” shall mean any natural person, corporation, partnership, limited liability
company, proprietorship, association, trust, business organization, government, governmental agency, or any legal entity. 
  
 (w) “Port Inland Quarry” shall mean the Port Inland quarry owned by Buyer. 
  
 (x) “Sellers’ Representative” shall mean the “Sellers’ Representative” as defined in
the Sellers’ Representative Agreement, who initially is Michael D. Lundin. 
  
 (y) “Sellers’ Representative Agreement” shall mean the “Sellers’ Representative Agreement” by and among the Sellers, the shareholders of the Sellers, and Michael D. Lundin attached
hereto as Exhibit 1.1(y). 
  
 (z) “Tax” or
“Taxes” shall mean any tax imposed under Subtitle A of the Code and any net income, alternative or add-on minimum tax, gross income, gross receipts, sales, use, ad valorem, value added, transfer, recordation, realty transfer,
franchise, profits, license, withholding on amounts paid to or by any of MLO, MLO-Ohio and MEL, payroll, social security, employment, unemployment, excise, severance, stamp, capital stock, occupation, property, environmental or windfall profits tax,
Michigan single business tax, premium, custom, duty, or other tax, governmental fee or other like assessment or charge of any kind whatsoever, together with any interest, penalty, addition to tax, or additional amount. 
  
 (aa) “Taxing Authority” shall mean any governmental
authority responsible for the administration of any Tax. 
  
 (bb)
“Tax Return” shall mean reports, information statements, forms, amended returns, claims for refund, and other documentation (including any additional or supporting material and estimated tax or information returns and reports) filed
or maintained, or required to be filed or maintained, in connection with the calculation, determination, assessment, or collection of any Tax and shall include any amended returns required as a result of examination adjustments made by a Taxing
Authority. 
  
 (cc) “Termination Event” shall
mean (i) the termination of Michael D. Lundin’s employment with Buyer other than for Cause, or (ii) Michael D. Lundin ceasing to have direct or indirect responsibility for managing and directing the Operations; provided that the termination of
Michael D. Lundin’s employment as a result of death, disability, or a resignation by Michael D. Lundin shall not constitute a Termination Event; provided further that if Michael D. Lundin resigns as a result of Buyer deliberately making working
conditions so intolerable that a reasonable employee would feel compelled to resign, then such resignation shall constitute a Termination Event. 
  
 ARTICLE II 
 PURCHASE AND SALE OF
INTERESTS 
  
 2.1 Purchase and Sale. Subject to the
terms and conditions contained in this Agreement, at the Closing, each Seller shall sell, assign, transfer, and deliver to Buyer (or at 

  

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Buyer’s discretion, Buyer and one or more of Buyer’s affiliates), and Buyer (or Buyer and one or more of Buyer’s affiliates, as the case may
be) shall accept and purchase from each Seller, all of such Seller’s right, title, and interest in and to (a) the Partnership Interests, (b) the MLO-Ohio Membership Interests, and (c) the MEL Membership Interests (collectively, the
“Interests”), free and clear of any Encumbrances. 
  
 2.2 Total Consideration. In consideration for the Interests, Buyer (or Buyer and one or more of Buyer’s affiliates, as the case may be) shall pay to Sellers the following aggregate purchase price (the “Purchase
Price”): 
  
 (a) Fifty-Three Million Dollars
($53,000,000) payable in cash at Closing (the “Cash Purchase Price”) by wire transfer of immediately available funds to Sellers in accordance with Schedule 2.2(a), and 
  
 (b) The contingent payments calculated in accordance with Section 2.3 of this
Agreement (collectively, the “Contingent Payments”). 
  
 2.3 Contingent Payments 
  
 (a) Tonnage
Payment. For each of the twelve years immediately following the Closing Date, if the aggregate tonnage of shipments from the Operations for such year exceeds 12,500,000 net tons (“Tonnage Target”), Buyer shall pay to Sellers an
amount equal to Two Million One Hundred Thousand Dollars ($2,100,000) (“Tonnage Payment”); provided that Tonnage Payments shall be made for no more than ten of the twelve years immediately following the Closing Date so that the
maximum aggregate amount of the Tonnage Payments shall not exceed Twenty-One Million Dollars ($21,000,000). In the event of a Force Majeure, the time period used to determine whether one or more Tonnage Targets have been met and the years in which
Sellers are eligible to receive a Tonnage Payment shall be extended in a manner reasonably agreed to by the Parties including consideration of the seasonality of the business of the Operations. Exhibit 2.3(a) sets forth an example of this
Section 2.3(a). 
  
 (b) EBITDA Payment. For each of the ten
years immediately following the Closing Date, if during such year (i) Buyer is required by Section 2.3(a) to make a Tonnage Payment, and (ii) the annual EBITDA target amounts described in Schedule 2.3(b) are exceeded in the
aggregate by the MLO Quarries, the Operations, or both, Buyer shall pay to Sellers the amounts reflected on Schedule 2.3(b) set forth opposite the relevant EBITDA target amounts. The aggregate annual amount payable by Buyer pursuant to this
Section 2.3(b) shall not exceed One Million Nine Hundred Thousand Dollars ($1,900,000). Exhibit 2.3(b) sets forth examples of this Section 2.3(b). 
  
 (c) EBITDA Target Amounts and Capital Expenditure Amounts. The EBITDA target amounts and Capital Expenditure amounts for each of the ten years
immediately following the Closing shall be as shown on Schedule 2.3(b). If, pursuant to a written agreement among Buyer and Sellers, the Capital Expenditures exceed the amount shown for such year on Schedule 2.3(b), the EBITDA target
amounts shall be adjusted upward by the amount of any EBITDA benefits specified in the written agreement increasing the amount of Capital Expenditures. Exhibit 2.3(c) sets forth an example of this Section 2.3(c). 
  

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 (d) Maximum Amounts. The maximum aggregate amount of the Contingent Payments to be made by Buyer
to Sellers shall be Forty Million Dollars ($40,000,000), and the maximum annual Contingent Payments to be made by Buyer to Sellers shall be Four Million Dollars ($4,000,000). Sellers acknowledge that no portion of the Contingent Payments shall be
guaranteed and that the Contingent Payments shall be made only to the extent provided for in this Section 2.3. 
  
 (e) Contingent Payment. Except as provided in Section 2.3(a) with respect to Force Majeure and subject to the provisions of that certain side
letter agreement between the parties executed and delivered on the Closing Date (the “Side Letter”), the measurement periods for the Contingent Payments shall be based upon the fiscal year of Buyer (January 1 through December 31),
beginning with January 1, 2000 of Buyer’s fiscal year 2000. The Buyer shall make annual Contingent Payments as required by Section 2.3(a) and (b) to Sellers within sixty (60) days of the end of the fiscal year of Buyer by wire transfer of
immediately available funds. 
  
 (f) Buyout. Promptly after
the third anniversary of the Closing Date, the Parties agree to meet to discuss in good faith, without any binding obligation to reach an agreement, the terms of a buyout by Buyer of Sellers’ rights to any future Contingent Payments.

  
 (g) Change in Control; Sale of Assets 
  
 (i) If during the twelve-year period immediately following
the Closing Date (the “Tonnage Payment Period”), there is a Change in Control, then Buyer shall (1) within three (3) business days of such Change in Control provide Sellers with written notice of such Change in Control and (2) at
the written election of Sellers, pay to Sellers the Accelerated Payment within thirty (30) days of Buyer’s receipt of written notice of Sellers’ election to accept the Accelerated Payment. The term “Accelerated Payment”
shall mean an amount equal to the sum of the present values of annual payments of Two Million One Hundred Thousand Dollars ($2,100,000) for each year remaining during the Tonnage Payment Period (but in no event shall the number of years for which
Tonnage Payments are made or attributable exceed ten) as if such payments were made in consecutive years starting with the next date on which a Tonnage Payment would otherwise come due and calculated using a discount rate equal to the applicable
interest rate at the most recent auction of federal ten year treasury notes prior to the date the Accelerated Payment is due and payable. 
  
 (ii) If, during the Tonnage Payment Period, (1) Buyer sells all or substantially all of the assets or equity interests relating to the
Operations, or (2) Buyer makes a Fundamental Change, in Sellers’ reasonable judgment, in the business of the Operations other than a Fundamental Change implemented with the written concurrence of Michael D. Lundin or Sellers’
Representative (provided that Sellers’ Representative is knowledgeable regarding the quarrying, processing, and selling of limestone and is not, directly or indirectly, affiliated with a competitor of Buyer or the Operations, and provided
further that Peter Johnson, Jim Rhude, Kent Rhude, and Robert Ross, Sr. shall 

  

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each be deemed by Buyer to have the requisite degree of knowledge to serve as a Sellers’ Representative) or a change resulting from a Force Majeure,
Buyer shall (A) within three (3) business days of the occurrence of such change provide written notice of such change to Sellers, and (B) at the written election of Sellers, shall pay to Sellers an amount equal to the Accelerated Payment multiplied
by (X) in the case of an asset or equity interest sale, the percentage set forth on Schedule 2.3(g) and, (Y) in the case of a fundamental change in the Operations as described above, 100%, within thirty (30) days of Buyer’s receipt of
written notice of Sellers’ election to accept such amount. If an asset or equity interest sale as described in subsection 2.3(g)(ii)(X) occurs for which less than 100% of the Accelerated Payment is paid, then (1) the Tonnage Target shall be
reduced by the percentage set forth in Schedule 2.3(g) times the Tonnage Target previously in effect and (2) the annual EBITDA target amounts described in Schedule 2.3(b) shall be reduced to amounts equal to 100% minus the percentage
set forth on Schedule 2.3(g) times the applicable annual EBITDA target amounts set forth on Schedule 2.3(b). 
  
 (iii) If an Event of Default occurs during the Tonnage Payment Period, then Buyer shall (1) within three (3) business days of the
occurrence of such Event of Default provide Sellers with written notice of such Event of Default, and (2) at the written election of Sellers, pay to Sellers within thirty (30) days the Accelerated Payment. 
  
 (iv) Acceptance by Sellers of the full amount of the
Accelerated Payment shall terminate immediately all of Buyer’s obligations to pay Tonnage Payments in accordance with Section 2.3(b). Acceptance by Sellers of any payment offered by Buyer in an amount less than the amount then due shall be
deemed an acceptance on account only, and Sellers’ acceptance of any such partial payment shall not constitute a waiver of Sellers’ right to receive the entire amount due. Upon the occurrence of an event with respect to which Sellers may
demand an Accelerated Payment pursuant to subsection 2.3(g)(i), (ii), or (iii) (an “Acceleration Event”), neither the failure of Sellers to promptly exercise their right to declare the Accelerated Payment to be immediately due and
payable, nor the failure of Sellers to demand strict performance of any other obligation of Buyer (or any successor) set forth in Section 2.3 or 2.4, shall constitute a waiver of any such rights, nor a waiver of such rights in connection with any
future Acceleration Event. The election by Sellers not to demand the Accelerated Payment upon the occurrence of an Acceleration Event shall not waive the right of Sellers to demand the Accelerated Payment upon the occurrence of any subsequent
Acceleration Event. The election by Sellers to demand the Accelerated Payment with respect to an asset or equity interest sale as described in subsection 2.3(g)(ii)(X) for which less than 100% of the Accelerated Payment is paid shall not preclude
Sellers from demanding any remaining amount of such Accelerated Payment upon the occurrence of a subsequent Acceleration Event. 
  
 (v) Notwithstanding any provision herein to the contrary, upon the occurrence of an Acceleration Event, Sellers must elect in writing to
have Buyer pay the Accelerated Payment within thirty (30) days of delivery of written notice of the occurrence of the Acceleration Event from Buyer. If Sellers fail to make such election within such thirty (30) day period, then Sellers shall have
waived their right to the Accelerated Payment for such Acceleration Event. 
  

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 2.4 Procedures relating to Contingent Payments  
  
 (a) Tonnage Statement. Within thirty (30) days following the
completion of each of the twelve years referred to in Section 2.3(a) (or until the maximum amount payable under such section has been paid, if prior to the end of such twelve-year period), Buyer shall prepare and deliver to Seller a statement
showing the tonnage of shipments from the Operations for such year (the “Preliminary Tonnage Statement”). Following receipt of the Preliminary Tonnage Statement, Sellers shall be afforded a period of thirty (30) days to review the
Preliminary Tonnage Statement (the “Tonnage Review Period”). To assist in any such review, Buyer shall make available to Sellers within five (5) business days of Sellers so requesting, and to any independent accounting firm selected
by Sellers (subject to such firm’s prior execution of Buyer’s standard confidentiality agreement attached hereto as Exhibit 2.4(a)(1) and Buyer’s independent accounting firm’s standard release attached hereto as Exhibit
2.4(a)(2)), whose fees and expenses shall be borne by Sellers, full access to the books and records of the Operations, Buyer’s accountants work papers, and such other records as reasonably requested by Sellers. The Tonnage Review Period
shall be extended by one day for each day that access to the books and records of the Operations is denied or delayed by Buyer. At or before the end of the Tonnage Review Period, Sellers shall either (i) accept the Preliminary Tonnage Statement in
its entirety or (ii) deliver to Buyer a written notice setting forth a detailed explanation of those items in the Preliminary Tonnage Statement that Sellers dispute (a “Notice of Tonnage Dispute”). If Sellers do not deliver a Notice
of Tonnage Dispute to Buyer within the Tonnage Review Period, Sellers shall be deemed to have accepted the Preliminary Tonnage Statement in its entirety. 
  
 (b) EBITDA Statement. Within thirty (30) days following the completion of each of the ten years referred to in Section 2.3(b), Buyer shall prepare
and deliver to Sellers a statement showing the annual EBITDA of each MLO Quarry and the Operations (the “Preliminary EBITDA Statement”). Following receipt of the Preliminary EBITDA Statement, Sellers shall be afforded a period of
sixty (60) days to review the Preliminary EBITDA Statement (the “EBITDA Review Period”). To assist in any such review, Buyer shall make available to Sellers within five (5) days of Sellers so requesting, and to any independent
accounting firm selected by Sellers (subject to such firm’s prior execution of Buyer’s standard confidentiality agreement attached hereto as Exhibit 2.4(a)(1) and Buyer’s independent accounting firm’s standard release
attached hereto as Exhibit 2.4(a)(2)), whose fees and expenses shall be borne by Sellers, full access to the books and records of the Operations, Buyer’s accountants work papers, and such other records as reasonably requested by Sellers.
The EBIDTA Review Period shall be extended by one day for each day that access to the books and records of the Operations is denied or delayed by Buyer. At or before the end of the EBITDA Review Period, Sellers shall either (i) accept the
Preliminary EBITDA Statement in its entirety or (ii) deliver to Buyer a written notice setting forth a detailed explanation of those items in the Preliminary EBITDA Statement that Sellers dispute (a “ Notice of EBITDA Dispute”). If
Sellers do not deliver a Notice of EBITDA Dispute to Buyer within the EBITDA Review Period, Sellers shall be deemed to have accepted the Preliminary EBITDA Statement in its entirety. 
  

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 (c) Resolution of Disputes. Within a period of thirty days after delivery of a Notice of Tonnage
Dispute or a Notice of EBITDA Dispute, Buyer and Sellers shall attempt to resolve in good faith any disputed items. If they are unable to do so, any disputed items will be submitted to a mutually agreeable nationally recognized firm of independent
accountants for resolution (the “ Independent Public Accountants”). Sellers and Buyer will share equally the cost of the Independent Public Accountants. The determination of the disputed items by the Independent Public Accountants
will be final and binding on the parties and a judgment on the determination of the Independent Public Accountant may be entered by a court of competent jurisdiction. Any other disputes, including those involving a Fundamental Change, shall be
resolved in accordance with Section 11.7 hereof. 
  
 2.5
Closing. Unless this Agreement shall have been terminated and the transactions herein contemplated shall have been abandoned pursuant to Article IX, and subject to the satisfaction or waiver of the conditions set forth in Articles VII and
VIII, the consummation of the transactions described in Sections 2.1 and 2.2 of this Agreement (the “Closing”) shall take place at 10:00 a.m., Eastern Daylight Savings Time, on April 17, 2000 at the offices of Thompson Hine &
Flory LLP, 3900 Key Center, 127 Public Square, Cleveland, Ohio, or at such other time and place as is agreed to by Buyer and Sellers. The date of such Closing is referred to herein as the “Closing Date.” 
  
 2.6 Default By Any of Sellers. Buyer shall not be obligated to
purchase from Sellers any Interests unless, on the Closing Date, Sellers are able to sell to Buyer one hundred percent (100%) of the Interests. 
  
 2.7 Allocation of Purchase Price. 
  
 (a) Buyer and Sellers shall mutually agree to allocate the Purchase Price as set forth on Schedule 2.7(a) to this Agreement (the
“Allocation”). The parties acknowledge that the Allocation has been determined pursuant to arm’s length bargaining between the parties regarding the fair market values of the Company’s assets in accordance with
Section 1060 of the Internal Revenue Code of 1986, as amended (the “Code”). The parties shall report (including with respect to the filing of Form 8594 to the Internal Revenue Service) the sale and purchase for all income tax
purposes in a manner consistent with such allocation and will not, in connection with the filing of such return, make any allocation of the Purchase Price which is contrary to the Allocation. The parties agree to consult with one another with
respect to any tax audit, controversy or litigation relating to the Allocation. 
  
 (b) All payments made to Sellers under Section 2.3 of this Agreement shall be allocated to goodwill. 
  

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 ARTICLE III 
 REPRESENTATIONS AND WARRANTIES OF SELLERS 
  
 Each Seller, severally and not jointly, hereby represents and warrants to Buyer as follows: 
  
 3.1 Authorization. Each of MLO and such Seller has full power and authority to enter into this Agreement and perform its obligations hereunder and
carry out the transactions contemplated hereby. The general and limited partners of MLO, and the directors and shareholders of such Seller, have taken all action required by Law, MLO’s Certificate of Limited Partnership and Limited Partnership
Agreement, such Seller’s Certificate of Incorporation and Bylaws (as applicable), and otherwise to authorize the execution and delivery by MLO and such Seller of this Agreement and the consummation by MLO and such Seller of the transactions
contemplated hereby. This Agreement constitutes the valid and binding agreement of MLO and such Seller and is enforceable against MLO and such Seller in accordance with its terms. 
  
 3.2 Organization, Good Standing and Qualification. MLO is a limited partnership duly organized and validly existing
under the laws of the State of Delaware. MLO-Ohio is a limited liability company duly organized and validly existing under the laws of the State of Ohio. MEL is a limited liability company duly organized and validly existing under the laws of the
State of Michigan. The Company has all requisite power and authority, and possesses all governmental and other permits, licenses, and other authorizations, to own, lease, or operate its assets and properties as now owned, leased, and operated and to
carry on its business as presently conducted. Except as set forth on Schedule 3.2, MLO is duly licensed or qualified to do business as a foreign limited partnership in each state wherein the failure to be licensed or qualified to do business
as a foreign limited partnership would have a Material Adverse Effect. MLO-Ohio is duly licensed or qualified to do business as a foreign limited liability company in each state wherein the failure to be licensed or qualified to do business as a
foreign limited liability company would have a Material Adverse Effect. MEL is duly licensed or qualified to do business as a foreign limited liability company in each state wherein the failure to be licensed or qualified to do business as a foreign
limited liability company would have a Material Adverse Effect. 
  
 3.3 No Violation. Other than as disclosed on Schedule 3.21, the execution and delivery of this Agreement by MLO and such Seller does not, and the consummation of the transactions contemplated hereby will not, (a) violate any
provision of, or result in the creation of any Encumbrance under, any agreement, indenture, instrument, lease, security agreement, mortgage, or lien to which MLO or such Seller is a party or by which MLO, the Interests, or such Seller is bound; (b)
violate any provision of the Certificate of Limited Partnership or Limited Partnership Agreement of MLO or the Articles of Organization or Operating Agreement of MLO-Ohio or MEL; (c) violate any order, arbitration award, judgment, writ, injunction,
decree, statute, rule, or regulation applicable to MLO or such Seller; or (d) violate any contractual or legal obligation or restriction to which MLO, the Interests, or such Seller is subject. 
  

 11 

 3.4 Capitalization. Schedule 3.4 sets forth the name and address of, and Interests owned
by, such Seller. Such Seller (i) is the sole record and beneficial owner of the Interests set forth opposite its name in Schedule 3.4, free and clear of any Encumbrance, and (ii) has full legal right, power, and authority to transfer such
Interests to Buyer in accordance with this Agreement, and to perform its other obligations hereunder and as contemplated hereby, without the need for the consent of any other Person. The Partnership Interests represent all of the issued and
outstanding partnership interests of MLO. The MLO-Ohio Membership Interests constitute all of the issued and outstanding membership interests of MLO-Ohio. The MEL Membership Interests constitute all of the issued and outstanding membership interests
of MEL. The Interests set forth opposite its name in Schedule 3.4 are owned only by such Seller. All of the Interests were duly authorized and validly issued, and were not issued in violation of any preemptive rights or the terms of any
agreement or other understanding binding upon such Seller, MLO, MLO-Ohio or MEL, and were issued in compliance with all applicable federal, foreign, and state securities or “blue-sky” laws and regulations. No assessments by the Companies
are outstanding with respect to the Interests. Except as disclosed in Schedule 3.4, each of MLO, MLO-Ohio, and MEL has never repurchased or redeemed any Interests, and there are no amounts owed or which may be owed to any person by MLO,
MLO-Ohio, or MEL as a result of any repurchase or redemption of Interests. Except as disclosed in Schedule 3.4, there are no agreements, arrangements, or understandings to which such Seller, MLO, MLO-Ohio, or MEL is a party or by which any of
them is bound to redeem or purchase any Interests. Except as disclosed in Schedule 3.4, there are no outstanding options, warrants, or other rights (including preemptive rights) to purchase, or any securities convertible into or exchangeable
for, Interests, and there are no agreements, arrangements, or understandings to which such Seller, MLO, MLO-Ohio, or MEL is a party or by which any of them is bound pursuant to which MLO, MLO-Ohio, or MEL is or may be required to issue additional
Interests. 
  
 3.5 Notices. Except as set forth on
Schedule 3.5, such Seller has not received any written notification within the last five years of any violation of any applicable ordinance or regulation of building, zoning, or other Law, in respect of the Company’s plants, structures,
properties, or operations. 
  
 Sellers, jointly and severally,
hereby represent and warrant to Buyer as follows: 
  
 3.6
Subsidiaries. The Company has no subsidiaries, and the Company does not own, directly or indirectly, any interest or investment (whether equity or debt) in any Person, or any equity securities, or options, warrants, or other rights to acquire
equity securities, or securities convertible into or exchangeable for equity securities, of any Person. 
  
 3.7 Affiliates. Except as set forth on Schedule 3.7, (i) the Company has no Contract with any of its officers, any Seller, any of
Sellers’ directors, officers, or shareholders, or any Person in which any of the foregoing is a director, officer, shareholder, member, or investor, and (ii) no officer of the Company, Seller, director, officer, or shareholder of any Seller, or
any Person in which any of the foregoing is a director, officer, shareholder, member, or investor, is a creditor or debtor of the Company. 
  

 12 

 3.8 Financial Statements. The Company has delivered to Buyer: (a) an unaudited balance sheet of
the Company as at December 31, 1999, and the related unaudited statement of income for the year then ended (the “Annual Company Financial Statements”), and (b) an unaudited balance sheet of the Company as at January 31, 2000 (the
“Interim Statement of Assets and Liabilities”) and the related unaudited statement of income for the one month then ended (the “Interim Company Financial Statements”) (the Annual Company Financial Statements and the
Interim Company Financial Statements are collectively referred to herein as the “Company Financial Statements”). The Company Financial Statements fairly present in all material respects the assets, liabilities, financial condition,
and results of operations of the Company as at the respective dates thereof and for the periods therein referred to in accordance with generally accepted accounting principles (“GAAP”) consistently applied subject, in the case of
the Interim Company Financial Statements, to normal year-end adjustments and the lack of notes and other presentation items. 
  
 3.9 Real Property Matters. None of the real property owned or leased by the Company is currently the subject of any eminent domain, condemnation,
or similar proceeding and, to Sellers’ Knowledge, no such proceeding is threatened. There is no adverse claim against such real property and there are no pending or, to Sellers’ Knowledge, threatened proceedings which might interfere with
Buyer’s quiet enjoyment of such real property or the exploitation of the mineral rights, if any, therein. 
  
 3.10 Title to Properties; Encumbrances. All of the assets, properties, and rights used by the Company in the operation of its business as it is
currently conducted are owned or leased by the Company. The Company has good, valid, and marketable title to, or valid leasehold interests in, all of the real property and tangible personal property which the Company purports to own or lease, free
and clear of any Encumbrance, except (a) as set forth in Schedule 3.10, including equipment and other leases set forth on such Schedule, (b) mechanics’, carriers’, workmen’s, repairmen’s, and other like liens arising or
incurred in the ordinary course of business, (c) liens for taxes and other governmental charges which are not due and payable, and (d) as to real property, (i) easements, covenants, rights-of-way, and other similar restrictions as set forth on
Schedule 3.10, (ii) any conditions that may be shown by any survey previously delivered to Buyer or physical inspection made prior to Closing, (iii) zoning, building, and other similar restrictions, and (iv) Encumbrances placed by any
landlord or third party on leased property or property over which the Company has easement rights which do not materially affect the rights of the Company with respect thereto (all the foregoing, collectively, “Permitted Liens”).
All of the tangible personal property owned or leased by the Company is in good working condition, ordinary wear and tear excepted, and has been maintained in a manner consistent with reasonable business practice. 
  
 3.11 Real Property Owned or Leased. Schedule 3.11 sets forth a
list of all real property which the Company owns or leases, or has agreed (or has an option) to purchase, sell, or lease, or may be obligated to purchase, sell, or lease. True copies of all such leases for real property have been delivered to Buyer
prior to the date hereof. Except as set forth in Schedule 3.11, no consent to the consummation of the transactions contemplated by this Agreement is required from the lessor of any such real property. Except as set forth in Schedule
3.11, the Company holds valid leasehold interests in and to the leases listed in Schedule 3.11, free and clear of any Encumbrances. 
  

 13 

 3.12 Equipment and Other Personal Property Leases. Schedule 3.12 hereto sets forth a
correct and complete list of all personal property leases to which the Company is a party, other than items acquired by the Company in the ordinary course of business from the date hereof through the Closing Date. Except as disclosed in Schedule
3.12 hereto, all of the personal property leased by the Company is currently used by the Company in the ordinary course of its business. Seller has delivered to Buyer correct and complete copies of all personal property leases identified on
Schedule 3.12. 
  
 3.13 Intellectual Property. All
Intellectual Property used by the Company in connection with its business is owned by the Company free and clear of all Encumbrances or has been duly licensed for use by the Company. None of the Intellectual Property used by the Company in
connection with its business has been within the last two years or is the subject of any pending adverse claim, or to the Knowledge of Sellers, any threatened claim of infringement. To Sellers’ Knowledge, the conduct of the Company’s
business does not infringe any Intellectual Property of another Person, and none of the Company or any Seller has received within the last two years any written notice contesting the Company’s right to use any process, method, part, design, or
material now used by it in the operation of its business. The Company has not granted any license in respect of any Intellectual Property which provides any third party with any outstanding rights. 
  
 3.14 Contracts. Schedule 3.14 is a list of all Contracts to
which the Company is a party or by which it is bound which have annual obligations in excess of $200,000. Sellers have delivered to Buyer copies of each listed Contract. Except as set forth on Schedule 3.14, the Company has not breached any
provision of, nor is it in default under the terms of, any such Contract and, to the Knowledge of Sellers, no other party to any such Contract has breached any provision or is in default thereunder. 
  
 3.15 Employee Benefit Plans. 
  
 (a) Schedule 3.15 contains a true and complete list of each bonus,
deferred compensation, incentive compensation, stock purchase, stock option, employment, consulting, severance or termination pay, hospitalization or other medical, life or other insurance, supplemental unemployment benefits, vacation pay, cafeteria
plan, profit-sharing, pension or retirement plan, program, agreement or arrangement, and any other fringe benefit program, agreement or arrangement, including any “employee benefit plan” within the meaning of Section 3(3) of Employee
Retirement Income Security Act of 1974, as amended (“ERISA”), whether formal or informal, written or oral, and whether legally binding or not, sponsored, maintained or contributed to or required to be contributed to by the Company
or by any trade or business, whether or not incorporated, that, together with the Company, would be deemed a “single employer” within the meaning of ERISA Section 4001(b)(1), a “controlled group” within the meaning of Code
Section 414(b), “trades or businesses under common control” within the meaning of Code Section 414(c), or an “affiliated service group” within the meaning of Code Section 414(m) (an “ERISA Affiliate”) within the last
three years, for the benefit of any 

  

 14 

 
employee, former employee, consultant, officer, or director of the Company or its ERISA Affiliates (collectively, the “Plans”). Neither the
Company nor any ERISA Affiliate has any plan or commitment, whether legally binding or not, to create any additional Plan or to modify or change any existing Plan that would affect any employee or terminated employee of the Company or any ERISA
Affiliate. 
  
 (b) The Company has furnished Buyer with copies of
all Plans (and, if applicable, related trust agreements) and all amendments thereto, summary plan descriptions, summary of material modifications, the three most recent Forms 5500 required to be filed with respect thereto, Internal Revenue Service
determination letters, and actuarial reports, in each case to the extent applicable. 
  
 (c) Except as required by any collective bargaining agreement or as set forth on Schedule 3.15, with respect to each of the Plans, neither the Company nor any ERISA Affiliate is obligated to continue with any
such Plan beyond the Closing Date. 
  
 (d) Except as set forth on
Schedule 3.15: (i) each of the Plans is, and has always been, operated in all material respects in accordance with all “Legal Requirements” (as defined below), and all persons who participate in the operation of such Plans and all
Plan “fiduciaries” (within the meaning of ERISA Section 3(21)) have always acted in accordance with the provisions of all “Legal Requirements,” the Plan documents and written descriptions of the Plans. “Legal
Requirements” means any law, statute, rule, ordinance, decree, regulation, requirement, order (including any executive order) or judgment of any court or government or regulatory body or political subdivision thereof, and (ii) each of the
Plans intended to be “qualified” within the meaning of Code Section 401(a) is so qualified and has received a currently applicable favorable determination letter, and nothing has occurred since the date of such letter that could reasonably
be expected to cause the loss of such qualification. 
  
 (e) No
liability under Title IV of ERISA has been incurred, directly or indirectly, by the Company or any ERISA Affiliate since the effective date of ERISA that has not been satisfied in full, and no condition exists that presents a material risk to the
Company or an ERISA Affiliate of incurring liability under such Title, other than (i) a liability for premiums due the Pension Benefit Guaranty Corporation (“PBGC”), which payments have been or will be made when due, and (ii)
liabilities associated with termination of any Plan. To the extent that this representation applies to ERISA Sections 4064, 4069 or 4204 of Title IV, it is made not only with respect to the Plans but also with respect to any employee benefit plan,
program, agreement or arrangement subject to Title IV of ERISA to which the Company or an ERISA Affiliate made, or was required to make, contributions during the three year period ending on the last day of the Company’s most recent fiscal year.

  
 (f) The PBGC has not instituted any “Proceedings”
(as defined below) to terminate any of the Plans, and no condition exists that presents a material risk that any such “Proceedings” will be instituted. “Proceedings” means any audit, litigation, allegation, claim, suit,
grievance, arbitration, investigation, civil, criminal, quasi-criminal, or administrative action, proceeding, charge, prosecution, or other action, in each case instituted or asserted in writing. 
  

 15 

 (g) No reportable event within the meaning of ERISA Section 4043, or prohibited transaction within the
meaning of ERISA Section 406 (for which no exception or exemption exists) has occurred with respect to any Plan. 
  
 (h) Neither the Company, any ERISA Affiliate, any of the Plans or any trust created thereunder nor any trustee or administrator thereof has engaged in any
transaction or has taken or failed to take any action in connection with which the Company, any ERISA Affiliate, any of the Plans, any such trust, any trustee or administrator thereof, or any party dealing with the Plans or any such trust could be
subject to any liability, fine, penalty, tax or related charge under ERISA Section 409, ERISA Section 502(c)(1), ERISA Section 502(1), or ERISA Section 4071 or Chapter 43 of the Code, or the imposition of a lien pursuant to Code Section 401(a)(29)
or Code Section 412 (n). 
  
 (i) Except as disclosed in
Schedule 3.15, no Plan is a “multiemployer plan” as such term is defined in ERISA Section 3(37), and no Plan is a plan maintained by more than one employer (a so-called “multiple employer plan”) for purposes of ERISA or
Code Section 413(c). With respect to each “multiemployer plan” so disclosed: (i) none of the representations and warranties of this Section 3.15 shall apply, and (ii) except as set forth in Schedule 3.15, all contributions required
to be made by the Company to such multiemployer plan have been made or are accrued and fully reflected in the Company Financial Statements. 
  
 (j) No amounts payable under the Plans or any other agreement or arrangement to which the Company or any ERISA Affiliate is a party will, as a result of
the transactions contemplated by this Agreement, fail to be deductible for federal income tax purposes by virtue of Code Section 280G. 
  
 (k) Except as disclosed in Schedule 3.15, no Plan provides benefits, including death or medical benefits (whether or not insured), with respect to
current or former employees after retirement or other termination of service other than (i) coverage mandated by applicable law, (ii) death benefits or retirement benefits under any “employee pension plan,” as that term is defined in ERISA
Section 3(2), or (iii) deferred compensation benefits accrued as liabilities on the books of the Company or the ERISA Affiliates. 
  
 (l) There is, and has been, no actual, or anticipated, threatened or expected, litigation or arbitration concerning or involving any of the Plans. No
complaints to or by any governmental authority have been filed, or are threatened or expected, with respect to any of the Plans. No claims have been made, or are expected, with respect to any bond or any fiduciary or other similar insurance with
regard to the actions of any person in connection with any of the Plans, nor has there been, nor is there expected, any notice to any insurer under any such bond or policy with regard to any of such Plans. No application for any bond or fiduciary
liability or similar insurance policy has been issued subject to any qualification, condition or exclusion. 
  
 (m) Except as provided in this Agreement, the consummation of the transactions contemplated by this Agreement will not (i) entitle any current or former
employee or officer of the Company or any ERISA Affiliate to severance pay, unemployment compensation or any other similar payment, (ii) accelerate the time of payment or vesting, or increase the amount of, 

  

 16 

 
any compensation due to any such employee or officer, (iii) result in any employment-related expenses or liabilities, the full cost of which will not be paid
by the Sellers, or (iv) result in any prohibited transaction described in ERISA Section 406 or Code Section 4975 for which an exemption is not available. 
  
 3.16 Certain Environmental Matters. Except as set forth on Schedule 3.16: (a) the Company is not in violation in any material respect of any
Environmental Law; (b) the Company has not stored or used any Hazardous Substances on or at any of its properties or assets, except in the ordinary course of its business in accordance in all material respects with applicable Environmental Laws; (c)
neither the Company nor any of its affiliates has received any written notice within the last ten years from any governmental authority, or within the last five years from any private claimant, advising it that the Company is in violation of any
Environmental Law or that it is responsible (or potentially responsible) for the cleanup of any Hazardous Substances at, on, or beneath such properties or assets or at, on, or beneath any land adjacent thereto; (d) neither the Company nor the
operation thereof are the subject of pending or, to Sellers’ Knowledge, threatened Federal, state, local, or private litigation or proceedings (whether judicial or administrative) involving a demand for damages, equitable relief, or other
potential liability with respect to violations of Environmental Laws; (e) the Company has obtained all permits necessary under applicable Environmental Laws (“Environmental Permits”) for the operation of its business, all such
Environmental Permits are in full force and effect, and the Company is in compliance in all material respects with such Environmental Permits; (f) none of the real property owned or leased by the Company is subject to any outstanding order from or
contract with any governmental authority respecting (i) any violation of Environmental Law, (ii) any investigation or remedial action under Environmental Laws, or (iii) any release of a Hazardous Substance; (g) during the past ten (10) years, no
material release, disposal, dumping, spill, or emission of any Hazardous Substance is occurring or has occurred (other than those that are currently being cleaned up in accordance with Environmental Laws) on, under, or to any of the real property
used in connection with the MLO Quarries; (h) during the past ten (10) years, none of the real property used in connection with the MLO Quarries has been operated by any Seller or the Company, as a Treatment, Storage, or Disposal facility for
Hazardous Waste (as such terms are defined under RCRA or any similar state statute); (i) to the Knowledge of Sellers, there is and has been no friable asbestos or urea formaldehyde in the properties which has not been encapsulated or otherwise
treated in material compliance with all Environmental Laws; (j) there are no active or inactive underground or above-ground storage tanks presently located at any of the properties; and (k) to the Knowledge of the Sellers, there are no liabilities,
whether accrued, contingent, absolute, determined, determinable or otherwise, arising under or relating to any Environmental Law, and there are no facts, conditions, situations or sets of circumstances, which would reasonably be expected to result
in such liability, with respect to the business, assets, or properties of the Company except for any such non-compliances or liabilities which would not have a Material Adverse Effect. 
  
 3.17 Absence of Certain Changes. Except as and to the extent set forth on Schedule 3.17 hereto, since January
31, 2000, the Company has not: 
  
 (a) suffered any material
adverse change in its financial condition, experienced any material labor difficulty, or suffered any material casualty loss (whether or not insured); 
  

 17 

 (b) made any material change in its business or operations or in the manner of conducting its business
other than changes in the ordinary course of business; 
  
 (c)
incurred any material obligations or liabilities, except items incurred in the ordinary course of business; 
  
 (d) canceled any other debts or claims owed to it, or waived any rights, relating to the business of the Company of substantial value; 
  
 (e) granted any increase in the compensation of any general or limited
partner, officer, employee, or agent of the Company other than increases in the ordinary course of business; 
  
 (f) made any capital expenditure or commitment in excess of $200,000 for replacements or additions to property, plant, equipment; 
  
 (g) made any change in any method of accounting or accounting practice; or

  
 (h) agreed, whether in writing or otherwise, to take any
action described in this Section 3.17. 
  
 3.18 Litigation.
Except as set forth in Schedule 3.18, there are no claims, actions, suits, or proceedings relating to the Company pending or, to the Knowledge of Sellers, threatened in writing by or against the Company at law or in equity or before or by any
federal, state, municipal, or other governmental department, commission, board, agency, instrumentality, or authority. 
  
 3.19 Labor Matters. Except as set forth in Schedule 3.19, (a) there are no collective bargaining agreements in effect between the Company
and labor unions or similar organizations representing any of the Company’s employees, and (b) during the past two years, there has been no request for collective bargaining or for an employee election from any employee, union, or the National
Labor Relations Board. Except as set forth in Schedule 3.19, (i) there is no unfair labor practice complaint against the Company pending or, to the Knowledge of Sellers, threatened in writing before the National Labor Relations Board or the
United States Department of Labor; (ii) there is no labor strike, dispute, slowdown, or stoppage in progress or, to the Knowledge of Sellers, threatened in writing against or involving the Company; (iii) no labor grievance or arbitration proceeding
is pending; (iv) no private agreement with employees restricts the Company from relocating, closing, or terminating any of its operations or facilities; and (v) the Company has not in the past two years experienced any labor strike, dispute,
slowdown, or stoppage. 
  
 3.20 Insurance. Schedule
3.20 hereto sets forth a list of all policies of fire, liability, worker’s compensation, health, title, and other forms of insurance presently in effect with respect to the Company. All such policies are valid, outstanding, and enforceable
policies; will remain in full force and effect at least through the Closing Date; and will not in any way be affected by, 

  

 18 

 
or terminate or lapse by reason of, the transactions contemplated by this Agreement (except on the Closing Date). Schedule 3.20 identifies all risks
of the type typically covered by insurance which the Company has designated as being self-insured, with the amounts of self insurance specifically indicated. 
  
 3.21 Consents and Approvals. Schedule 3.21 identifies all consents, approvals, authorizations, or orders of third parties, including
governmental authorities, necessary for the Company and Sellers to consummate the transaction contemplated by this Agreement. 
  
 3.22 Broker’s and Finder’s Fees. No agent, broker, investment banker, person, or firm acting on behalf of Sellers or under their
authority is or will be entitled to any broker’s or finder’s fee or any other commission or similar fee directly or indirectly in connection with any of the transactions contemplated herein. 
  
 3.23 Major Customers and Suppliers. Schedule 3.23 sets forth a
complete and correct list of the names and corresponding dollar volumes of the ten (10) largest customers and twenty (20) largest suppliers that were the largest dollar volume customers or suppliers of products or services sold or provided by or to
the Company for the twelve months ended December 31, 1998 and December 31, 1999. Except as set forth and described in Schedule 3.23, the Company has not received any notice or other communication (written or oral) from any of the customers or
suppliers listed in Schedule 3.23 terminating or reducing in any material respect, or setting forth an intention to terminate or reduce in the future, or otherwise reflecting a material adverse change in, the business relationship between
such customer or supplier and the Company. 
  
 3.24 Taxes.

  
 (a) Except as set forth in Schedule 3.24, MLO,
MLO-Ohio, and MEL have duly and timely filed all Tax Returns and other filings in respect of Taxes required to be filed by them on or prior to the date hereof, and have in a timely manner paid all Taxes which are due for all periods ending on or
before the date hereof, shown on such Tax Returns. All such Tax Returns have been accurately and completely prepared in all material respects regarding the income, business, assets, operations, and activities of MLO, MLO-Ohio, and MEL in compliance
with all applicable laws, rules and regulations. The charges, accruals, and reserves for Taxes with respect to MLO, MLO-Ohio, and MEL reflected on the books of MLO, MLO-Ohio, and MEL (excluding any provision for deferred Taxes) are adequate to cover
such Taxes, except for Taxes resulting from the transactions contemplated by this Agreement. 
  
 (b) Except as set forth in Schedule 3.24, there are no audits, suits, investigations, actions, or proceedings currently pending or, to the Knowledge of Sellers, threatened against any of MLO, MLO-Ohio, and MEL
by any Taxing Authority for the assessment or collection of Taxes, no claims for the assessment or collection of Taxes have been asserted against any of MLO, MLO-Ohio, and MEL, and there are no matters under discussion by any of MLO, MLO-Ohio, and
MEL with any Taxing Authority regarding claims for the assessment or collection of Taxes. Any Taxes that have been claimed or imposed as a result of any examinations of any Tax Return of MLO, MLO-Ohio, and MEL by any Taxing Authority are being
contested in good 

  

 19 

 
faith and have been disclosed in writing to Buyer. The Internal Revenue Service has not audited the federal income tax returns for MLO, MLO-Ohio, and MEL in
the ten years preceding the date of this Agreement. Except as set forth in Schedule 3.24, there are no agreements or applications by any of MLO, MLO-Ohio, and MEL for an extension of time for the assessment or payment of any Taxes nor any
waiver of the statute of limitations in respect of Taxes. There are no Tax liens on any of the assets of any of MLO, MLO-Ohio, and MEL, except for liens for Taxes not yet due or payable. Except as set forth in Schedule 3.24, there are no
requests for rulings or determinations in respect of any Tax pending between any of MLO, MLO-Ohio, and MEL and any Taxing Authority. Except as set forth in Schedule 3.24, to the Knowledge of Sellers, no written claim has been received by MLO,
MLO-Ohio, or MEL from any Taxing Authority in a jurisdiction in which MLO, MLO-Ohio, or MEL does not file Tax Returns that it is or may be subject to taxation by that jurisdiction. 
  
 (c) MLO has been taxable as a partnership for state, federal and local income tax purposes at all times since its formation.
MLO-Ohio and MEL have been taxed as partnerships for federal income tax purposes and as limited liability companies for state and local tax purposes at all times since their formation. 
  
 (d) MLO, MLO-Ohio, and MEL have not and have never been parties to or bound by any tax indemnity agreement, tax sharing
agreement, tax allocation agreement or similar agreement or arrangement. 
  
 (e) MLO, MLO-Ohio, and MEL have withheld and paid over to the appropriate Taxing Authorities all Taxes required to have been withheld and paid over in connection with amounts paid or owing to any employee, creditor,
independent contractor, or other third party. 
  
 (f) Except as
set forth in Schedule 3.24, none of Sellers are “foreign persons” within the meaning of Section 1445(f)(3) of the Code. 
  
 (g) Except as set forth in Schedule 3.24, there are no accounting method changes or proposed accounting method changes for any of MLO, MLO-Ohio,
and MEL, nor any other item, that could give rise to an adjustment under Section 481 of the Code for periods after the Closing Date, and MLO, MLO-Ohio, and MEL will not be required to make any Section 481 adjustments as a result of the transaction
contemplated by this Agreement. 
  
 (h) Except as set forth in
Schedule 3.24, no power of attorney has been granted by MLO, MLO-Ohio, and MEL to any Person which is currently in force with respect to any matter relating to Taxes. 
  
 (i) None of the property owned or used by MLO, MLO-Ohio, and MEL is subject to a tax benefit transfer lease executed in
accordance with Section 168(h) of the Internal Revenue Code of 1954, as in effect immediately before the adoption of the Code. 
  
 (j) None of the property owned by MLO, MLO-Ohio, and MEL is “tax-exempt use property” within the meaning of Section 168(h) of the Code.

  

 20 

 (k) None of the property owned by MLO, MLO-Ohio, and MEL is subject to a lease, which would be treated as
a financing arrangement for federal income tax purposes. 
  
 (l)
None of the assets of MLO, MLO-Ohio, and MEL directly or indirectly secures any debt the interest of which is excluded from gross income under Section 103 of the Code. 
  
 (m) Except as set forth in Schedule 3.24, there are no sales contracts outstanding for which any of MLO, MLO-Ohio,
and MEL received an advance payment or deposit. 
  
 (n)
Schedule 3.24 contains a list of all jurisdictions where MLO, MLO-Ohio, and MEL currently file Tax Returns. 
  
 (o) Except as set forth in Schedule 3.24, none of MLO, MLO-Ohio, and MEL have deposited amounts in a fund established under Section 607 of the
Merchants Marine Act, 1936, and subject to Section 7518 of the Code. 
  
 3.25 Compliance with Laws. The Company’s operation of its business complies in all material respects with all Laws. Neither the Company nor any Seller has received a notice of violation from any governmental authority.

  
 ARTICLE IV 
 REPRESENTATIONS AND WARRANTIES OF BUYER 
  
 Buyer hereby represents and warrants to Sellers as follows: 
  
 4.1 Authorization. Buyer has full power and authority to enter into this Agreement and to perform its obligation hereunder and to carry out the
transactions contemplated hereby. The directors of Buyer have taken all action required by Law, Buyer’s Certificate of Incorporation and Bylaws, and otherwise to authorize the execution and delivery of this Agreement and the consummation by
Buyer of the transactions contemplated hereby. This Agreement constitutes the valid and binding agreement of Buyer and is enforceable against Buyer in accordance with its terms. 
  
 4.2 Organization, Good Standing and Qualification. Buyer is a corporation duly organized, validly existing, and in
good standing under the laws of the State of Delaware. Buyer has all requisite power and authority, and possesses all governmental and other permits, licenses, and other authorizations, to operate the Port Inland Quarry as now operated, and to carry
on its business as presently conducted at the Port Inland Quarry. Buyer is duly licensed or qualified to do business as a foreign corporation in Michigan. 
  
 4.3 No Violation. The execution and delivery of this Agreement by Buyer does not, and the consummation of the transactions contemplated hereby will
not, (a) violate any provision of, or result in the creation of any Encumbrance under, any agreement, indenture, instrument, lease, security agreement, mortgage, or lien to which Buyer is a party or by which Buyer is bound; (b) violate any provision
of the Certificate of Incorporation or Bylaws of Buyer; (c) violate any order, arbitration award, judgment, writ, injunction, decree, statute, rule, or regulation applicable to Buyer; or (d) subject to obtaining the consents identified on
Schedule 4.15, violate any contractual or legal obligation or restriction to which Buyer is subject. 
  

 21 

 4.4 Financial Statements. Buyer has delivered to Sellers: (a) an unaudited balance sheet of the
Port Inland Quarry as at December 31, 1999, and the related unaudited statement of income for the year then ended (the “Annual Port Inland Financial Statements”), and (b) an unaudited balance sheet of the Port Inland Quarry as at
February 29, 2000, and the related unaudited statement of income for the month ended February 29, 2000 (the “Interim Port Inland Financial Statements”) (the Annual Port Inland Financial Statements and the Interim Port Inland
Financial Statements are collectively referred to herein as the “Port Inland Financial Statements”). The Port Inland Financial Statements fairly present in all material respects the assets, liabilities, financial condition, and
results of operations of the Port Inland Quarry as at the respective dates thereof and for the periods therein referred to in accordance with GAAP consistently applied subject, in the case of the Interim Port Inland Financial Statements, to normal
year-end adjustments and the lack of notes and other presentation items. 
  
 4.5 Real Property Matters. Except as set forth on Schedule 4.5, Buyer has not received any written notification within the last five years of any violation of any applicable ordinance or regulation of
building, zoning, or other Law, in respect of the Port Inland Quarry’s plants, structures, properties, or operations. None of the real property owned or leased by Buyer in connection with the Port Inland Quarry is currently the subject of any
eminent domain, condemnation, or similar proceeding and, to Buyer’s Knowledge, no such proceeding is threatened. Except as set forth on Schedule 4.5, there is no adverse claim against such real property and there are no pending or, to
Buyer’s Knowledge, threatened proceedings which might interfere with Buyer’s quiet enjoyment of such real property or the exploitation of the mineral rights, if any, therein. 
  
 4.6 Title to Properties; Encumbrances. All of the assets, properties, and rights used by the Port Inland Quarry as it
is currently conducted are owned or leased by Buyer. Buyer has good, valid, and marketable title to, or valid leasehold interests in, all of the real property and tangible personal property used in connection with the Port Inland Quarry, free and
clear of any Encumbrance, except (a) as set forth in Schedule 4.6, including equipment and other leases set forth on such Schedule, (b) mechanics’, carriers’, workmen’s, repairmen’s, and other like liens arising or
incurred in the ordinary course of business, (c) liens for taxes and other governmental charges which are not due and payable, and (d) as to real property, (i) easements, covenants, rights-of-way, and other similar restrictions as set forth on
Schedule 4.6, (ii) any conditions that may be shown by any survey previously delivered to Sellers or physical inspection made prior to Closing, (iii) zoning, building, and other similar restrictions, and (iv) Encumbrances placed by any
landlord or third party on leased property or property over which Buyer has easement rights which do not materially affect the rights of Buyer with respect thereto. All of the tangible personal property owned or leased by Buyer and used solely in
connection with the Port Inland Quarry is in good working condition, ordinary wear and tear excepted, and has been maintained in a manner consistent with reasonable business practice. 
  
 4.7 Real Property Owned or Leased. Schedule 4.7 sets forth a list of all real property which Buyer owns or
leases, or has agreed (or has an option) to purchase, sell, or lease, or may 

  

 22 

 
be obligated to purchase, sell, or lease, in connection with the Port Inland Quarry. True copies of all such leases for real property have been delivered to
Sellers prior to the date hereof. Except as set forth in Schedule 4.7, no consent to the consummation of the transactions contemplated by this Agreement is required from the lessor of any such real property. Except as set forth in Schedule
4.7, Buyer holds valid leasehold interests in and to the leases listed in Schedule 4.7, free and clear of any Encumbrances. 
  
 4.8 Equipment and Other Personal Property Leases. Schedule 4.8 hereto sets forth a correct and complete list of all personal property leases
of Buyer which relate solely to the Port Inland Quarry, other than items acquired by Buyer in the ordinary course of business from the date hereof through the Closing Date. Except as disclosed in Schedule 4.8 hereto, all of the personal
property leased by Buyer in connection with the Port Inland Quarry is currently used by the Port Inland Quarry in the ordinary course of its business. Buyer has delivered to Sellers correct and complete copies of all personal property leases
identified on Schedule 4.8. 
  
 4.9 Contracts.
Schedule 4.9 is a list of all Contracts of Buyer which relate solely to the operation of the Port Inland Quarry which have annual obligations in the aggregate in excess of $200,000. Buyer has delivered to Sellers copies of each listed
Contract other than blanket purchase orders. Except as set forth on Schedule 4.9, Buyer has not breached any provision of, nor is it in default under the terms of, any such Contract and, to the Knowledge of Buyer, no other party to any such
Contract has breached any provision or is in default thereunder. 
  
 4.10 Certain Environmental Matters. 
  
 (a)
Except as and to the extent set forth on Schedule 4.10(a) hereto, (i) the Port Inland Quarry is not in violation in any material respect of any Environmental Law; (ii) the Port Inland Quarry has not stored or used any Hazardous Substances on
or at any of its properties or assets, except in the ordinary course of its business in accordance in all material respects with applicable Environmental Laws; (iii) the Port Inland Quarry has not received any written notice within the last ten
years from any governmental authority, or within the last five years from any private claimant, advising it that the Port Inland Quarry is in violation of any Environmental Law or that it is responsible (or potentially responsible) for the cleanup
of any Hazardous Substances at, on, or beneath such properties or assets or at, on, or beneath any land adjacent thereto; (iv) neither the Port Inland Quarry nor the operation thereof are the subject of pending or, to Buyer’s Knowledge,
threatened Federal, state, local, or private litigation or proceedings (whether judicial or administrative) involving a demand for damages, equitable relief, or other potential liability with respect to violations of Environmental Laws; (v) the Port
Inland Quarry has obtained all Environmental Permits for the operation of its business, all such Environmental Permits are in full force and effect, and the Port Inland Quarry is in compliance in all material respects with such Environmental
Permits; (vi) none of the real property owned or leased by the Port Inland Quarry is subject to any outstanding order from or contract with any governmental authority respecting (A) any violation of Environmental Law, (B) any investigation or
remedial action under Environmental Laws, or (C) any release of a Hazardous Substance; (vii) during the past two (2) years, no material release, disposal, dumping, spill, or emission of any Hazardous Substance is occurring or has occurred (other
than those that are currently being cleaned up in accordance with Environmental Laws) on, or under, or to any of the real property used in 

  

 23 

 
connection with the Port Inland Quarry; (viii) during the past ten (10) years, none of the real property used in connection with the Port Inland Quarry has
been operated by Buyer as a Treatment, Storage, or Disposal facility for Hazardous Waste (as such terms are defined under RCRA or any similar state statute); (ix) to the Knowledge of Buyer, there is and has been no friable asbestos or urea
formaldehyde in the properties which has not been encapsulated or otherwise treated in material compliance with all Environmental Laws; (x) there are no active or inactive underground or above-ground storage tanks presently located at any of the
Port Inland Quarry properties; and (xi) to the Knowledge of Buyer, there are no liabilities, whether accrued, contingent, absolute, determined, determinable or otherwise, arising under or relating to any Environmental Law, and there are no facts,
conditions, situations or sets of circumstances, which would reasonably be expected to result in such liability, with respect to the business, assets, or properties of the Port Inland Quarry except for any such non-compliance or liabilities which
would not have a Material Adverse Effect. 
  
 (b) Except for any
non-compliance which would not have a Material Adverse Effect, Buyer and its Subsidiaries (each a “Buyer Company” and collectively, the “Buyer Companies”) are in compliance with any and all Environmental Laws
including, without limitation, (a) all Environmental Laws in all jurisdictions in which a Buyer Company owns or operates, or has owned or operated, a facility or site, arranges for disposal or treatment of any Hazardous Substance, solid waste or
other wastes, accepts or has accepted for transport any Hazardous Substance, solid waste or other wastes or holds or has held any interest in real property or otherwise, and (b) all Environmental Laws relating to permits, licenses, approvals,
authorizations, consents and registrations required for Buyer Companies’ operation. No litigation or proceeding arising under, relating to or in connection with any Environmental Law is pending or, to the Knowledge of Buyer, threatened against
a Buyer Company, any real property in which a Buyer Company holds or has held an interest or any past or present operation of a Buyer Company, other than litigation or proceedings which would not, individually or in the aggregate, have a Material
Adverse Effect. To the Knowledge of Buyer, no release, threatened release or disposal of any Hazardous Substance, solid waste or other wastes is occurring, or has occurred (other than those that are currently being cleaned up in accordance with
Environmental Laws), which is having or would have a Material Adverse Effect, on, under or to any real property in which a Buyer Company holds any interest or performs any of its operations, in violation of any Environmental Law. 
  
 (c) For the purposes of this Section 4.10, a “Subsidiary” of
Buyer or any of its Subsidiaries shall mean (a) a corporation more than fifty percent (50%) of the voting power or capital stock of which is owned, directly or indirectly, by Buyer or by one or more other subsidiaries of Buyer or by Buyer and one or
more subsidiaries of Buyer, (b) a partnership or limited liability company of which Buyer, one or more other subsidiaries of Buyer or Buyer and one or more subsidiaries of Buyer, directly or indirectly, is a general partner or managing member, as
the case may be, or otherwise has the power to direct the policies, management and affairs thereof, or (c) any other Person (other than a corporation) in which Buyer, one or more other subsidiaries of Buyer or Buyer and one or more subsidiaries of
Buyer, directly or indirectly, has at least a majority ownership interest or the power to direct the policies, management and affairs thereof. 
  

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 4.11. Absence of Certain Changes. Except as and to the extent set forth on Schedule 4.11
hereto, since December 31, 1999, the Port Inland Quarry has not suffered any material adverse change in its financial condition, experienced any material labor difficulty, or suffered any material casualty loss (whether or not insured), and Buyer
has not with respect to the Port Inland Quarry: 
  
 (a) made any
material change in the business or operations or in the manner of conducting the business other than changes in the ordinary course of business; 
  
 (b) incurred any material obligations or liabilities, except items incurred in the ordinary course of business; 
  
 (c) canceled any other debts or claims owed to it, or waived any rights,
relating to the business of substantial value; 
  
 (d) granted any
increase in the compensation of any officer, employee, or agent of the Port Inland Quarry other than increases in the ordinary course of business; 
  
 (e) made any capital expenditure or commitment in excess of $200,000 for replacements or additions to property, plant, equipment; 
  
 (f) made any change in any method of accounting or accounting practice; or

  
 (g) agreed, whether in writing or otherwise, to take any
action described in this Section 4.11. 
  
 4.12.
Litigation. There are no claims, actions, suits, or proceedings pending or, to the Knowledge of Buyer, threatened in writing by or against Buyer at law or in equity or before or by any federal, state, municipal, or other governmental
department, commission, board, agency, instrumentality, or authority which would have a Material Adverse Effect. 
  
 4.13. Labor Matters. Except as set forth in Schedule 4.13, (a) there are no collective bargaining agreements in effect between Buyer and
labor unions or similar organizations representing any of the Port Inland Quarry’s employees, and (b) during the past two years, at the Port Inland Quarry, there has been no request for collective bargaining or for an employee election from any
employee, union, or the National Labor Relations Board. Except as set forth in Schedule 4.13 and with respect solely to the Port Inland Quarry, (i) there is no unfair labor practice complaint against Buyer pending or, to the Knowledge of
Buyer, threatened in writing before the National Labor Relations Board or the United States Department of Labor; (ii) there is no labor strike, dispute, slowdown, or stoppage in progress or, to the Knowledge of Buyer, threatened in writing against
or involving Buyer; (iii) no labor grievance or arbitration proceeding is pending; (iv) no private agreement with employees restricts Buyer from relocating, closing, or terminating any of its operations or facilities; and (v) Buyer has not in the
past two years experienced any labor strike, dispute, slowdown, or stoppage. 
  
 4.14. Insurance. Schedule 4.14 hereto sets forth a list of all policies of fire, liability, 
  

 25 

 
worker’s compensation, health, title, and other forms of insurance presently in effect with respect to the Port Inland Quarry. All such policies are
valid, outstanding, and enforceable policies; will remain in full force and effect at least through the Closing Date; and will not in any way be affected by, or terminate or lapse by reason of, the transactions contemplated by this Agreement (except
on the Closing Date). Schedule 4.14 identifies all risks of the type typically covered by insurance with respect to the Port Inland Quarry and which Oglebay has designated as being self-insured, with the amounts of self insurance specifically
indicated. 
  
 4.15. Consents and Approvals. Schedule
4.15 identifies all consents, approvals, authorizations, or orders of third parties, including governmental authorities, necessary for Buyer to consummate the transaction contemplated by this Agreement. 
  
 4.16. Broker’s and Finder’s Fees. No agent, broker,
investment banker, person, or firm acting on behalf of Buyer or under its authority is or will be entitled to any broker’s or finder’s fee or any other commission or similar fee directly or indirectly in connection with any of the
transactions contemplated herein. 
  
 4.17 Major Customers and
Suppliers. Schedule 4.17 sets forth a complete and correct list of the names and corresponding dollar volumes of the ten (10) largest customers and twenty (20) largest suppliers that were the largest dollar volume customers or suppliers
of products or services sold or provided by or to the Port Inland Quarry for the twelve months ended December 31, 1998 and December 31, 1999. Except as set forth and described in Schedule 4.17, Buyer has not received any notice or other
communication (written or oral) from any of the customers or suppliers listed in Schedule 4.17 terminating or reducing in any material respect, or setting forth an intention to terminate or reduce in the future, or otherwise reflecting a
material adverse change in, the business relationship between such customer or supplier and Buyer. 
  
 4.18 Taxes. 
  
 (a) Buyer has duly and timely filed all Tax Returns and other filings in respect of Taxes required to be filed by Buyer on or prior to the date hereof,
and has in a timely manner paid all Taxes which are (or will be) due for all periods ending on or before the date hereof, shown due on such Tax Returns. All such Tax Returns have been accurately and completely prepared in all material respects
regarding the income, business, assets, operations, and activities of Buyer in compliance with all applicable laws, rules and regulations. The charges, accruals, and reserves for Taxes with respect to Buyer reflected on the books of Buyer (excluding
any provision for deferred Taxes) are adequate to cover such Taxes. 
  
 (b) There are no audits, suits, investigations, actions, or proceedings currently pending or, to the Knowledge of Buyer, threatened against Buyer by any Taxing Authority for the assessment or collection of Taxes, no claims for the
assessment or collection of Taxes have been asserted against Buyer, and there are no matters under discussion by Buyer with any Taxing Authority regarding claims for the assessment or collection of Taxes. Any Taxes that have been claimed or imposed
as a result of any examinations of any Tax Return of Buyer by any Taxing Authority are being contested in good faith and have been disclosed in writing to Sellers. The 

  

 26 

 
last year for which the Internal Revenue Service audited the federal income tax returns for Buyer was 1994. There are no agreements or applications by Buyer
for an extension of time for the assessment or payment of any Taxes nor any waiver of the statute of limitations in respect of Taxes. There are no Tax liens on any of the assets of Buyer, except for liens for Taxes not yet due or payable. There are
no requests for rulings or determinations in respect of any Tax pending between Buyer and any Taxing Authority. To the Knowledge of Buyer, no written claim has been received by Buyer from any Taxing Authority in a jurisdiction in which Buyer does
not file Tax Returns that it is or may be subject to taxation by that jurisdiction. 
  
 (c) At all times on or after January 1, 1994, Buyer has not and has never been a party to or bound by any tax indemnity agreement, tax sharing agreement, tax allocation agreement or similar agreement or arrangement.

  
 (d) Except for amounts not to exceed $750,000 in the
aggregate, Buyer has withheld and paid over to the appropriate Taxing Authorities all Taxes required to have been withheld and paid over in connection with amounts paid or owing to any employee, creditor, independent contractor, or other third
party. 
  
 (e) There are no accounting method changes or proposed
accounting method changes for Buyer, nor any other item, that could give rise to an adjustment under Section 481 of the Code for periods after the Closing Date, and Buyer will not be required to make any Section 481 adjustments as a result of the
transaction contemplated by this Agreement. 
  
 4.19 Compliance
with Laws. Buyer’s operation of the Port Inland Quarry complies in all material respects with all Laws. With respect to the Port Inland Quarry, Buyer has not received a written notice of violation from any governmental authority.

  
 4.20 Employee Benefit Plans. Buyer has made full
payment of all amounts required, under applicable law or under the governing documents, to have been paid as a contribution to or a benefit under each “employee benefit plan” (within the meaning of ERISA Section 3(3)) that Buyer sponsors,
maintains, contributes to, has liability with respect to, or has an obligation to contribute to such plan (the “Buyer Plans”). The liability of Buyer with respect to each Buyer Plan has been fully funded based upon reasonable and
proper actuarial assumptions, has been fully insured, or has been fully reserved for on its financial statements. No changes have occurred or are expected to occur that would cause a material increase in the cost of providing benefits under the
Buyer Plans. With respect to each Buyer Plan that is intended to be qualified under Code Section 401(a): (a) the Buyer Plan and any associated trust operationally comply with the applicable requirements of Code Section 401(a), (b) the Buyer Plan and
any associated trust have been amended to comply with all such requirements as currently in effect, other than those requirements for which a retroactive amendment can be made within the “remedial amendment period” available under Code
Section 401(b) (as extended under Treasury Regulations and other Treasury pronouncements upon which taxpayers may rely), (c) the Buyer Plan and any associated trust have received a favorable determination letter from the Internal Revenue Service
stating that the Buyer Plan qualifies under Code Section 401(a), that the associated trust qualifies under Code Section 501(a) and, if applicable, that any cash or deferred arrangement under the Buyer Plan qualifies under Code Section 401(k), (d)
the Buyer Plan 

  

 27 

 
currently satisfies the requirements of Code Section 410(b), and (e) no contribution made to the Buyer Plan is subject to an excise tax under Code Section
4972. With respect to any pension plan (within the meaning of ERISA Section 3(2)), the “accumulated benefit obligation “ of Buyer with respect to the pension plan (as determined in accordance with Statement of Accounting Standards No. 87,
“Employers’ Accounting for Pensions”) does not exceed the fair market value of pension plan assets, or if it does, it does not have a material adverse effect on Buyer taken as whole. Buyer has not had a complete or partial withdrawal
from any multiemployer plan (any pension plan that is subject to the requirements of Subtitle E of Title IV of ERISA) which has resulted in material liability to Buyer which has not been satisfied, and Buyer would not become subject to any material
liability under ERISA if Buyer were to withdraw completely from all such multiemployer plans to which Buyer contributes or has an obligation to contribute. 
  
 4.21 Company Information. The documents referred to in Schedule 4.21 of this Agreement (the “Buyer’s SEC Documents”)
constitute all of the documents (other than preliminary material, pre-effective registration statements or registration statements relating to employee stock option or compensation plans) that the Company was required to file with the Securities and
Exchange Commission (the “SEC”) since December 31, 1999. Each of the Buyer’s SEC Documents has been duly filed, and when filed complied in all material respects with the requirements of the applicable form, statutes, rules and
regulations of the SEC. Each of the Buyer’s SEC Documents, as amended by any amendments duly filed with the SEC and referred to in Schedule 4.21, was complete and correct in all material respects as of the date filed and did not contain
any untrue statement of material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements made therein, in light of the circumstances in which made, not misleading. Since December 31, 1999,
there has not been any material adverse change in the condition (financial or otherwise) or results of operation of Buyer and its Subsidiaries. The audited financial statements of Buyer included in the Buyer’s SEC Documents have been prepared
in accordance with GAAP applied on a consistent basis during the periods involved (except as may be indicated in the notes thereto) and fairly present the consolidated financial position of Buyer and its subsidiaries as at the date thereof and the
consolidated results of their operations and cash flow for the periods then ended. The unaudited financial statements included in any Buyer’s SEC Documents comply as to form in all material respects with applicable accounting requirements and
with the published rules and regulations of the SEC with respect thereto; and such unaudited financial statements are fairly presented in conformity with GAAP (except as permitted by Form 10-QSB of the SEC) applied on a basis substantially
consistent with that of the audited financial statements included in the Buyer’s SEC Documents, subject to year-end audit adjustments. 
  
 ARTICLE V 
 CONDUCT OF BUSINESS PRIOR
TO THE CLOSING 
  
 5.1 Conduct of Business of the
Company. During the period commencing on the date hereof and continuing until the Closing Date, the Company agrees, and Sellers agree to cause the Company, to, except as otherwise expressly contemplated by this Agreement or agreed to in writing
by Buyer: 
  
 (a) carry on its business only in the ordinary
course and consistent with past practice; 
  

 28 

 (b) not declare or pay any dividend on or make any other distribution (however characterized) in respect
of the Partnership Interests, other than distributions of earnings consistent with past practices and a distribution of an amount equal to the assumed tax liability (determined in a manner consistent with past practices) of Sellers for 1999 and the
partial year during which the Closing occurs (the “Tax Distribution”), provided that Buyer shall be reasonably satisfied with the calculation of the Tax Distribution; 
  
 (c) not, directly or indirectly, redeem or repurchase, or agree to redeem or repurchase, any of its Partnership Interests;

  
 (d) not amend its Certificate of Limited Partnership or
Limited Partnership Agreement; 
  
 (e) not issue, dispose of, or
agree to issue or dispose of, any Partnership Interests, or any options, warrants, conversion rights, or other rights to acquire Partnership Interests, or any securities convertible into or exchangeable for Partnership Interests; 
  
 (f) not combine, split, or otherwise reclassify any of its Partnership
Interests; 
  
 (g) use its commercially reasonable efforts to
preserve intact its present business organization, keep available the services of its officers and key employees and preserve its relationships with material customers, suppliers and others having business dealings with it to the end that its
goodwill and ongoing business shall not be materially impaired at the Closing Date; 
  
 (h) not (i) make any capital expenditures in the aggregate in excess of $200,000, other than its planned purchase, during the first quarter of year 2000, of haul trucks for a total aggregate consideration of not more
than $1,678,320, (ii) enter into any license, distribution, reseller, joint venture, or other similar agreement, (iii) enter into or terminate any lease of, or purchase or sell, any real property, (iv) enter into any leases of personal property
involving in the aggregate in excess of $200,000 annually, (v) incur or guarantee any additional indebtedness for borrowed money, or (vi) create or permit to become effective any Encumbrance on its properties or material assets. 
  
 (i) not adopt or amend any Plan for the benefit of employees, or increase the
salary or other compensation (including, without limitation, bonuses or severance compensation) payable or to become payable to its employees or accelerate, amend or change the period of exercisability or the vesting schedule of options granted
under any stock option plan or agreements except as specifically required by the terms of such plans or agreements, or enter into any agreement to do any of the foregoing; 
  
 (j) pay its payables and collect its receivables in the ordinary course of business consistent with past practice and not
materially defer any purchases of inventory; 
  
 (k) not enter
into any Contract that restricts in any respect the Company from carrying on its business as conducted as of the date of this Agreement; 
  

 29 

 (l) not waive any material claims or rights; 
  
 (m) not act or omit from taking any action which would cause any of the
representations and warranties in Article III hereof to be inaccurate; 
  
 (n) promptly advise Buyer of the commencement of, or threat of (to the extent that such threat comes to the Knowledge of any Seller), any claim, action, suit, proceeding, or investigation against, relating to or involving the Company or any
of its officers, employees, agents or consultants or the transactions contemplated hereby; 
  
 (o) use its commercially reasonable efforts to maintain in full force and effect all insurance policies maintained by the Company on the date hereof; 
  
 (p) not enter into any agreement to dissolve, merge, consolidate, or, except in the ordinary course, sell any material
assets of the Company, or acquire or agree to acquire by merging or consolidating with, or by purchasing a substantial equity interest in or substantial portion of the assets of, or by any other manner, any business or any corporation, partnership,
or other business organization or division, or otherwise acquire or agree to acquire any assets in excess of $200,000 in the aggregate; 
  
 (q) maintain its books of account in accordance with GAAP consistently applied, not change the Company’s method of accounting and not make any Tax
elections that could reasonably be expected to adversely affect Buyer or its subsidiaries without the consent of Buyer; 
  
 (r) materially comply with all Laws; 
  
 (s) maintain its properties and assets in sufficient operating condition and repair to enable it to operate in all material respects in the manner in
which it currently operates; and 
  
 (t) not enter into any
Contract with any Person to do any of the foregoing. 
  
 ARTICLE
VI 
 ADDITIONAL AGREEMENTS AND COVENANTS 
  

6.1 Access to Properties and Records; Confidentiality. 
  

(a) From the date of this Agreement until the earlier to occur of the Closing Date or the termination of this Agreement pursuant to Article IX hereof,
the Company will, and Sellers will cause the Company to, provide access to Buyer and its representatives at mutually agreeable times to all facilities of and information regarding the Company including, without limitation, its operations, reserves,
financial, and environmental condition. Buyer agrees not to contact any of MLO’s employees or customers without the prior written consent of Michael D. Lundin, President of MLO. 
  

 30 

 (b) From the date of this Agreement until the earlier to occur of the Closing Date or the termination of
this Agreement pursuant to Article IX hereof, Buyer will provide access to Sellers and their representatives at mutually agreeable times to all facilities of and information regarding the Port Inland Quarry including, without limitation, its
operations, reserves, financial, and environmental condition. Sellers agree not to contact any of Buyer’s employees or customers without the prior written consent of Buyer. 
  
 (c) Unless and until the Closing has been consummated, Buyer and Sellers shall hold, and shall cause their respective
counsel, accountants, financial advisors, appraisers and investment bankers to hold, in confidence any confidential data or information made available to such party by the other or the Company in connection with this Agreement or the transactions
contemplated by this Agreement with respect to the Company or Buyer, including any information provided pursuant to this Section 6.1 in accordance with the terms and conditions of the Confidentiality Agreement. If the transactions contemplated by
this Agreement are not consummated, Buyer and Sellers shall return or cause to be returned to each other all written materials and all copies thereof that were supplied to each of them by the other or the Company in connection with this Agreement.
Unless and until the Closing has been consummated, the terms and conditions of the Confidentiality Agreement shall continue as provided therein. 
  
 6.2 Transfer of Interests. Sellers agree that they (a) shall not dispose of or in any way encumber their Interests prior to the consummation of the
transactions contemplated by this Agreement, and (b) shall use their commercially reasonable efforts to cause, and take no action inconsistent with, the approval and consummation of such transactions. 
  
 6.3 Reasonable Efforts. Subject to the terms and conditions herein
provided, each of the parties hereto agrees to use its commercially reasonable efforts to take, or cause to be taken, all actions, and to do, or cause to be done, all things reasonably necessary, proper, or advisable under applicable Laws to
consummate and make effective the transactions contemplated by this Agreement, including obtaining any consents, authorizations, exemptions, and approvals from, and making all filings with, any governmental or regulatory authority, agency, or body
which are necessary in connection with the transactions contemplated by this Agreement. Without limiting the foregoing, each party shall at their own expense promptly file, or, in the case of Sellers cause MLO to file, the notification required of
it under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, 15 U.S.C. Section 18a, and the rules promulgated thereunder (the “HSR Act”); provided that Buyer shall pay all expenses incurred by Buyer and Sellers or
MLO in responding to any second request under the HSR Act. 
  
 6.4
Material Events. At all times prior to the Closing Date, each party shall promptly notify the others in writing of the occurrence of any event which will or may result in the failure to satisfy any of the conditions specified in Articles V,
VII and VIII hereof. 
  
 6.5 Fees and Expenses. Except as
provided in Section 6.3, each party hereto shall bear and pay all its own fees, costs, and expenses relating to the transactions contemplated by this Agreement, including, without limitation, the fees and expenses of its counsel, accountants,
brokers, and financial advisors. 
  

 31 

 6.6 Further Assurances. At any time from time to time after the Closing, the Parties shall execute
and deliver such other documents and instruments, provide such materials and information, and take such other actions as the other Parties may reasonably request to carry out the purposes of this Agreement, to vest more effectively title in the
Interests in Buyer, and to fulfill their obligations under this Agreement all at the sole cost and expense of the requesting Party. 
  
 6.7 Public Announcements. No party hereto shall make any public announcement or public disclosure or issue any press release concerning this
Agreement and the transactions contemplated hereby without the prior written consent of the other parties; provided that Buyer shall be permitted to make any disclosures required by federal securities laws. 
  
 6.8 Property Taxes. Sellers shall cause, or shall have caused, the
Company to pay all ad valorem, property, real estate, personal property, and similar taxes that first become due and payable on or prior to the Closing Date. Buyer shall be responsible for all ad valorem, property, real estate, personal property,
and similar taxes that first become due and payable after the Closing Date. 
  
 6.9 Transfer Taxes. With respect to all sales, use, value added, transfer, recordation, realty transfer, and conveyance taxes and other similar taxes and fees, applicable to the transactions contemplated by
this Agreement, Buyer, on the one hand, and Sellers, on the other hand, each agree to pay one-half of such taxes and fees; provided that notwithstanding anything to the contrary under this Agreement, Buyer shall pay all such taxes in excess of
$30,000 and Sellers shall have no liability for such taxes in excess of $15,000. 
  
 6.10 Michigan Single Business Taxes. 
  
 (a) On or before the Closing Date, Sellers shall cause the Company to: 
  
 (i) prepare and file all Michigan Single Business Tax Returns (“SBT Return”) for the Company for any tax period ending before the Closing Date
for which an SBT Return is required to be filed on or before the Closing Date and pay Michigan Single Business Taxes for such period (“SBT”), or 
  
 (ii) obtain an extension of time for the filing of such SBT Return for such period, pay all SBT required to be paid in connection with the filing of such
extension and provide an adequate charge, accrual or reserve for any additional amount of SBT required to be paid in connection with the filing of the SBT Return to which such extension relates. 
  
 (b) After the Closing Date, Buyer, on behalf of the Company, shall cause to
be prepared and filed the Company’s final SBT Return for the tax period ending on the Closing Date (for which an SBT Return is required to be filed after the Closing Date), and, notwithstanding Section 3.24(a), shall pay and be responsible for
the SBT required to be paid in connection with such SBT Return. Any refund of SBT due to the Company with respect to a period ending on or before the Closing Date, at Sellers’ option, shall be applied as a credit against any SBT required to be
paid on behalf of the Company under this subsection (b) or shall be paid to Sellers. 
  

 32 

 (c) Buyer shall be responsible for the filing of all SBT Returns and payment of all SBT for tax periods
beginning after the Closing Date. 
  
 (d) If for any reason a
Taxing Authority makes a determination, which becomes final, that there is a Company tax period which begins before the Closing Date and ends after the Closing Date, then any SBT liability for such period shall be Buyer’s responsibility.

  
 6.11 FIRPTA Certificates. Prior to the Closing Date,
each of Sellers shall deliver an executed certificate to Buyer, as described in Treasury Regulation Section 1.1445-2, certifying that such respective Seller is not a “foreign person” within the meaning of Section 1445(f)(3) of the Code.
For those Sellers, if any, that do not so provide such a certificate, Buyer will withhold a pro rata portion of the purchase price properly allocated to the disposition of a real property interest and pay over such amount to the Internal Revenue
Service as required by Section 1445 of the Code. 
  
 6.12
Cooperation and Exchange of Information. 
  
 (a) Sellers
and Buyer agree that they intend that the transaction contemplated by this Agreement will be one described within Situation 2 of Revenue Ruling 99-6, I.R.B. 6, with the federal income tax consequences as described therein, and that they will
cooperate in structuring such transaction to minimize Tax liabilities resulting from carrying it out. 
  
 (b) The parties will provide each other with such cooperation and information as either of them reasonably may request of the other in filing any Tax
Return, determining a liability for Taxes or a right to a refund of Taxes, or participating in or conducting any audit or other proceeding in respect of Taxes. Such cooperation and information shall include providing copies of relevant Tax Returns
or portions thereof, together with accompanying schedules and related work papers and documents relating to rulings or other determinations by Taxing Authorities. Any information obtained under this Section 6.13 shall be kept confidential except as
may be necessary in connection with the filing of Tax Returns or in conducting an audit or other proceeding. The parties further agree, upon request, to use all reasonable efforts to obtain any certificate or other document from any governmental
authority, Taxing Authority, or customer of MLO, MLO-Ohio and MEL or Buyer or any other person as may be necessary to mitigate, reduce or eliminate any Tax that could be imposed (including but not limited to with respect to the transactions
contemplated by this Agreement). 
  
 (c) Upon the reasonable
request of a Party for a proper business purpose, the other Party shall make available its personnel and access to its books and records related to the MLO Quarries, the Port Inland Quarry, or the Operations as shall be necessary in connection with
such business purpose, all at the sole cost and expense of requesting Party. 
  
 6.13 Litigation Support. In the event and for so long as any Party actively is contesting or defending against any action, suit, proceeding, hearing, investigation, charge, complaint, claim or demand in
connection with any fact, situation, circumstance, status, condition, activity, practice, plan occurrence, event, incident, action, failure to act, or transaction on or prior to the 

  

 33 

 
Closing Date involving the Company and brought by a third party, the other Party shall cooperate with the contesting or defending Party and its counsel in
the contest or defense, make available its personnel, and provide such testimony and access to its books and records as shall be necessary in connection with the contest or defense, all at the sole cost and expense of the contesting or defending
Party (unless the contesting or defending Party is entitled to indemnification therefor under Section 10). 
  
 6.14 Formation of Limited Liability Company. Prior to the Closing Date, a single member Delaware limited liability company (“New
LLC”) shall be formed whose sole member is MLO and Sellers shall cause MLO to transfer and convey to New LLC the assets of MLO identified on Schedule 6.14. 
  
 6.15 Sellers’ Representative. Pursuant to the Sellers’ Representative Agreement, the Sellers have appointed
the Sellers’ Representative to act as each such Seller’s representative, attorney-in-fact and agent, with full power and authority to do all of the following: 
  
 (a) execute and deliver and receive, on behalf of each Seller, all amendments, certificates, statements, notices, consents,
approvals, extensions, waivers, and undertakings required or permitted to be made, given, or delivered under this Agreement or in connection with the transactions contemplated by this Agreement; 
  
 (b) receive any amount delivered by Buyer to such Seller pursuant to this
Agreement; 
  
 (c) respond to and make determinations with respect
to the assertion of any claims for indemnification by Buyer and to assert claims on behalf of such Seller pursuant to the terms of this Agreement; and 
  
 (d) take all such other actions as may be necessary or desirable to carry out his responsibilities as Sellers’ Representative. 
  
 Buyer shall be entitled to rely, without further inquiry, on the authority of Sellers’
Representative to take any action pursuant to this Agreement for or on behalf of each Seller and shall be entitled to make any payments required to be made by Buyer to Sellers hereunder to Sellers’ Representative. If Sellers’
Representative (or his successor or assign) shall resign, become incapacitated, die or otherwise cease to perform the duties as the Sellers’ Representative, his successor (chosen pursuant to the terms of the Sellers’ Representative
Agreement) shall become the Sellers’ Representative and shall provide written notice to Buyer of his name, address, telephone number, and facsimile number. 
  

6.16 Intentionally omitted. 
  
 6.17 Shareholder Loans. 
  
 (a) At Closing, Michael Lundin and Kent Rhude shall repay to MLO all principal and interest owed to MLO and evidenced by those notes identified on
Schedule 6.17(a) (the “Shareholder Notes”). 
  

 34 

 (b) At Closing, MLO shall repay to National City Bank (the “Bank”) all principal and interest
evidenced by those notes identified on Schedule 6.17(b) (the “Shareholder Indebtedness”). The Shareholder Indebtedness is secured in part by a pledge of the Shareholder Notes. Immediately upon receipt of the Shareholder Notes from
the Bank, MLO (or Buyer if received by Buyer) shall cancel the Shareholder Notes and deliver them to Michael Lundin and Kent Rhude. 
  
 (c) To facilitate the transactions described in Section 6.17(a) and (b), pursuant to letters of direction from Michael Lundin, Kent Rhude and MLO, Buyer
may wire transfer directly to the Bank a portion of the Cash Purchase Price equal to the amount of the Shareholder Indebtedness and receive a credit against the Cash Purchase Price equal to such amount. 
  
 6.18 Employee Benefits Matters. 
  
 (a) As soon as practicable after the Closing Date, but in no event more than
ninety (90) days after such date, Sellers shall cause Sellers’ Advisors (such term to include attorneys, accountants, actuaries and other professionals selected by Sellers) to prepare and make a filing with the Internal Revenue Service
(“IRS”) pursuant to the EPCRS program, to review those matters relating to the Michigan Limestone Operations Limited Partnership 401(k) Plan For Salaried Employees which are disclosed on Schedule 3.15 which may affect the qualified status
of such plan. Sellers shall be solely and absolutely responsible for payment of all filing fees, expenses and penalties associated with Sellers’ Advisors preparing, making and responding to the IRS in connection with such EPCRS filing and
implementing all remedial actions requested by the IRS. In addition, but not by way of limitation, Sellers shall reimburse Buyer for the full amount which Buyer is required to contribute to such plan or otherwise pay in connection with such EPCRS
filing in order to finalize such filing and receive approval from the IRS of the correction methodology proposed by Sellers in this regard. 
  
 (b) As soon as practicable after the Closing Date but in no event more than ninety (90) days after such date, Sellers shall cause Sellers’ Advisors
to prepare and make a filing with the IRS pursuant to the EPCRS program, to review those matters relating to the Michigan Limestone Operations Limited Partnership Pension Plan For Salaried Employees which are disclosed on Schedule 3.15 which may
affect the qualified status of such plan. Sellers shall be solely and absolutely responsible for payment of all filing fees, expenses and penalties associated with Sellers’ Advisors preparing, making and responding to the IRS in connection with
such EPCRS filing and implementing all remedial actions requested by the IRS. In addition, but not by way of limitation, upon finalization of such EPCRS filing and receipt of approval from the IRS of the correction methodology required in this
regard, Sellers shall promptly pay Buyer that amount as determined by Sellers’ actuaries, equal to the excess (if any) of the present value of all accrued benefits under such plan (as modified in connection with such EPCRS filing) as of the
Resolution Date, over the market value of the plan’s assets as of such date. For purposes of this Section 6.18(b), “Resolution Date” shall mean the date a definitive written agreement is entered into between Buyer or one of its
Affiliates and the IRS resolving matters described in this Section 6.18(b). 
  

 35 

 (c) Buyer agrees to cooperate with Sellers to execute such documents (including, but not limited to,
powers of attorney naming Sellers’ Advisors) and take any and all such actions as Sellers reasonably determine are necessary or advisable to facilitate resolution of the EPCRS filings described above. Sellers agree to consult with Buyer
regarding such EPCRS filings and keep Buyer apprised of the status of such filings, but Sellers shall retain sole authority and discretion with regard to such filings. Sellers agree that prior to taking any action associated with the EPCRS program,
Sellers will provide notice to Buyer of such action and provide Buyer with a reasonable opportunity to review and comment on any such action, and Sellers agree to consider any such comments in good faith with respect to such action. Sellers shall
retain sole authority and discretion with regard to (i) the identity of Sellers’ Advisors (whose engagement shall be subject to Buyer’s prior approval, which shall not be unreasonably withheld) that will assist Sellers in connection with
such filings and in negotiations with the IRS; (ii) the assumptions (including actuarial assumptions) to be utilized by such Sellers’ Advisors in preparing, making and responding to the IRS in connection with such filings; and (iii) the
specific methods of any and all corrections to be proposed, negotiated and finalized with the IRS with respect to such filings. Notwithstanding the foregoing, Buyer agrees that Dykema Gossett PLLC, Calfee, Halter & Griswold LLP and Investmart,
Inc. are acceptable to Buyer as Sellers’ Advisors, and Seller agrees that the discount rate to be used for purposes of (ii) above shall be eight percent (8%). 
  
 (d) For all purposes of this section 6.18, any action required to be taken by Seller shall be taken by Sellers’
Representative on behalf of Seller. 
  
 ARTICLE VII

 CONDITIONS TO THE OBLIGATIONS OF BUYER 
  

The obligation of Buyer to consummate the transactions contemplated hereby shall be subject to the satisfaction, on or prior to the Closing Date, of
each of the following conditions (any of which may be waived in writing by Buyer in its sole discretion): 
  
 7.1 Representations and Warranties True. The representations and warranties of Sellers which are contained in this Agreement, or contained in any
Schedule, certificate, or instrument delivered or to be delivered pursuant to this Agreement, shall be true and correct in all material respects on the date hereof (except to the extent such representations and warranties speak as of an earlier
date) and shall also be true and correct on and as of the Closing Date as if made on and as of the Closing Date, and at the Closing each of Sellers shall have delivered to Buyer a certificate to that effect with respect to all such representations
and warranties made by Sellers. Notwithstanding the foregoing, the representations and warranties of Sellers shall not be deemed incorrect as a result of the formation of the New LLC and the transfer of assets identified on Schedule 6.14 as
contemplated by Section 6.14. 
  
 7.2 Performance. MLO and
each of Sellers shall have performed and complied with all of the obligations under this Agreement which are required to be performed or complied with by them on or prior to the Closing Date, and at the Closing Sellers shall have delivered to Buyer
a certificate to that effect with respect to all such obligations required to have been performed or complied with by MLO and Sellers on or before the Closing Date. 
  

 36 

 7.3 Absence of Litigation. No Law enacted, promulgated, or issued which restrains, enjoins or
otherwise prohibits the consummation of the transactions contemplated hereby, and no action, suit, or proceeding before any court or governmental or regulatory body, agency or authority shall have been instituted by any Person (or instituted or
threatened by any governmental or regulatory body, agency or authority), and no investigation by any governmental or regulatory body, agency, or authority shall have been commenced with respect to the transactions contemplated hereby or with respect
to the Company or any of Sellers which would have a material adverse effect on the transactions contemplated hereby or have a Material Adverse Effect. 
  
 7.4 Consents and Approvals. All approvals, consents, waivers, amendments, and authorizations listed on Schedule 3.21 and required to be
obtained by MLO or any Seller in connection with the transactions contemplated by this Agreement shall have been obtained and shall be in full force and effect. All Sellers shall have voted in favor of the approval of this Agreement and the
transactions contemplated hereby. 
  
 7.5 Intentionally
omitted. 
  
 7.6 Intentionally omitted. 
  
 7.7 Noncompetition Agreements. Each of the parties identified on
Schedule 7.7(a) shall have entered into and delivered to Buyer a noncompetition agreement in the form of Exhibit 7.7(b) attached hereto. 
  
 7.8 Supporting Documents. Sellers shall have delivered to Buyer a certificate certifying that (i) attached thereto is a true and complete copy of
the Limited Partnership Agreement of MLO as in effect on the date of such certification, and (ii) attached thereto is a true and complete copy of all resolutions adopted by the general and limited partners of MLO authorizing the execution, delivery
and performance of this Agreement., Each Seller shall have delivered to Buyer assignments transferring to Buyer (and/or to one or more of Buyer’s affiliates, as the case may be) all rights in and to the Interests held by such Seller.

  
 7.9 Other Documents. MLO and/or Sellers shall have
delivered to Buyer such other agreements, documents and instruments contemplated by this Agreement, including documents and instruments evidencing the completion of the transactions referred to in Section 6.14 and the receipt of all required
consents in connection therewith, and such other items as Buyer may reasonably request. 
  

 37 

 ARTICLE VIII 
 CONDITIONS TO THE OBLIGATIONS OF SELLERS 
  
 The obligation of Sellers to consummate the transactions contemplated by this Agreement shall be subject to the satisfaction, on or prior to the Closing Date, of each of the following conditions (any of which may be
waived in writing by Sellers in their sole discretion): 
  
 8.1
Representations and Warranties True. The representations and warranties of Buyer contained in this Agreement, or contained in any Schedule, certificate, or other instrument or document delivered or to be delivered pursuant to this Agreement,
shall be true and correct in all material respects on the date hereof (except to the extent such representations and warranties speak as of an earlier date) and shall also be true and correct on and as of the Closing Date as if made on and as of the
Closing Date, and at the Closing Buyer shall have delivered to Sellers a certificate (signed on its behalf by a duly authorized officer) to that effect with respect to all such representations and warranties made by Buyer. 
  
 8.2 Performance. Buyer shall have performed and complied with all of
the obligations under this Agreement which are required to be performed or complied with by it on or prior to the Closing Date, and at the Closing Buyer shall have delivered to Sellers a certificate, signed on its behalf by a duly authorized
officer, to that effect with respect to all such obligations required to have been performed or complied with by it on or before the Closing Date. 
  
 8.3 Absence of Litigation. No Law shall have been enacted, promulgated, or issued which restrains, enjoins, or otherwise prohibits the consummation
of the transactions contemplated hereby, and no action, suit, or proceeding before any court or governmental or regulatory body, agency, or authority shall have been instituted by any Person (or instituted or threatened by any governmental or
regulatory body, agency, or authority), and no investigation by any governmental or regulatory body, agency, or authority shall have been commenced with respect to the transactions contemplated hereby or with respect to Buyer which would have a
material adverse effect on the transactions contemplated hereby or on the business of Buyer taken as a whole. 
  
 8.4 Consents. All approvals, consents, waivers, and authorizations required to be obtained by Buyer in connection with the transactions
contemplated by this Agreement shall have been obtained and shall be in full force and effect. 
  
 8.5 Supporting Documents. Buyer shall have delivered to Sellers a certificate of an officer of Buyer, dated the Closing Date, certifying on behalf of Buyer (a) that attached thereto is a true and complete copy
of the By-Laws of Buyer as in effect on the date of such certification; (b) that attached thereto is a true and complete copy of all resolutions adopted by the Board of Directors of Buyer authorizing the execution, delivery and performance of this
Agreement; and (c) to the incumbency and specimen signature of each officer of Buyer executing on behalf of Buyer this Agreement and the other agreements related hereto. 
  

 38 

 8.6 Other Documents. Buyer shall have delivered to Sellers such other agreements, documents and
instruments contemplated by this Agreement and such other items as Sellers may reasonably request. 
  
 ARTICLE IX 
 TERMINATION 
  
 9.1 Termination. This Agreement may be terminated at any time prior to
the Closing Date: 
  
 (a) by the mutual written consent of Buyer
and Sellers; 
  
 (b) by either Buyer or Sellers: 
  
 (i) if any court or governmental or regulatory agency, authority, or body of
competent jurisdiction shall have enacted, promulgated, or issued any statute, rule, regulation, ruling, writ, or injunction, or taken any other action, restraining, enjoining, or otherwise prohibiting the transactions contemplated hereby and all
appeals and means of appeal therefrom have been exhausted; or 
  
 (ii) if the Closing shall not have occurred on or before December 11, 2000; provided, however, that the right to terminate this Agreement pursuant to this Section 9.1(b)(ii) shall not be available to any party whose breach of any
representation or warranty or failure to perform or comply with any obligation under this Agreement has been the cause of, or resulted in, the failure of the Closing to occur on or before such date; 
  
 (c) by Buyer: 
  
 (i) if Buyer does not have sufficient funds to pay the Cash Purchase Price at the Closing as a result of one or more of its
lenders refusing to provide funding as the result of adverse conditions affecting the financial markets generally; 
  
 (ii) if any of the conditions specified in Article VII have not been met or waived prior to such time as such condition can no longer be satisfied; or

  
 (iii) if there has been a material misrepresentation by any
Seller or MLO or a breach by any Seller or MLO of any of their representations, warranties, covenants, or other obligations hereunder, such breach results in a Material Adverse Effect, and such breach shall not have been cured within ten (10) days
after written notice thereof has been delivered by Buyer to Sellers; or 
  
 (d) by Sellers: 
  
 (i) if any of the conditions
specified in Article VIII shall not have been met or waived prior to such time as such condition can no longer be satisfied; or 
  

 39 

 (ii) if there has been a material misrepresentation by Buyer or a breach by Buyer of any of its
representations, warranties, covenants, or other obligations hereunder, such breach results in a Material Adverse Effect, and such breach shall not have been cured within ten (10) days after written notice thereof has been delivered by Sellers to
Buyer. 
  
 9.2 Effect of Termination. In the event of
termination of this Agreement, this Agreement shall forthwith become void, and there shall be no liability on the part of any of the parties hereto or their respective officers or directors, except that nothing herein shall relieve any party from
liability for a breach of this Agreement prior to the termination hereof. Notwithstanding the foregoing, (a) in the event that Buyer terminates this Agreement pursuant to Section 9.1(c)(iii) and Sellers and/or MLO enter into any transaction for the
sale of the Partnership Interests or all or any substantial portion of the assets of MLO prior to December 11, 2001 without the prior written consent of Buyer, then Sellers and MLO, jointly and severally, shall pay to Buyer an aggregate amount equal
to $7,500,000 (the “Sellers’ Termination Fee”), and (b) in the event, Buyer terminates this Agreement for any reason other than (i) pursuant to Section 9.1(c)(i) or (iv), or (ii) a Material Adverse Effect between the date of
this Agreement and the Closing Date, then Oglebay shall pay to Sellers an aggregate amount equal to $7,500,000 (the “Buyer’s Termination Fee”). Notwithstanding any of the foregoing, no Termination Fee shall be payable by any
party hereto in the event this Agreement is terminated due to the failure to obtain any necessary approval under the HSR Act. 
  
 ARTICLE X 
 INDEMNIFICATION

  
 10.1 Indemnification by Sellers. Each Seller,
severally and not jointly, hereby agrees to defend, indemnify, and hold harmless Buyer, and shall reimburse Buyer for, from and against each claim, loss, liability, cost, and expense (including reasonable attorney’s fees), all such items to be
net of any tax benefits and insurance proceeds recovered or recoverable by Buyer (collectively, “Losses”), to the extent resulting from or arising out of any breach of any representation or warranty or covenant of such Seller
contained in this Agreement or any agreement, document, or instrument delivered in connection with or pursuant to this Agreement. 
  
 10.2 Indemnification by Buyer. Buyer hereby agrees to defend, indemnify, and hold harmless Sellers and shall reimburse Sellers for, from and
against all Losses to the extent resulting from or arising out of any breach of any representation or warranty or covenant of Buyer contained in this Agreement or in any agreement, document, instrument delivered in connection with or pursuant to
this Agreement. The term “Losses” shall include a decrease in the amount of any Contingent Payment that is directly attributable to Buyer’s material breach of a representation or warranty of Buyer set forth in this Agreement.

  
 10.3 Procedure. 
  
 (a) The indemnified party shall promptly notify in writing the indemnifying
party of any claim, demand, action, or proceeding for which indemnification will be sought under Sections 10.1 or 10.2 of this Agreement, and, if such claim, demand, action, or proceeding is a third party claim, demand, action, or proceeding, the
indemnifying party will have the right at its 

  

 40 

 
expense to assume the defense thereof using counsel reasonably acceptable to the indemnified party; provided, however, in the case of any claim (an
“Excess Claim”) in which the indemnified party’s aggregate Losses could exceed the indemnifying party’s aggregate liability pursuant to Section 10.3(b), the indemnifying party will have the right, at its expense, to assume
the defense thereof only with the indemnified party’s written consent. The failure to provide such prompt notice shall not affect the indemnification provided hereunder except to the extent, if any, the indemnifying party shall have been
actually prejudiced as a result of such delay or failure. Should the indemnifying party assume the defense of such a third party claim, demand, action, or proceeding or should the indemnified party unreasonably withhold its consent to the assumption
by the indemnifying party of the defense of any Excess Claim, the indemnifying party shall not be liable to the indemnified party for legal expenses subsequently incurred by the indemnified party in connection with the defense thereof. The
indemnified party shall have the right to participate, at its own expense, with respect to any such third party claim, demand, action, or proceeding, it being understood that the indemnifying party shall control any defense assumed by the
indemnifying party. In connection with any such third party claim, demand, action, or proceeding, Buyer and Seller shall cooperate with each other and provide each other with reasonable access to and retain all relevant books and records in their
possession. No such third party claim, demand, action, or proceeding shall be settled without the prior written consent of the indemnified party. If a firm written offer is made to settle any such third party claim, demand, action, or proceeding,
which offer includes an unconditional provision providing for the giving by the claimant to the indemnified party of a release from all liability in respect of such claim, demand, action, or proceeding and does not require any payment by the
indemnified party or impose any other obligations (such as an affirmative action, negative covenant, or equitable relief) upon the indemnified party and the indemnifying party proposes to accept such settlement and the indemnified party refuses to
consent to such settlement, then: (i) the indemnifying party shall be excused from, and the indemnified party shall be solely responsible for, all further defense of such third party claim, demand, action or proceeding; and (ii) the maximum
liability of the indemnifying party relating to such third party claim, demand, action or proceeding shall be the amount of the proposed settlement if the amount thereafter recovered from the indemnified party on such third party claim, demand,
action or proceeding is greater than the amount of the proposed settlement. Whether or not the indemnifying party shall have assumed the defense of any such third party claim, action, demand or proceeding, no indemnified party shall admit any
liability with respect to, or settle, compromise or discharge any such claim, demand, action or proceeding without the indemnifying party’s prior written consent, which shall not be unreasonably withheld. 
  
 (b) Buyer and Sellers shall cooperate with each other with respect to
resolving any claim or liability with respect to which one party is obligated to indemnify any other Person hereunder, including by making commercially reasonable efforts to mitigate or resolve any such claim or liability. In the event that Buyer or
Sellers shall fail to make such commercially reasonable efforts to mitigate or resolve any claim or liability, then notwithstanding anything else to the contrary herein, the other party shall not be required to indemnify any Person for any Losses
that could reasonably be expected to have been avoided if Buyer or Sellers, as the case may be, had made such efforts. 
  

 41 

 10.4 Maximum Liability; Deductible. 
  
 (a) Notwithstanding any provision contained herein to the contrary (but subject to Section 10.4(c) below), (i) Sellers shall
have no liability under Section 10.1 unless the aggregate of all Losses to which Buyer shall be entitled to indemnification pursuant to Section 10.1 hereof exceeds on a cumulative basis an amount equal to $300,000 in which event such parties shall
be liable for all Losses in excess of such amount; (ii) in no event shall the aggregate liability of Sellers under Section 10.1 exceed $21,000,000 (the “Cap”); provided that the Cap shall be reduced each year during the Tonnage
Payment Period by the amount of any Tonnage Payments paid by Buyer pursuant to Subsection 2.3(a); and (iii) in no event shall the aggregate liability of Sellers under Section 10.1 with respect to all representations and warranties other than Section
3.16, exceed $10,000,000 (the “Non-Environmental Cap”); provided that the Non-Environmental Cap shall be reduced annually on a proportionate basis, i.e., by an amount equal to 0.476 times the amount of any Tonnage Payment
paid by Buyer pursuant to Section 2.3(a). Notwithstanding the foregoing provisions on the reduction of the Cap, upon the occurrence of (x) a Termination Event, or (y) an Acceleration Event of the type described in Section 2.3(g)(ii)(1) (Buyer’s
sale of all or substantially all of the assets or equity interests relating to the Operations) or 2.3(g)(iii) (the occurrence of an Event of Default), the Cap and the Non-Environmental Cap shall both be reduced to zero dollars; provided, however,
that if Sellers are entitled to the Accelerated Payment pursuant to Section 2.3(g)(ii)(B) (Fundamental Change), then, (1) the Cap shall be reduced to the amount of the Accelerated Payment and the Non-Environmental Cap to an amount equal to 0.476
times the amount of the Accelerated Payment and (2) in each subsequent year, the Cap shall be further reduced by an amount equal to the Accelerated Payment divided by the number of years remaining at the time of the Accelerated Payment comes due and
owing in the Tonnage Payment Period (which shall not be more than ten (10) minus the number of years in which Sellers had previously received a Tonnage Payment) and the Non-Environmental Cap shall be reduced by 0.476 times such amount. The
limitations set forth in this Section 10.4(a) shall not apply to any breach of the representations and warranties set forth in Sections 3.1, 3.4, 3.10 with respect to title to property, and 3.24 and the covenants set forth in Section 6.8, 6.9, and
6.10. 
  
 (b) Sellers’ obligations to indemnify Buyer under
this Article X with respect to any breach of Sections 3.1, 3.4 and 3.10 with respect to title to property, and 3.24 and the covenants set forth in Sections 6.8, 6.9, and 6.10 shall be satisfied first by an offset against the Tonnage Payments due
during the Tonnage Payment Period and thereafter from payments from Sellers. Except as set forth in the preceding sentence, Sellers’ obligations to indemnify Buyer under this Article X shall be satisfied solely by an offset against the Tonnage
Payments, and Buyer shall have no further recourse against Sellers. To the extent that the Tonnage Payments in any one year are insufficient to satisfy the indemnification obligations of Sellers under this Article X, Buyer may satisfy such
indemnification obligations by an offset against subsequent Tonnage Payments coming due in later years during the Tonnage payment Period. Notwithstanding the foregoing, if Buyer has paid the Accelerated Payment, Sellers’ obligations to
indemnify Buyer under this Article X shall be satisfied by payments from Sellers but only to the extent of the existing Cap or the Non-Environmental Cap, as applicable, as reduced pursuant to Section 10.4(a). 
  

 42 

 (c) Neither the deductible referred to in Section 10.4(a)(i) nor the Cap shall apply to Sellers
obligations under Section 6.18 of this Agreement, it being understood that Sellers obligations thereunder shall be absolute. 
  
 10.5 Survival. 
  
 (a) Subject to Section 10.5(b) below, all representations and warranties by the parties contained in this Agreement or in any certificate delivered
pursuant hereto shall survive the Closing solely for purposes of Section 10.1 and 10.2 and shall terminate on the date which is eighteen (18) months after the Closing Date. 
  
 (a) The representations and warranties contained in Section 3.16 of this Agreement shall survive for a period of ten years,
the representations and warranties contained in Section 3.24 of this Agreement shall survive for the full period of all applicable statutes of limitations, and the covenants in this Agreement shall survive until fully performed. 
  
 10.6 Exclusive Remedy. The remedy provided for in this Article X is
the exclusive remedy of a Party for any claim that arises under this Article X; provided that this Section 10.6 shall not prevent any party from seeking or obtaining specific performance, injunctive relief or other equitable remedies. 
  
 10.7 Limitation. No Losses shall be asserted by a Party which arise
out of any breach or inaccuracy of any representation, warranty, or covenant made by the other Party if the Party had actual knowledge of such breach or inaccuracy on the Closing Date. 
  
 ARTICLE XI 
 MISCELLANEOUS PROVISIONS 
  
 11.1 Contents of
Agreement. The Confidentiality Agreement, this Agreement, together with the Schedules, the Side Letter, certificates, and other instruments and documents delivered pursuant hereto, embodies the entire understanding of the parties hereto with
respect to the subject matter hereof, and supersedes all prior agreements or understandings among the parties regarding those matters. 
  
 11.2 Amendment, Waiver; Parties in Interest, Etc. 
  
 (a) This Agreement may be amended, modified, or supplemented only by a written instrument duly executed by each of the parties hereto, which writing makes
express reference to this Section 11.2. If any provision of this Agreement shall for any reason be held to be invalid, illegal, or unenforceable in any respect, such invalidity, illegality, or unenforceability shall not affect any other provision
hereof, and this Agreement shall be construed as if such invalid, illegal, or unenforceable provision had never been contained herein. 
  
 (b) Any term or provision of this Agreement may be waived at any time by the party entitled to the benefit thereof by a written instrument duly executed
by such party. Any such waiver shall constitute a waiver only with respect to the specific matter described in such writing 

  

 43 

 
and shall in no way impair the rights of the party granting such waiver in any other respect or at any other time. Neither the waiver by either of the
Parties of a breach of or a default under any of the provisions of this Agreement, nor the failure by any of the Parties, on one or more occasions, to enforce any of the provisions of this Agreement or to exercise any right or privilege hereunder,
shall be construed as a waiver of any other breach or default of a similar nature, or as a wavier of any of such provisions, rights or privileges hereunder. 
  
 (c) This Agreement is being made and entered into solely for the benefit of Buyer, Sellers, and MLO, and none of Buyer, Sellers, or MLO intends hereby to
create any rights in favor of any other Person, as a third party beneficiary of this Agreement or otherwise. The Parties acknowledge and agree that nothing in this Agreement creates an employment agreement between Buyer and Michael D. Lundin or
creates any obligation of Buyer to employ for any period of time, or provide any benefits to, Michael D. Lundin. 
  
 11.3 Assignment. 
  
 (a) Buyer may assign any or all of its rights hereunder to any direct or indirect wholly-owned subsidiary of Buyer (a “Permitted Subsidiary
Transferee”), and Buyer shall advise Sellers of any such assignment and shall designate such party as the assignee and transferee. In the event of such assignment, the Permitted Subsidiary Transferee may not assign any rights hereunder to
any Person not a direct or indirect wholly-owned subsidiary of Buyer. The transfer of any ownership interest in a Permitted Subsidiary Transferee shall constitute an assignment in violation of Section 11.3(a), and such assignment shall be void. Any
permitted assignment shall not be deemed to release Buyer from its obligations hereunder and Buyer shall remain fully liable for performance of all obligations under this Agreement. 
  
 (b) One or more of Sellers may distribute all of its rights under this Agreement to its shareholders (the
“Sellers’ Shareholders”). Any such distribution shall not be deemed to release such Seller from its obligations hereunder, and such Seller shall remain fully liable for performance of all obligations under this Agreement. A
Sellers’ Shareholder shall have discretion to transfer, by gift, sale, or bequest (or other transfer effective upon death), all or any portion of his or her rights under this Agreement to (i) his or her spouse, children, grandchildren or
parents or to any one or more of them (“Family Member”), (ii) any entity, including but not limited to a corporation, limited liability company, or partnership, a majority of whose ownership interests are owned by Family Members,
(iii) a grantor or testamentary trust of which a Seller’s Shareholder is the settlor, or (iv) by making a charitable gift (that is deductible for federal income or estate tax purposes) of all or any portion of his or her rights under this
Agreement. 
  
 (c) Subject to Section 11.3(a) and (b), neither
Buyer nor Sellers may assign, transfer, or otherwise dispose of directly or indirectly any of their rights hereunder without the prior written consent of the other parties. Any attempted assignment in violation of the foregoing shall be void.

  
 (d) All the terms and provisions of this Agreement shall be
binding upon, shall inure to the benefit of, and shall be enforceable by the respective heirs, successors, permitted assigns, and legal or personal representatives of the parties hereto. 
  

 44 

 11.4 Interpretation. Unless the context of this Agreement clearly requires otherwise, (a)
references to the plural include the singular, the singular the plural, and the part the whole, (b) references to one gender includes all genders, (c) ”or” has the inclusive meaning frequently identified with the phrase “and/or”
and (d) ”including” has the inclusive meaning frequently identified with the phrase “but not limited to.” The section and other headings contained in this Agreement are for reference purposes only and shall not control or affect
the construction of this Agreement or the interpretation thereof in any respect. Section, subsection, schedule, and exhibit references are to this Agreement unless otherwise specified. Each accounting term used herein that is not specifically
defined herein shall have the meaning given to it under GAAP. 
  
 11.5 Notices. All notices that are required or permitted hereunder shall be in writing and shall be sufficient if personally delivered or sent by registered or certified mail, return receipt requested, facsimile message (provided
that a confirmation sheet is emitted from the machine making the transmission), or Federal Express, or other nationally recognized, overnight delivery service. Any notices shall be deemed given upon the earlier of the date when received at, or the
third day after the date when sent by registered or certified mail or the day after the date when sent by Federal Express, or other nationally recognized, overnight delivery service to, the address or fax number set forth below, unless such address
or fax number is changed by notice to the other party hereto given in accordance with the foregoing notice procedures: 
  
 If to Buyer: 
  
 Oglebay Norton Company 
 1100 Superior Avenue

 21st Floor 
 Cleveland, OH
44114-2598 
 FAX: 216-861-3300 
 Attention: Rochelle F. Walk, Esq. 
  
 with required
copies to: 
  
 Thompson Hine & Flory LLP 
 3900 Key Center 
 127 Public Square

 Cleveland, Ohio 44114-1216 
 FAX: 216-566-5800 
 Attention: Paul N. Harris, Esq. 
  

 45 

 If to Sellers, to Sellers’ Representative: 
  
 Michael D. Lundin 
 8230 Greenwood 
 Alpena, Michigan 49707

 FAX: 517-595-3051 
 Attention:
517-595-3051 
  
 with a required copy to: 
  
 Dykema Gossett PLLC 
 1577 North Woodward Avenue, Suite 300 
 Bloomfield Hills, Michigan 48304-2820 
 FAX: 248-203-0763 
 Attention: Donald M. Crawford, Esq. 
  
 11.6 Governing Law. This Agreement shall be construed and interpreted in accordance with the laws of the State of Delaware, without regard to its
provisions concerning conflict of laws. Except as set forth below, each of the parties hereto hereby irrevocably and unconditionally consents to submit to the exclusive jurisdiction of the courts of the State of Delaware and of the United State of
America, in each case located in New Castle County, for any litigation arising out of or relating to this Agreement and the transactions contemplated hereby (and agrees not to commence any litigation relating thereto except in such courts), and
further agrees that service of any process, summons, notice, or document by U.S. registered mail to its respective address set forth in Section 11.5 shall be effective service of process for any litigation brought against it in any court. Except as
set forth below, each of the parties hereto hereby irrevocably and unconditionally waives any objection to the laying of venue of any litigation arising out of this Agreement or the transactions contemplated hereby in the courts of the State of
Delaware or the United States of America, in each case located in New Castle County, and hereby further irrevocably and unconditionally waives and agrees not to plead or claim in any such court that any such litigation brought in any such court had
been brought in an inconvenient forum. 
  
 11.7 Dispute
Resolution. If after the Closing any dispute arises under this Agreement that is not settled promptly in the ordinary course of business, the parties shall seek to resolve any such dispute between them, first, by negotiating promptly with each
other in good faith in face-to-face negotiations in Toledo, Ohio. If the parties are unable to resolve the dispute between them within twenty (20) business days (or such period as the parties shall otherwise agree) through these face-to-face
negotiations, any party may initiate mediation of the controversy or claim in Toledo, Ohio in accordance with the procedures of such mediation organization as the parties may agree. If the dispute has not been resolved pursuant to such mediation
procedure within thirty (30) business days of the initiation of such procedure, or if the parties will not participate in a mediation, any party shall be entitled to seek whatever legal or equitable remedies that may be available to such party,
subject to the terms of Sections 11.6 and 11.7 hereof. Notwithstanding the foregoing, the dispute resolution procedure set forth in this Section 11.7 shall not apply to any dispute between the parties hereto relating to or arising out of
Seller’s Termination Fee or Buyer’s Termination Fee, and in the event of such a dispute, either party shall be entitled to seek whatever legal or equitable remedies that may be available to it. 
  

 46 

 11.8 Counterparts; Facsimile Signatures. This Agreement may be executed in one or more
counterparts, which may be via facsimile signature, each of which shall be binding as of the date first written above, and all of which shall constitute one and the same instrument. Each such copy shall be deemed an original, and it shall not be
necessary in making proof of this Agreement to produce or account for more than one such counterpart. 
  
 [Remainder of page intentionally left blank] 
  

 47 

 IN WITNESS WHEREOF, this Agreement has been executed by the parties hereto on the day and year first
written above. 
  

			
	 OGLEBAY NORTON COMPANY

		
	 By:
	 	 /s/ David H. Kelsey

	 Name:
	 	David H. Kelsey
	 Title:
	 	VP & CFO

  
 JOHNSON MINING INC. 
 THE CARY MINING COMPANY, INC. 
 MICHIGAN MINERALS ASSOCIATES, INC. 

 

			
	 By:
	 	 /s/ Michael D. Lundin

	 	 	Michael D. Lundin, as Sellers’
	 	 	Representative

  
 MICHIGAN LIMESTONE OPERATIONS LIMITED
PARTNERSHIP 
  

			
	 By:
	 	 /s/ Michael D. Lundin

	 	 	Michael D. Lundin, PresidentAmendment No. 1 to Interest Purchase Agreement, dated as of January 31, 2005

 Exhibit 10.8 
 AMENDMENT NO. 1 TO INTEREST PURCHASE AGREEMENT 
  
 This Amendment No. 1 to Interest Purchase Agreement (this “Amendment”), dated as of January 31, 2005, is made by and among Oglebay Norton Company, an Ohio corporation (the “Buyer”), Johnson Mining
Inc., a Delaware corporation, The Cary Mining Company Inc., a Delaware corporation, and Michigan Minerals Associates, Inc., a Delaware corporation (each individually, a “Seller” and collectively, “Sellers”), and Michigan
Limestone Operations, Inc., a Michigan corporation formerly known as “Global Stone Port Inland, Inc.” (the “Company”). 
  
 Background 
  
 A. On April 14, 2000, Oglebay Norton Company, a Delaware corporation (“ONCO”), Sellers, and Michigan Limestone Operations Limited
Partnership (“MLO”) entered into an Interest Purchase Agreement (the “Original Purchase Agreement”) for the sale of all of the general and limited partnership interests in MLO, all of the membership interests in MLO-Ohio Ltd., a
Ohio limited liability company (“MLO-Ohio”), and all of the membership interests of Michigan Equipment Leasing L.L.C., a Michigan limited liability company (“MEL”) and ONCO assigned its rights under the Original Purchase
Agreement to the Company. 
  
 B. Following the consummation
of the transactions contemplated by the Original Purchase Agreement, MLO dissolved, and MLO-Ohio and MEL were merged with and into the Company. Accordingly, the Company became the owner of the business and assets formerly owned by MLO, MLO-Ohio, and
MEL. On May 1, 2001, ONCO was merged into the Buyer, with the Buyer as the surviving corporation. 
  
 C. On February 23, 2004, Buyer and 32 of its affiliates (collectively, the “Debtors”) filed for bankruptcy protection under Chapter 11 of
the U.S. Bankruptcy Code (the “Chapter 11 Cases”) in the United States Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”). The Parties agree that the Original Purchase Agreement constitutes an executory
contract within the meaning of section 365 of the Bankruptcy Code, 11 U.S.C. §§ 101–1330 (the “Bankruptcy Code”). Buyer, Sellers and the Company wish to enter into this Amendment to amend and modify the Contingent Payments
provided for in the Original Purchase Agreement. In connection with the Chapter 11 Cases, the Debtors filed the Second Amended Joint Plan of Reorganization, dated July 30, 2004 (as the same may be amended, modified or supplemented, the
“Plan”), which provides for the assumption and, to the extent necessary, assignment of the Original Purchase Agreement, as amended by this Amendment (the “Purchase Agreement”). On November 17, 2004, the Bankruptcy Court entered
an Order confirming the Plan (the “Confirmation Order”). 
  
 Agreement 
  
 1. Defined Terms.

  
 (a) Except as specifically provided in this Amendment,
capitalized terms not otherwise defined in this Amendment will have the same meanings as in the Original Purchase Agreement. 

 (b) Whenever the defined term “Agreement” is used in the Purchase Agreement, it means
the Original Purchase Agreement, as amended by this Amendment. 
  
 (c) The term “Effective Date” means the Effective Date, as defined in the Plan, and is the effective date of the Plan and of this Amendment. 
  
 2. Effective Date. This Amendment will become effective and legally binding on the Effective Date. 

 
 3. Assumption and Assignment. The Purchase Agreement shall
be assumed by the Buyer and, to the extent necessary, assigned to the reorganized Buyer, pursuant to section 365 of the Bankruptcy Code and Section V.A of the Plan, as of the Effective Date. The Sellers shall not assert or seek to recover any cure
amounts or adequate assurance of future performance within the meaning of section 365 of the Bankruptcy Code, beyond the payments and agreements specifically identified in this Amendment. 
  
 4. Amendment to Section 1.1(c). Section 1.1(c) of the Original Purchase Agreement is amended and restated in
its entirety as follows. 
  
 (c) “Change in Control”
means: 
  
 (i) the sale of the Operations;

  
 (ii) the sale of more than 50% of the capital
stock of any subsidiary of the Buyer that is, directly or indirectly, the owner of one or more of the Operations; 
  
 (iii) the sale of all or substantially all of the assets of the Buyer, or 
  
 (iv) the acquisition of beneficial ownership, directly or indirectly, after the Effective Date, by any
person or any group, of shares representing more than fifty percent (50%) of the aggregate ordinary voting power represented by the outstanding capital stock of Buyer or any successor or assign of Buyer (a “Stock Acquisition”) and either :

  
 (x) a majority of the members of the Board of
Directors of the Buyer or any successor or assign of Buyer are neither (1) persons who were members of the Board of Directors of Buyer as constituted on the Effective Date nor (2) persons nominated or appointed by the Board of Directors of Buyer or
any successor or assign of Buyer (provided that such persons were not nominated or appointed in connection with or in anticipation of the Stock Acquisition); or 
  

(y) any two (2) or more of Michael D. Lundin, Julie A. Boland or Rochelle F. Walk are terminated without cause or are 

 
removed from their respective duties as CEO and President, Vice President, CFO and Treasurer, and Vice President, General Counsel and Secretary or resign
because of diminution of duties or authority or hostile work environment within twelve (12) months of the Stock Acquisition. 
  
 5. Amendment to Section 1.1(g). Section 1.1(g) of the Original Purchase Agreement is amended and restated in its entirety as follows.

  
 “EBITDA” means, with respect to any Person
for any period, the sum of (a) the net income (loss) of for the Buyer and its subsidiaries for such period, determined on a consolidated basis and in accordance with GAAP, but excluding from the determination thereof (without duplication) (i) (A)
any extraordinary or non-recurring non-cash gains or non-cash losses, (B) any extraordinary or non-recurring cash gains in an aggregate amount not to exceed $4,000,000, (C) any extraordinary or non-recurring cash losses in an aggregate amount not to
exceed $2,000,000, or (D) gains or losses from dispositions; (ii) non-cash restructuring charges and cash restructuring charges related to professional and advisory fees in connection with the Chapter 11 Cases, the transactions contemplated by this
Agreement, the Plan and the Confirmation Order relating thereto, and (iii) effects of discontinued operations and (b) without duplication, the sum of the following amounts of the Buyer and its subsidiaries for such period to the extent deducted in
clause (a) above with respect to the Buyer and its subsidiaries for such period: (i) interest expense, (ii) income tax expense, (iii) depreciation expense, (iv) amortization expense, (v) non-cash depletion, (vi) non-cash accretion, (vii) non-cash
expenses arising from the grant of stock options and other management compensation, and (viii) non-cash charges arising solely from the implementation of fresh start accounting by the Buyer and its subsidiaries in connection with their emergence
from the Chapter 11 Cases, in the case of clauses (b)(i) through (b)(viii) above, as determined on a consolidated basis. 
  
 6. Amendment to Section 1.1(m). Section 1.1(m) of the Original Purchase Agreement is amended and restated in its entirety as follows.

  
 “Fundamental Change” means any material change in
the manner in which Sellers operated the MLO Quarries or Buyer operated the Port Inland Quarry prior to the Closing Date that reduces or is reasonably likely to reduce the tonnage shipments from the Operations, excluding synergistic or other changes
necessitated solely by the transaction contemplated by this Agreement or by applicable laws. 
  
 7. Amendment to Section 2.3. Effective for each calendar year beginning after December 31, 2002, Section 2.3 of the Original Purchase Agreement is hereby amended and restated in its entirety as follows.

 (a) 2003 Payment. For the year 2003, Buyer will pay to Sellers $625,000 within ten
(10) business days after the Effective Date. 
  
 (b) Tonnage Payment. For each year during the period 2004-2016 (the “Tonnage Payment Period”), only if the aggregate tonnage of shipments from the Operations for such year exceeds 12,500,000 net tons (“Tonnage
Target”), Buyer will pay to Sellers a tonnage payment (“Tonnage Payment”) as set forth in the table below; provided that Tonnage Payments will be made for no more than eleven of the thirteen years in the Tonnage Payment Period. For
each year during the period 2004-2016 for which a Tonnage Payment is made, and if the aggregate tonnage of shipments from the Operations for such year exceeds 15,000,000 net tons (“Second Tonnage Target”), Buyer will pay to Sellers an
additional tonnage payment as set forth in the table below (“Second Tonnage Payment”), in addition to the Tonnage Payment. In the event of Force Majeure, the time period used to determine whether one or more Tonnage Targets or Second
Tonnage Targets have been met and the years in which Sellers are eligible to receive a Tonnage Payment or Second Tonnage Payment shall be extended in a manner reasonably agreed to by the Parties including consideration of the seasonality of the
business of the Operations. 
  

									
	 Tonnage Measuring Year

	  	Tonnage Payment
Year

	  	Tonnage Payment
12.5 Million Tons

	  	 Second Tonnage
Payment
 15 Million Tons

	 2004
	  	2005	  	$	375,000	  	$	350,000
	 2005
	  	2006	  	$	375,000	  	$	350,000
	 2006
	  	2007	  	$	375,000	  	$	350,000
	 2007
	  	2008	  	$	1,750,000	  	$	600,000
	 2008
	  	2009	  	$	1,750,000	  	$	600,000
	 2009
	  	2010	  	$	1,750,000	  	$	600,000
	 2010
	  	2011	  	$	1,750,000	  	$	600,000
	 2011
	  	2012	  	$	1,750,000	  	$	600,000
	 2012
	  	2013	  	$	1,750,000	  	$	600,000
	 2013
	  	2014	  	$	1,750,000	  	$	600,000
	 2014
	  	2015	  	$	1,750,000	  	$	600,000
	 2015
	  	2016	  	$	1,750,000	  	$	600,000
	 2016
	  	2017	  	$	1,750,000	  	$	600,000

  
 (c)
EBITDA Payment. For any year from 2004 through 2016, if (i) Buyer is required by Section 2.3(b) to make a Tonnage Payment and (ii) Buyer’s EBITDA equals or exceeds the annual EBITDA target amount for that year set forth in the table
below, Buyer will pay to Sellers up to $300,000 in accordance with 

 
this Section. 50% of the EBITDA payment will be paid if Buyer’s EBITDA is equal to or greater than 100% of the EBITDA target amount and an additional
50% of the EBITDA payment will be paid only if Buyer’s EBITDA equals or exceeds 110% of the EBITDA target amount. 
  

						
	 EBITDA Measuring Year

	  	EBITDA Payment
Year

	  	EBITDA Target

	 2004
	  	2005	  	$	61,552,000
	 2005
	  	2006	  	$	60,400,000
	 2006
	  	2007	  	$	64,400,000
	 2007
	  	2008	  	$	68,500,000
	 2008
	  	2009	  	$	72,800,000
	 2009
	  	2010	  	$	74,984,000
	 2010
	  	2011	  	$	77,234,000
	 2011
	  	2012	  	$	79,551,000
	 2012
	  	2013	  	$	81,938,000
	 2013
	  	2014	  	$	84,396,000
	 2014
	  	2015	  	$	86,928,000
	 2105
	  	2016	  	$	89,536,000
	 2016
	  	2017	  	$	92,222,000

  
 (d)
Guaranty. Concurrently with the execution and delivery of this Amendment, Buyer will cause all of its domestic subsidiaries listed on Schedule 2.3(d) to execute and deliver a guaranty agreement (“Guaranty”) in substantially
the form attached to this Amendment as Exhibit A. The Guaranty will become effective on the Effective Date. The execution and delivery of the Guaranty will constitute adequate assurance of future performance of the Purchase Agreement pursuant
to section 365 of the Bankruptcy Code. Buyer will also cause all future domestic subsidiaries to execute and deliver the Guaranty. 
  
 (e) Contingent Payment. Except as provided in Section 2.3(b) with respect to Force Majeure, the measurement periods for the
Contingent Payments will be based upon the fiscal year of the Buyer (January 1 through December 31), beginning with January 1, 2004 of the Buyer’s fiscal year 2004. Buyer will make one annual Contingent Payment as required by Section 2.3(a)-(c)
to Sellers within the earlier of (i) thirty (30) days after the actual filing date of Buyer’s annual report on Form 10-K (“10-K”) or (ii) thirty (30) days after the due date of the 10-K. If no 10-K is required to be filed, the annual
Contingent Payment will be due on April 30th of each year. 

 (f) [Reserved]. 
  
 (g) Change in Control; Sale of Assets 
  
 (i) At any time during the Tonnage Payment Period, if there is a Change in Control, then Buyer will (1)
within ten (10) business days of such Change in Control provide Sellers with written notice of such Change in Control, and (2) at the written election of Sellers, pay to Sellers the Accelerated Payment within thirty (30) days of date of such written
notice of Sellers’ election to demand the Accelerated Payment (as defined below). The term “Accelerated Payment” means (i) an amount equal to the sum of the present values of annual payments of $725,000 for each year remaining during
the period 2004-2006 of the Tonnage Payment Period and (ii) an amount equal to the sum of the present values of annual payments of $2,350,000 for each year remaining during the period 2007-2016 of the Tonnage Payment Period as if such payments were
made in consecutive years starting with the next date on which a Tonnage Payment or Second Tonnage Payment would otherwise come due and calculated using a discount rate equal to the applicable interest rate at the most recent auction of federal ten
year treasury notes prior to the date the Accelerated Payment is due and payable. The Accelerated Payment will be calculated taking into account the fact that Section 2.3(b) provides that Tonnage Payments will be made in not more than eleven of the
thirteen years in the Tonnage Payment Period. 
  
 (ii) If, during the Tonnage Payment Period, (1) Buyer sells all or substantially all of the assets or equity interests relating to one or two of the Port Inland Quarry and the MLO Quarries, or (2) Buyer makes a Fundamental Change, in
Sellers’ reasonable judgment, in the business of the Operations other than a Fundamental Change implemented with the written concurrence of Sellers’ Representative (provided that Sellers’ Representative is knowledgeable regarding the
quarrying, processing, and selling of limestone and is not, directly or indirectly, affiliated with a competitor of Buyer or the Operations, and provided further that Peter Johnson, Jim Rhude, Kent Rhude, and Robert Ross, Sr. will each be deemed by
Buyer to have the requisite degree of knowledge to serve as a Sellers’ Representative) or a change resulting from a Force Majeure, Buyer will (A) within ten (10) business days of the occurrence of such sale or change provide written notice of
such sale or change to Sellers, and (B) at the written election of Sellers, will pay to Sellers an amount equal to the Accelerated Payment multiplied by (X) in the case of an asset or equity interest sale involving either the Port Inland Quarry or
one of the MLO Quarries, the percentage set forth on Schedule 2.3(g) 

 
and, (Y) in the case of a Fundamental Change in the Operations as described above, 100%, within thirty (30) days of Buyer’s receipt of written notice of
Sellers’ election to accept such amount. If an asset or equity interest sale as described in subsection 2.3(g)(ii)(X) occurs for which less than 100% of the Accelerated Payment is paid, then the Tonnage Target and the Second Tonnage Target will
be reduced by the percentage set forth in Schedule 2.3(g) times the Tonnage Target and the Second Tonnage Target previously in effect. 
  
 (iii) If an Event of Default occurs during the Tonnage Payment Period, then Buyer will (1) within ten (10) business days of the occurrence
of such Event of Default provide Sellers with written notice of such Event of Default, and (2) at the written election of Sellers, pay to Sellers the Accelerated Payment within thirty (30) days of the date of the written notice. 
  
 (iv) Acceptance by Sellers of the full amount of the
Accelerated Payment will terminate immediately all of Buyer’s obligations under this Agreement. Acceptance by Sellers of any payment offered by Buyer in an amount less than the amount then due will be deemed an acceptance on account only, and
Sellers’ acceptance of any such partial payment shall not constitute a waiver of Sellers’ right to receive the entire amount due under this Agreement. Upon the occurrence of an event with respect to which Sellers may demand an Accelerated
Payment pursuant to subsection 2.3(g)(i), (ii) or (iii) (an “Acceleration Event”), neither the failure of Sellers to promptly exercise their right to declare the Accelerated Payment to be immediately due and payable, nor the failure of
Sellers to demand strict performance of any other obligation of Buyer (or any successor) set forth in Section 2.3 or 2.4, will constitute a waiver of any such rights, nor a waiver of such rights in connection with any future Acceleration Event. The
election by Sellers not to demand the Accelerated Payment upon the occurrence of an Acceleration Event will not waive the right of Sellers to demand the Accelerated Payment upon the occurrence of any subsequent Acceleration Event. The election by
Sellers to demand the Accelerated Payment with respect to an asset or equity interest sale as described in subsection 2.3(g)(ii)(X) for which less than 100% of the Accelerated Payment is paid will not preclude Sellers from demanding any remaining
amount of such Accelerated Payment upon the occurrence of a subsequent Acceleration Event. 
  
 (v) Notwithstanding any provision in this Agreement to the contrary, upon the occurrence of an Acceleration Event, Sellers must elect in
writing to have Buyer pay the 

 
Accelerated Payment within thirty (30) days of the date of the written notice of the occurrence of the Acceleration Event from Buyer. If Sellers fail to make
such election within such thirty (30) day period, then Sellers will have waived their right to the Accelerated Payment for such Acceleration Event. 
  
 (h) Subordination. 
  
 (i) Each of the Sellers and Buyer acknowledges that the Contingent Payment and the obligations in respect of the Guaranty and all other amounts from time
to time to be paid to the Sellers hereunder or thereunder (including, without limitation, any premium, fees, interest and expenses that accrue or are payable (or that would accrue and be payable but for such case, proceeding or other action) after
the commencement of any case, proceeding or other action relating to the bankruptcy, insolvency or reorganization of the Buyer and/or its subsidiaries (whether or not such fees, interest or expenses are allowed or allowable as a claim in such case,
proceeding or other action), the “Subordinated Debt”) are and shall continue to be unsecured and fully subordinated and junior in all respects to the obligations and indebtedness under the senior secured credit facility in the original
principal amount of $320,000,000 that will be entered into by the reorganized Buyer and certain of its affiliates, the agents and lenders party thereto on the Effective Date (as such facility is amended, restated, waived, supplemented, extended,
modified, increased, replaced or refinanced, with or without notice to Sellers, from time to time, the “Confirmation Facility”). 
  
 (ii) Buyer shall not make, and shall not permit any of its subsidiaries to make, and Sellers shall not demand, accept or receive, any payment in respect
of the Subordinated Debt if either immediately before such payment or immediately after giving effect to such payment, an “Event of Default” under and as defined in the Confirmation Facility shall exist. 
  
 (iii) Unless and until all Confirmation Facility Debt (as defined below) has
been Paid in Full (as defined below), the Sellers shall not join with any creditor in commencing any proceeding under any insolvency, bankruptcy, receivership, liquidation, reorganization or other similar law, unless the collateral agent under the
Confirmation Facility shall also join in bringing such proceeding; provided that, the foregoing shall not prohibit the Sellers from filing a proof of claim in any such proceeding not commenced by the Sellers. 
  
 (iv) In the event of any insolvency proceedings, and any receivership,
liquidation, reorganization or other similar proceedings in connection therewith, relative to the Buyer or any of its subsidiaries or to their creditors, in their capacity as creditors of the Buyer or any of its subsidiaries, or to substantially all
of their property, and in the event of any proceedings for voluntary liquidation, dissolution or other winding up of the Buyer or any of its subsidiaries, whether or not involving insolvency or bankruptcy, then: 
  
 (A) the holders of the Confirmation Facility Debt shall first be Paid in
Full before the Sellers would be entitled to receive any payment on account or in respect of the Subordinated Debt; 

 (B) any payment or distribution of assets of the Buyer or any of its subsidiaries of any kind or
character, whether in cash, property or securities to which the Sellers are entitled under the terms of the Purchase Agreement, but for the provisions of this Section 2.3(h), shall be paid or distributed by the liquidating trustee or agent or other
person making such payment or distribution, whether a trustee in bankruptcy, a receiver or liquidating trustee or other trustee or agent, directly to the administrative agent under the Confirmation Facility to be applied to the Confirmation Facility
Debt in accordance with the terms of the Confirmation Facility to the extent necessary to result in the Confirmation Facility Debt being Paid in Full; 
  
 (v) Should any payment or distribution or security or the proceeds of any thereof be collected or received by the Sellers in respect of the Subordinated
Debt, at a time when the payment thereof by the Buyer or any of its subsidiaries is prohibited by the terms of this Section 2.3(h), the Sellers shall forthwith deliver the same to the administrative agent under the Confirmation Facility in precisely
the form received (except for the endorsement or the assignment of or by the Sellers where necessary) for application to payment of all Confirmation Facility Debt in accordance with the terms of the Confirmation Facility until the Confirmation
Facility Debt is Paid in Full, and, until so delivered, the same shall be held in trust by the Sellers as the property of the holders of the Confirmation Facility Debt. 
  
 (vi) The Sellers agree that, in the event that all or any part of any payment made on account of the Confirmation Facility
Debt is recovered from the holders of Confirmation Facility Debt as a preference, fraudulent transfer or similar payment under any bankruptcy, insolvency or similar law, any payment or distribution received by the Sellers on account of the
Subordinated Debt at any time after the date of the payment so recovered shall be deemed to have been received by the Sellers in trust as the property of the holders of the Confirmation Facility Debt and the Sellers shall forthwith deliver the same
to the administrative agent under the Confirmation Facility to be applied to the Confirmation Facility Debt in accordance with the terms of the Confirmation Facility until the Confirmation Facility Debt is Paid in Full. 
  
 (vii) The Sellers acknowledge and agree that the holders of the Confirmation
Facility Debt have relied upon and shall continue to rely upon the subordination provided for herein in entering into the agreements relating to Confirmation Facility Debt and in extending credit to the Buyer or any of its subsidiaries pursuant
thereto. 
  
 (viii) Any assignment or other transfer by the
Sellers or Buyer or any of it subsidiaries of their rights or obligations under this Agreement or the Guaranty shall be made expressly subject to this Section 2.3(h), and each assignment in contravention of this Section 2.3(h)(viii) shall be null
and void. 

 (ix) The subordination provisions contained herein are solely for the benefit of the holders of the
Confirmation Facility Debt from time to time and, so long as the Confirmation Facility Debt has not been Paid in Full, this Section 2.3(h) may not be rescinded, cancelled, modified or amended in any way without the prior written consent thereto of
the collateral agent and administrative agent under the Confirmation Facility. No other party, including any creditor or equity holder of the Debtors, is entitled to the benefit of the subordination provisions contained in this Section 2.3(h).

 (x) The following terms used in this Section 2.3(h) shall have the respective meanings indicated below:

  
 (A) “Confirmation Facility Debt” “
means (1) all principal of, premium, fees and interest and expenses (including, without limitation, any premium, fees, interest and expenses (“Post-Petition Amounts”) that accrue or are payable (or that would accrue and be payable
but for such case, proceeding or other action) after the commencement of any case, proceeding or other action relating to the bankruptcy, insolvency or reorganization of the Buyer and/or its subsidiaries (whether or not such Post-Petition Amounts
are allowed or allowable as a claim in such case, proceeding or other action)) on any loan under, and all notes issued pursuant to, the Confirmation Facility, (2) any increases, renewals, refinancings or extensions of any of the foregoing (or any
portion thereof) (including Post-Petition Amounts) and (3) all indemnities and all other amounts (including, without limitation, obligations in respect of letters of credit and banking services) payable by the Buyer and/or its subsidiaries
thereunder or with respect thereto, including under any other Loan Document (as defined in the Confirmation Facility). 
  
 (B) “Paid in Full” means the payment in full in cash, in immediately available funds, of all the Confirmation Facility Debt (whether or
not any of the Confirmation Facility Debt shall have been voided, disallowed or subordinated pursuant to any provision of the Federal Bankruptcy Code, any applicable state fraudulent conveyance law, any other law in connection with an insolvency
proceeding or otherwise) after (1) the commitments to extend Confirmation Facility Debt shall have been terminated, (2) all principal of the Confirmation Facility Debt, interest and fees thereon and expenses with respect thereto (including interest
and fees accruing and expenses payable subsequent to the filing of any petition initiating any insolvency proceeding, whether or not a claim for such interest, fees or expenses is allowed in any such proceeding) and all other obligations in respect
of the Confirmation Facility Debt shall have been paid in full in cash, and (3) the administrative agent under the Confirmation Facility shall have received cash collateral in such amounts as such administrative agent determines are reasonably
necessary to secure the agents and lenders under the Confirmation Facility from loss, cost, damage or expense, including attorneys’ fees and expenses, in connection with any contingent obligations in respect of the Confirmation Facility Debt,
including checks or other payments provisionally credited to the Confirmation Facility Debt, as to which such agents and lenders have not yet received final payment, letters of credit and/or banking services obligations. 
  
 Amendment to Section 2.4. Effective for each calendar year
beginning after December 31, 2003, Section 2.4 of the Original Purchase Agreement is hereby amended and restated in its entirety as follows. 

 (a) Tonnage Statement. Within thirty (30) days following the completion of each of the years
referred to in Section 2.3(b), Buyer will prepare and deliver to Seller a statement showing the tonnage of shipments from the Operations for such year (the “Preliminary Tonnage Statement”). Following receipt of the Preliminary Tonnage
Statement, Sellers will be afforded a period of thirty (30) days to review the Preliminary Tonnage Statement (the “Tonnage Review Period”). To assist in any such review, Buyer will make available to Sellers’ Representative within ten
(10) business days of Sellers so requesting, and to any independent accounting firm selected by Sellers (subject to such firm’s prior execution of Buyer’s standard confidentiality agreement attached hereto as Exhibit 2.4(a)(1) and
Buyer’s independent accounting firm’s standard release attached hereto as Exhibit 2.4(a)(2)), whose fees and expenses shall be borne by Sellers, access to the books and records of the Operations solely as they relate to the tonnage
of shipments from the Operations for such year. The Tonnage Review Period will be extended by one day for each day that access to such books and records of the Operations is denied or delayed by Buyer. At or before the end of the Tonnage Review
Period, Sellers’ Representative must either (i) accept the Preliminary Tonnage Statement in its entirety or (ii) deliver to Buyer a written notice setting forth a detailed explanation of those items in the Preliminary Tonnage Statement that
Sellers dispute (a “Notice of Tonnage Dispute”). If Sellers’ Representative does not deliver a Notice of Tonnage Dispute to Buyer within the Tonnage Review Period, Sellers will be deemed to have accepted the Preliminary Tonnage
Statement in its entirety. 
  
 (b) EBITDA Statement. Within
ninety (90) days following the completion of each year referred to in Section 2.3(c), Buyer will prepare and deliver to Sellers a statement showing the annual EBITDA of Buyer (the “Preliminary EBITDA Statement”). Following receipt of the
Preliminary EBITDA Statement, Sellers will be afforded a period of sixty (60) days to review the Preliminary EBITDA Statement (the “EBITDA Review Period”). To assist in any such review, Buyer will make available to Sellers’
Representative within ten (10) days of Sellers so requesting, and to any independent accounting firm selected by Sellers (subject to such firm’s prior execution of Buyer’s standard confidentiality agreement attached hereto at Exhibit
2.4(a)(1) and Buyer’s independent accounting firm’s standard release attached hereto as Exhibit 2.4(a)(2)), whose fees and expenses shall be borne by Sellers, access to any publicly available information regarding the Buyer,
including audit reports. The Review Period shall be extended by one day for each day that access to such information 

 
of Buyer is denied or delayed by Buyer. At or before the end of the EBITDA Review Period, Sellers’ Representative must either (i) accept the Preliminary
EBITDA Statement in its entirety or (ii) deliver to Buyer a written notice setting forth a detailed explanation of those items in the Preliminary EBITDA Statement that Sellers dispute (a “Notice of EBITDA Dispute”). If Sellers’
Representative does not deliver a Notice of EBITDA Dispute to Buyer within the EBITDA Review Period, Sellers will be deemed to have accepted the Preliminary EBITDA Statement in its entirety. 
  
 (c) Resolution of Disputes. Within a period of thirty (30) days after
delivery of a Notice of Tonnage Dispute or a Notice of EBITDA Dispute, Buyer and Sellers will attempt to resolve in good faith any disputed items. If they are unable to do so, any disputed items will be submitted to a mutually agreeable nationally
recognized firm of independent accountants for resolution (the “Independent Public Accountants”). Sellers and Buyer will share equally the cost of the Independent Public Accountants. The determination of the disputed items by the
Independent Public Accountants will be final and binding on the parties and a judgment on the determination of the Independent Public Accountant may be entered by a court of competent jurisdiction. Any other disputes, including those involving a
Fundamental Change, shall be resolved in accordance with Section 11.7 hereof. 
  
 8. Effect on Original Purchase Agreement. Except as specifically modified by this Agreement, the Original Purchase Agreement is ratified and confirmed in all respects; provided, however,
that nothing in this Amendment shall constitute or be deemed to constitute: (a) an assumption or assumption and assignment of the Purchase Agreement unless and until the Effective Date occurs; or (b) a postpetition agreement. 
  
 9. Payment of Expenses. Buyer will pay the Sellers’
reasonable and necessary out-of-pocket expenses (including reasonable and necessary attorneys’ fees) incurred in connection with the negotiation, documentation and execution of this Agreement. Buyer will pay such expenses within ten (10)
business days after receiving a detailed invoice for such expenses from Sellers or, if Buyer disputes any amounts included in the invoice, within ten (10) business days of the resolution of such dispute. 
  
 10. No Change of Control. The Sellers consent to any Change in
Control resulting from the commencement or pendency of the Chapter 11 Cases or Buyer’s emergence from the Chapter 11 Cases and waive any rights they may have (or may have had) to demand an Accelerated Payment based on any Change of Control
resulting from the commencement or pendency of the Chapter 11 Cases or Buyer’s emergence from the Chapter 11 Cases. 
  
 SIGNATURES ON NEXT PAGE 

 The Sellers, the Buyer, and the Company have executed this Amendment as of the Effective Date.

  

									
	OGLEBAY NORTON COMPANY	 	 	 	MICHIGAN LIMESTONE OPERATIONS, INC.
					
	By:	 	 /s/ Julie A. Boland

	 	 	 	By:	 	 /s/ Julie A. Boland

	Name:	 	Julie A. Boland	 	 	 	Name:	 	Julie A. Boland
	Title:	 	Vice President, Chief Financial Officer & Treasurer	 	 	 	Title:	 	Vice President and Treasurer
			
	JOHNSON MINING INC.	 	 	 	THE CARY MINING COMPANY, INC.
					
	By:	 	 /s/ Peter J. Johnson

	 	 	 	By:	 	 /s/ James E. Rhude

	 	 	 Peter J. Johnson

	 	 	 	 	 	 James E. Rhude

	 	 	(Printed name)	 	 	 	 	 	(Printed name)
	 	 	 President

	 	 	 	 	 	 President

	 	 	(Title)	 	 	 	 	 	(Title)
				
	MICHIGAN MINERALS ASSOCIATES, INC.	 	 	 	 	 	 
					
	By:	 	 /s/ Robert R. Ross

	 	 	 	 	 	 
	 	 	 Robert R. Ross

	 	 	 	 	 	 
	 	 	(Printed name)	 	 	 	 	 	 
	 	 	 Authorized Representative

	 	 	 	 	 	 
	 	 	(Title)	 	 	 	 	 	 

  
 SIGNATURE PAGE TO 
 AMENDMENT NO. 1
TO INTEREST PURCHASE AGREEMENT 

 SCHEDULE 2.3(d) 

 EXHIBIT A

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