Document:

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                                                                   EXHIBIT 10.64

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                           INTEREST PURCHASE AGREEMENT

                                  BY AND AMONG

                             OGLEBAY NORTON COMPANY

                                       AND

               JOHNSON MINING INC., THE CARY MINING COMPANY INC.,

                       MICHIGAN MINERALS ASSOCIATES, INC.,

                                       AND

                MICHIGAN LIMESTONE OPERATIONS LIMITED PARTNERSHIP

                              DATED APRIL 14, 2000

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                                   TABLE OF CONTENTS

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ARTICLE I DEFINITIONS ..........................................................        1
       1.1    Definitions ......................................................        1

ARTICLE II PURCHASE AND SALE OF INTERESTS ......................................        5
       2.1    Purchase and Sale ................................................        5
       2.2    Total Consideration ..............................................        6
       2.3    Contingent Payments ..............................................        6
       2.4    Procedures relating to Contingent Payments .......................        9
       2.5    Closing ..........................................................       10
       2.6    Default By Any of Sellers ........................................       10
       2.7    Allocation of Purchase Price .....................................       10

ARTICLE III REPRESENTATIONS AND WARRANTIES OF SELLERS ..........................       10
       3.1    Authorization ....................................................       10
       3.2    Organization, Good Standing and Qualification ....................       11
       3.3    No Violation .....................................................       11
       3.4    Capitalization ...................................................       12
       3.5    Notices ..........................................................       12
       3.6    Subsidiaries .....................................................       12
       3.7    Affiliates .......................................................       12
       3.8    Financial Statements .............................................       13
       3.9    Real Property Matters ............................................       13
       3.10   Title to Properties; Encumbrances ................................       13
       3.11   Real Property Owned or Leased ....................................       13
       3.12   Equipment and Other Personal Property Leases .....................       14
       3.13   Intellectual Property ............................................       14
       3.14   Contracts ........................................................       14
       3.15   Employee Benefit Plans ...........................................       14
       3.16   Certain Environmental Matters ....................................       17
       3.17   Absence of Certain Changes .......................................       17
       3.18   Litigation .......................................................       18
       3.19   Labor Matters ....................................................       18
       3.20   Insurance ........................................................       18
       3.21   Consents and Approvals ...........................................       19
       3.22   Broker's and Finder's Fees .......................................       19
       3.23   Major Customers and Suppliers ....................................       19
       3.24   Taxes ............................................................       19
       3.25   Compliance with Laws .............................................       21

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF BUYER .............................       21
       4.1    Authorization ....................................................       21
       4.2    Organization, Good Standing and Qualification ....................       21
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       4.3    No Violation .....................................................      21
       4.4    Financial Statements .............................................      22
       4.5    Real Property Matters ............................................      22
       4.6    Title to Properties; Encumbrances ................................      22
       4.7    Real Property Owned or Leased ....................................      22
       4.8    Equipment and Other Personal Property Leases .....................      23
       4.9    Contracts ........................................................      23
       4.10   Certain Environmental Matters ....................................      23
       4.11   Absence of Certain Changes .......................................      25
       4.12   Litigation .......................................................      25
       4.13   Labor Matters ....................................................      25
       4.14   Insurance ........................................................      25
       4.15   Consents and Approvals ...........................................      26
       4.16   Broker's and Finder's Fees .......................................      26
       4 17   Major Customers and Suppliers ....................................      26
       4.18   Taxes ............................................................      26
       4.19   Compliance with Laws .............................................      27
       4.20   Employee Benefit Plans ...........................................      27
       4.21   Company Information ..............................................      28

ARTICLE V CONDUCT OF BUSINESS PRIOR TO THE CLOSING .............................      28
       5.1    Conduct of Business of the Company ...............................      28

ARTICLE VI ADDITIONAL AGREEMENTS AND COVENANTS .................................      30
       6.1    Access to Properties and Records; Confidentiality ................      30
       6.2    Transfer of Interests ............................................      31
       6.3    Reasonable Efforts ...............................................      31
       6.4    Material Events ..................................................      31
       6.5    Fees and Expenses ................................................      31
       6.6    Further Assurances ...............................................      32
       6.7    Public Announcements .............................................      32
       6.8    Property Taxes ...................................................      32
       6.9    Transfer Taxes ...................................................      32
       6.10   Michigan Single Business Taxes ...................................      32
       6.11   FIRPTA Certificates ..............................................      33
       6.12   Cooperation and Exchange of Information ..........................      33
       6.13   Litigation Support ...............................................      33
       6.14   Formation of Limited Liability Company ...........................      34
       6.15   Sellers' Representative ..........................................      34
       6.16   Intentionally omitted ............................................      34
       6.17   Shareholder Loans ................................................      34
       6.18   Employee Benefits Matters ........................................      35

ARTICLE VII CONDITIONS TO THE OBLIGATIONS OF BUYER .............................      36
       7.1    Representations and Warranties True ..............................      36
       7.2    Performance ......................................................      36
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       7.3    Absence of Litigation ............................................       37
       7.4    Consents and Approvals ...........................................       37
       7.5    Intentionally omitted ............................................       37
       7.6    Intentionally omitted ............................................       37
       7.7    Noncompetition Agreements ........................................       37
       7.8    Supporting Documents .............................................       37
       7.9    Other Documents ..................................................       37

ARTICLE VIII CONDITIONS TO THE OBLIGATIONS OF SELLERS ..........................       38
       8.1    Representations and Warranties True ..............................       38
       8.2    Performance ......................................................       38
       8.3    Absence of Litigation ............................................       38
       8.4    Consents .........................................................       38
       8.5    Supporting Documents .............................................       38
       8.6    Other Documents ..................................................       39

ARTICLE IX TERMINATION .........................................................       39
       9.1    Termination ......................................................       39
       9.2    Effect of Termination ............................................       40

ARTICLE X INDEMNIFICATION ......................................................       40
       10.1   Indemnification by Sellers .......................................       40
       10.2   Indemnification by Buyer .........................................       40
       10.3   Procedure ........................................................       40
       10.4   Maximum Liability; Deductible ....................................       42
       10.5   Survival .........................................................       43
       10.6   Exclusive Remedy .................................................       43
       10.7   Limitation .......................................................       43

ARTICLE XI MISCELLANEOUS PROVISIONS ............................................       43
       11.1   Contents of Agreement ............................................       43
       11.2   Amendment, Waiver; Parties in Interest, Etc ......................       43
       11.3   Assignment .......................................................       44
       11.4   Interpretation ...................................................       45
       11.5   Notices ..........................................................       45
       11.6   Governing Law ....................................................       46
       11.7   Dispute Resolution ...............................................       46
       11.8   Counterparts; Facsimile Signatures ...............................       47
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SCHEDULES

Schedule 1.1(p)(1)    -       Individuals with Actual Knowledge (Seller)
Schedule 1.1(p)(2)    -       Individuals with Actual Knowledge (Buyer)
Schedule 2.2(a)       -       Wire Transfer Instructions
Schedule 2.3(b)       -       EBITDA Target Amounts
Schedule 2.3(g)       -       Accelerated Payment Amount Percentages

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Schedule 2.7(a)        -       The Allocation
Schedule 3.2           -       Organization, Good Standing and Qualification
Schedule 3.4           -       Capitalization
Schedule 3.5           -       Notices
Schedule 3.7           -       Affiliates
Schedule 3.10          -       Title to Properties; Encumbrances
Schedule 3.11          -       Real Property Owned or Leased
Schedule 3.12          -       Equipment and Other Personal Property Leases
Schedule 3.14          -       Contracts
Schedule 3.15          -       Employee Benefit Plans
Schedule 3.16          -       Certain Environmental Matters
Schedule 3.17          -       Absence of Certain Changes
Schedule 3.18          -       Litigation
Schedule 3.19          -       Labor Matters
Schedule 3.20          -       Insurance
Schedule 3.21          -       Consents and Approvals
Schedule 3.23          -       Major Customers and Suppliers
Schedule 3.24          -       Taxes
Schedule 4.5           -       Real Property Matters
Schedule 4.6           -       Title to Property; Encumbrances
Schedule 4.7           -       Real Property Owned or Leased
Schedule 4.8           -       Equipment and Other Personal Property Leases
Schedule 4.9           -       Contracts
Schedule 4.10          -       Certain Environmental Matters
Schedule 4.11          -       Absence of Certain Changes
Schedule 4.13          -       Labor Matters
Schedule 4.14          -       Insurance
Schedule 4.15          -       Consents
Schedule 4.17          -       Major Customers and Suppliers
Schedule 4.21          -       Company Information
Schedule 6.14          -       Formation of Limited Liability Company
Schedule 6.17(a)       -       Shareholder Notes
Schedule 6.17(b)       -       Shareholder Indebtedness
Schedule 7.7(a)        -       Parties Executing Noncompetition Agreement

EXHIBITS

Exhibit 1.1(y)         -       Sellers' Representative Agreement
Exhibit 2.3(a)         -       Example of Tonnage Payment
Exhibit 2.3(b)         -       Examples of EBITDA Payment
Exhibit 2.3(c)         -       Example EBITDA Target Amounts and Capital
                               Expenditure Amount
Exhibit 2.4(a)(1)      -       Buyer's Standard Confidentiality Agreement
Exhibit 2.4(a)(2)      -       Buyer's Accountants' Standard Release
Exhibit 7.7(b)         -       Form of Noncompetition Agreement

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                           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 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

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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 nonrecurring (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 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

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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. Section 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.

      (v) "Person" shall mean any natural person, corporation, partnership,
limited liability company, proprietorship, association, trust, business
organization, government, governmental agency, or any legal entity.

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      (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 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

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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 each be deemed by Buyer to
      have the requisite degree of knowledge to serve as a Sellers'

                                        7

<PAGE>

      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.

                                        8

<PAGE>

      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.

      (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

                                        9

<PAGE>

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.

                                   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

                                       10

<PAGE>

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

<PAGE>

      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

<PAGE>

      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

                                       13

<PAGE>

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.

      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

<PAGE>

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

<PAGE>

      (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)(l), 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

<PAGE>

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

<PAGE>

      (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

<PAGE>

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

<PAGE>

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

<PAGE>

      (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

                                       21

<PAGE>

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.

      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

<PAGE>

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

<PAGE>

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.

                                       24

<PAGE>

      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

<PAGE>

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

<PAGE>

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

<PAGE>

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

<PAGE>

      (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

<PAGE>

      (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

<PAGE>

      (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

<PAGE>

      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

<PAGE>

      (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

<PAGE>

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

<PAGE>

      (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

<PAGE>

      (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

                                       36

<PAGE>

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.

      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

<PAGE>
                                  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

<PAGE>

      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

<PAGE>

            (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

<PAGE>

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

<PAGE>

      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

<PAGE>

      (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

<PAGE>

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

<PAGE>

      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

<PAGE>

      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

                                       46

<PAGE>

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.

      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

<PAGE>

      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, President

                                        1Ex-10.1

 

Exhibit 10.1

JLG INDUSTRIES, INC.

RESTATED ANNUAL MANAGEMENT INCENTIVE PLAN

Section 1. Purpose

     The purpose of the JLG Industries, Inc. Restated Annual Management
Incentive Plan (the “Plan”) is to provide annual incentive awards in order to
motivate certain executive officers and key employees of JLG Industries, Inc.,
a Pennsylvania corporation, and its Subsidiaries to put forth maximum efforts
toward the growth, profitability and success of the Company and its
Subsidiaries and to encourage such individuals to remain in the employ of the
Company or a Subsidiary.

Section 2. Definitions

     In this Plan document, unless the context clearly indicates otherwise,
words in the masculine gender shall be deemed to include a reference to the
female gender, any term used in the singular also shall refer to the plural,
and the following terms, when capitalized, shall have the meaning set forth in
this Section 2:

     (a) “Award” means a potential cash benefit payable or cash benefit paid to
a person in accordance with the terms and conditions of the Plan.

     (b) “Beneficiary” means the person or persons designated in writing by the
Grantee as his beneficiary in respect of an Award; or, in the absence of an
effective designation or if the designated person or persons predecease the
Grantee, the Grantee’s Beneficiary shall be the person or persons who acquire
by bequest or inheritance the Grantee’s rights in respect of an Award. In
order to be effective, a Grantee’s designation of a Beneficiary must be on file
with the Company before the Grantee’s death. Any such designation may be
revoked and a new designation substituted therefor at any time before the
Grantee’s death.

     (c) “Board of Directors” or “Board” means the Board of Directors of the
Company.

     (d) “Change in Control” means the first to occur of the following events:

(1) an acquisition (other than directly from the Company) of
securities of the Company by any person, immediately after
which such person, together with all securities law
affiliates and associates of such person, becomes the
beneficial owner of securities of the Company representing 25
percent or more of the voting power; provided that, in
determining whether a Change in Control has occurred, the
acquisition of securities of the Company in a non-control
acquisition will not constitute an acquisition that would
cause a Change in Control; or

 

 

(2) three or more directors, whose election or nomination for
election is not approved by a majority of the members of the
incumbent Board then serving as members of the Board of
Directors, are elected within any single 12-month period to
serve on the Board of Directors; provided that an individual
whose election or nomination for election is approved as a
result of either an actual or threatened election contest or
proxy contest, including by reason of any agreement intended
to avoid or settle any election contest or proxy contest,
will be deemed not to have been approved by a majority of the
incumbent Board for purposes of this definition; or

(3) members of the incumbent Board cease for any reason to
constitute at least a majority of the Board of Directors; or

(4) approval by shareholders of the Company of:

(i) a merger, consolidation, or reorganization
involving the Company, unless

(A) the shareholders of the Company, immediately
before the merger, consolidation, or
reorganization, own, directly or indirectly
immediately following such merger, consolidation,
or reorganization, at least 75 percent of the
combined voting power of the outstanding voting
securities of the corporation resulting from such
merger, consolidation or reorganization in
substantially the same proportion as their
ownership of the voting securities immediately
before such merger, consolidation, or
reorganization;

(B) individuals who were members of the incumbent
Board immediately prior to the execution of the
agreement providing for such merger,
consolidation, or reorganization constitute at
least a majority of the board of directors of the
surviving corporation; and

(C) no person (other than (I) the Company or any
Subsidiary thereof, (II) any employee benefit
plan (or any trust forming a part thereof)
maintained by the Company, any Subsidiary
thereof, or the surviving corporation, or (III)
any person who, immediately prior to such merger,
consolidation, or reorganization, had beneficial
ownership of securities representing 25 percent
or more of the voting power) has beneficial
ownership of securities representing 25 percent
or more of the combined voting power of the
surviving corporation’s then outstanding voting
securities;

-2-

 

(ii) a complete liquidation or dissolution of the
Company; or

(iii) an agreement for the sale or other disposition of
all or substantially all of the assets of the Company
to any person (other than a transfer to a Subsidiary).

     (e) “Code” means the Internal Revenue Code of 1986, as amended from time
to time.

     (f) “Committee” means a committee appointed by the Board for the purpose
of administering the Plan. The Committee shall consist of two or more members
of the Compensation Committee of the Board, each of whom shall qualify, at the
time of appointment and thereafter, as an “outside director” within the meaning
of Section 162(m) of the Code (or a successor provision of similar import), as
in effect from time to time.

     (g) “Company” means JLG Industries, Inc.

     (h) “Covered Executive” means an individual who is determined by the
Committee to be reasonably likely to be a “covered employee” under Section
162(m) of the Code as of the end of the Company’s taxable year for which an
Award to the individual will be deductible and whose Award would exceed the
deductibility limits under Section 162(m) if such Award is not
Performance-Based Compensation.

     (i) “Disability” or “Disabled” means having a total and permanent
disability as defined in Section 22(e)(3) of the Code.

     (j) “Grantee” means an executive officer or key employee of the Company or
a Subsidiary to whom an Award has been granted under the Plan.

     (k) “Performance Objective” means the goal or goals identified by the
Committee that will result in an Award if the target for the Performance Year
is satisfied.

     (l) “Performance Year” means the fiscal year beginning August 1 and ending
July 31.

     (m) “Performance-Based Compensation” means compensation that is intended
to qualify as “performance-based compensation” under Section 162(m) of the Code
and the regulations thereunder.

     (n) “Plan” means the JLG Industries, Inc. Restated Annual Management
Incentive Plan, as set forth herein and as amended from time to time.

     (o) “Retirement” means retirement pursuant to the JLG Industries, Inc.
Employees’ Retirement Savings Plan, as amended from time to time.

     (p) “Subsidiary” means a corporation, association, partnership, limited
liability company, joint venture, business trust, organization, or business of
which the Company directly or indirectly through one or more intermediaries
owns at least 50% of the outstanding

-3-

 

capital stock (or other shares of beneficial interest) entitled to vote
generally in the election of directors or other managers of the entity.

Section 3. Administration

     (a) The Plan shall be administered by the Committee. The Committee shall
have all the powers vested in it by the terms of the Plan, such powers to
include authority (within the limitations described herein) to select the
persons to be granted Awards under the Plan, to determine the time when Awards
will be granted, to determine whether performance objectives and other
conditions for earning Awards have been met, to determine whether Awards will
be paid at the end of the Performance Year or deferred to a later date, and to
determine whether an Award or payment of an Award should be reduced or
eliminated. The Committee is authorized, subject to the remaining provisions
of the Plan, to establish such rules and regulations as it deems necessary for
the proper administration of the Plan and to make such determinations and
interpretations and to take such action in connection with the Plan and any
Awards granted hereunder as it deems necessary or advisable. All
determinations and interpretations made by the Committee shall be binding and
conclusive on all persons participating in the Plan and their legal
representatives.

     (b) The Committee may not delegate to any individual the authority to make
determinations concerning that individual’s own Awards, or the Awards of any
Covered Executive. Except as provided in the preceding sentence, the Committee
may delegate to one or more of its members, or to one or more executive
officers of the Company, including the Chief Executive Officer, authority (i)
to select key employees to receive Awards under the Plan, and (ii) to make all
other determinations in respect of such Awards. In addition, the Committee may
delegate to such persons such administrative duties as it deems advisable.
References herein to the Committee shall include any delegate described under
this paragraph, except where the context or the regulations under Code Section
162(m) otherwise require.

     (c) The Committee, or any person to whom it has delegated duties as
described herein, may employ one or more persons to render advice with respect
to any responsibility the Committee or such person may have under the Plan
(including such legal or other counsel, consultants, and agents as it may deem
desirable for the administration of the Plan) and may rely upon any opinion or
computation received from any such counsel, consultant, or agent. Expenses
incurred in the engagement of such counsel, consultant, or agent shall be paid
by the Company.

Section 4. Eligibility

     The Committee may grant Awards under the Plan to such executive officers
and key employees of the Company as it shall select for participation pursuant
to Section 3 above.

Section 5. Awards; Limitations on Awards

     (a) Each Award granted under the Plan shall represent an amount payable in
cash by the Company to the Grantee upon achievement of one or more or a
combination of Performance Objectives in a Performance Year, subject to all
other terms and conditions of the Plan and to such other terms and conditions
as may be specified by the Committee. The grant of

-4-

 

Awards under the Plan to Covered Executives shall be evidenced by Award
letters in a form approved by the Committee from time to time which shall
contain the terms and conditions, as determined by the Committee, of a
Grantee’s Award; provided, however, that in the event of any conflict between
the provisions of the Plan and any Award letters, the provisions of the Plan
shall prevail. An Award shall be determined by multiplying the Grantee’s
target percentage of base salary with respect to a Performance Year by
applicable factors and percentages based on the achievement of Performance
Objectives, subject to the discretion of the Committee provided in Section 6
hereof.

     (b) The maximum amount of an Award granted to any one Grantee in respect
of a Performance Year shall not exceed $3.5 million. This maximum amount
limitation shall be measured at the time of settlement of an Award under
Section 7.

     (c) Annual Performance Objectives shall be based on the performance of the
Company, one or more of its Subsidiaries or affiliates, one or more of its
units or divisions and/or the individual for the Performance Year. The
Committee shall use one or more of the following business criteria to establish
Performance Objectives for Grantees who are Covered Executives: increase in net
sales; pretax income before allocation of corporate overhead and bonus; budget;
earnings per share; net income; attainment of division, group or corporate
financial goals; return on stockholders’ equity; return on assets; attainment
of strategic and operational initiatives; appreciation in or maintenance of the
price of the common stock or any other publicly-traded securities of the
Company; increase in market share; gross profits; earnings before interest and
taxes; earnings before interest, taxes, depreciation and amortization; economic
value-added models; comparisons with various stock market indices; or
reductions in costs. The Performance Objective for any Covered Executive shall
be sufficiently specific that a third party having knowledge of the relevant
facts could determine whether the objective is met; and the outcome under the
Performance Objective shall be substantially uncertain when the Committee
establishes the objective. In the case of a Grantee who is not a Covered
Executive, the Committee may establish Performance Objectives using the
criteria listed above in this Section 5(c), or the Committee may use any other
measure of performance that it shall approve in its discretion.

Section 6. Grant Of Awards

     (a) The Committee shall grant Awards to any Grantees who are Covered
Executives not later than 90 days after the commencement of the Performance
Year. If a Covered Executive is initially employed by the Company or a
Subsidiary after the beginning of a Performance Year, the Committee may grant
an Award to that Covered Executive with respect to a period of service
following the Covered Executive’s date of hire, provided that no more than 25%
of the relevant service period has elapsed when the Committee grants the Award
and the Performance Objective otherwise satisfies the requirements applicable
to Covered Executives. The Committee shall select Grantees other than Covered
Executives for participation in the Plan and shall grant Awards to such
Grantees at such times as the Committee may determine. In granting an Award,
the Committee shall establish the terms of the Award, including the Performance
Objective and the maximum amount that will be paid (subject to the limit in
Section 5) if the Performance Objective is achieved. The Committee may
establish different

-5-

 

payment levels under an Award based on different levels of achievement
under the Performance Objective.

     (b) After the end of each Performance Year, the Committee shall determine
the amount payable to each Grantee in settlement of the Grantee’s Award for the
Performance Year. The Committee, in its discretion, may reduce the maximum
payment established when the Award was granted, or may determine to make no
payment under the Award. The Committee, in its discretion, may increase the
amount payable under the Award (but not to an amount greater than the limit in
Section 5) to a Grantee who is not a Covered Executive. The Committee shall
certify in writing, in a manner conforming to applicable regulations under
Section 162(m) of the Code, prior to the settlement of each Award granted to a
Covered Executive, that the Performance Objectives and other material terms of
the Award upon which settlement of the Award was conditioned have been
satisfied.

     (c) The Committee may adjust or modify Awards or terms of Awards (1) in
recognition of unusual or nonrecurring events affecting the Company or any
business unit, or the financial statements or results thereof, or in response
to changes in applicable laws (including tax, disclosure, and other laws),
regulations, accounting principles, or other circumstances deemed relevant by
the Committee, (2) with respect to any Grantee whose position or duties with
the Company change during a Performance Year, or (3) with respect to any person
who first becomes a Grantee after the first day of the Performance Year;
provided, however, that no adjustment to an Award granted to a Covered
Executive shall be authorized or made if, and to the extent that, such
authorization or the making of such adjustment would contravene the
requirements applicable to Performance-Based Compensation.

Section 7. Settlement Of Awards

     (a) Except as provided in this Section 7, each Grantee shall receive
payment of a cash lump sum in settlement of his or her Award, in the amount
determined in accordance with Section 6, as promptly as practicable following
the time such determination in respect thereof has been reached by the
Committee. No Award to a Covered Executive for a Performance Year commencing
after July 31, 2005, shall be settled until the shareholders of the Company
have approved the Plan in a manner that satisfies the requirements of Section
162(m) of the Code.

     (b) Each Grantee shall have the right to defer his or her receipt of part
or all of any payment due in settlement of an Award under and in accordance
with the terms and conditions of any deferred compensation plan or arrangement
of the Company unless otherwise specified by the Committee.

Section 8. Termination Of Employment

     Except as otherwise provided in any written agreement between the Company
and a Grantee, if a Grantee ceases to be employed by the Company prior to the
end of a Performance Year for any reason other than death, Disability, or
Retirement, any Award for such Performance Year shall be forfeited. If such
cessation of employment results from such Grantee’s death, Disability, or
Retirement, the Committee shall determine, in its sole discretion and in such

-6-

 

manner as it may deem reasonable, subject to Section 9, the extent to
which the Performance Objectives for the Performance Year or portion thereof
completed at the date of cessation of employment have been achieved, and the
amount payable in settlement of the Award based on such determinations. The
Committee may base such determination on the performance achieved for the full
year, in which case its determination may be deferred until following the
Performance Year. Such determinations shall be set forth in a written
certification, as specified in Section 6. Such Grantee or his or her
beneficiary shall be entitled to receive settlement of such Award at the
earliest time such payment may be made without causing the payment to fail to
be deductible by the Company under Section 162(m) of the Code.

Section 9. Status Of Awards Under Section 162(m)

     It is the intent of the Company that Awards granted to Covered Executives
for Performance Years commencing after July 31, 2005, shall constitute
Performance-Based Compensation, if at the time of settlement the Grantee
remains a Covered Executive. Accordingly, the Plan shall be interpreted in a
manner consistent with Section 162(m) of the Code and the regulations
thereunder. If any provision of the Plan relating to a Covered Executive or
any Award letter evidencing such an Award to a Covered Executive does not
comply with, or is inconsistent with, the provisions of Section 162(m)(4)(C) of
the Code or the regulations thereunder (including Treasury Regulation §
1.162-27(e)) for Performance-Based Compensation, such provision shall be
construed or deemed amended to the extent necessary to conform to such
requirements.

Section 10. Transferability

     Awards and any other benefit payable under, or interest in, this Plan are
not transferable by a Grantee except upon a Grantee’s death by will or the laws
of descent and distribution, and shall not be subject in any manner to
anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, or
charge, and any such attempted action shall be void.

Section 11. Withholding

     All payments relating to an Award, whether at settlement or resulting from
any further deferral or issuance of an Award under another plan of the Company
in settlement of the Award, shall be net of any amounts required to be withheld
pursuant to applicable federal, state and local tax withholding requirements.

Section 12. Tenure

     A Grantee’s right, if any, to continue to serve the Company as a Covered
Executive, officer, employee, or otherwise, shall not be enlarged or otherwise
affected by his or her designation as a Grantee or any other event under the
Plan.

Section 13. No Rights To Participation or Settlement

     Nothing in the Plan shall be deemed to give any eligible employee any
right to participate in the Plan except upon determination of the Committee.
Until the Committee has determined to settle an Award under Section 7, a
Grantee’s selection to participate, the grant of

-7-

 

an Award, and other events under the Plan shall not be construed as a
commitment that any Award will be settled under the Plan. The foregoing
notwithstanding, the Committee may authorize legal commitments with respect to
Awards under the terms of an employment agreement or other agreement with a
Grantee, to the extent of the Committee’s authority under the Plan, including
commitments that limit the Committee’s future discretion under the Plan, but in
all cases subject to Section 9.

Section 14. Unfunded Plan

     Grantees shall have no right, title, or interest whatsoever in or to any
specific assets of the Company, or to any investments that the Company may make
to aid in meeting its obligations under the Plan. Nothing contained in the
Plan, and no action taken pursuant to its provisions, shall create or be
construed to create a trust of any kind, or a fiduciary relationship between
the Company and any Grantee, beneficiary, legal representative or any other
person. To the extent that any person acquires a right to receive payments
from the Company under the Plan, such right shall be no greater than the right
of an unsecured general creditor of the Company. All payments to be made
hereunder shall be paid from the general funds of the Company. The Company
shall not be required to establish any special or separate fund, or to
segregate any assets, to assure payment of such amounts. The Plan is not
intended to be subject to the Employee Retirement Income Security Act of 1974,
as amended.

Section 15. Other Compensatory Plans And Arrangements

     Nothing in the Plan shall preclude any Grantee from participation in any
other compensation or benefit plan of the Company or its Subsidiaries. The
adoption of the Plan and the grant of Awards hereunder shall not preclude the
Company or any Subsidiary from paying any other compensation apart from the
Plan, including compensation for services or in respect of performance in a
Performance Year for which an Award has been made. If an Award to a Covered
Executive may not be settled under the terms of the Plan, however (for example,
because the Covered Executive has not achieved the Performance Objective or
because shareholders have not approved the Plan), neither the Company nor a
Subsidiary may pay any part of the Award to the Covered Executive outside the
Plan.

Section 16. Duration, Amendment And Termination Of Plan

     No Award may be granted in respect of any Performance Year commencing
after July 31, 2010. The Board may amend the Plan from time to time (either
retroactively or prospectively), and may suspend or terminate the Plan at any
time, provided that any such action shall be subject to shareholder approval if
and to the extent required to ensure that compensation under the Plan will
qualify as Performance-Based Compensation, or as otherwise may be required
under applicable law.

Section 17. Governing Law

     The Plan, Awards granted hereunder, and actions taken in connection
herewith shall be governed and construed in accordance with the laws of the
Commonwealth of Pennsylvania (regardless of the law that might otherwise govern
under applicable Pennsylvania principles of conflict of laws).

-8-

 

Section 18. Effective Date

     The Plan shall be effective as of August 1, 2004; provided, however, that
Awards granted for Performance Years commencing after July 31, 2005, shall be
subject to approval of the shareholders of the Company at an annual meeting or
any special meeting of stockholders of the Company before settlement of Awards
for the 2006 Performance Year ending on July 31, 2006, so that compensation
will qualify as Performance-Based Compensation. Awards for the Performance
Year ending July 31, 2005, are not intended to qualify as Performance Based
Compensation and therefore are not subject to shareholder approval. In
addition, the Board may determine to submit the Plan to shareholders for
reapproval at such time, if any, required in order that compensation under the
Plan shall qualify as Performance-Based Compensation.

-9-

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