OGLEBAY NORTON CO
8-K, 1998-06-05
WATER TRANSPORTATION
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<PAGE>   1
                                                       DRAFT NO. 2; JUNE 2, 1998
                                                       -------------------------



                        SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


         Date of report (Date of earliest event reported): May 22, 1998
                                                           ------------


                             OGLEBAY NORTON COMPANY
               (Exact Name of Registrant as Specified in Charter)



Delaware                                 0-663                       34-0158970
- --------                                 -----                       ----------
(State or Other Jurisdiction          (Commission              (I.R.S. Employer
of Incorporation)                      File No.)            Identification No.)
                                               

1100 Superior Avenue - 20th Floor, Cleveland, Ohio                   44114-2598
- --------------------------------------------------                   ----------
(Address of Principal Executive Offices)                            (Zip Code)


        Registrant's telephone number, including area code: 216-861-3300
                                                            -------------

                                       N/A
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)


<PAGE>   2


ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS.

         In accordance with the terms of a Pre-Acquisition Agreement dated April
15, 1998, between the Registrant and Global Stone Corporation ("Global Stone"),
Oglebay Norton Acquisition Company Limited, an indirect wholly-owned subsidiary
of the Registrant organized under the laws of Canada ("ONACL"), commenced a
tender offer on April 24, 1998 to purchase all of the outstanding common shares
of Global Stone (including common shares issuable upon exercise of stock
options) and related rights held by its shareholders for Cdn. $7.80 cash per
share. The Cdn. $7.80 per share price in ONACL's tender offer was determined
through arms-length negotiations between Global Stone and the Registrant. At the
close of business on May 15, 1998, the expiration date for the tender offer,
98.6 percent of the outstanding shares of Global Stone were tendered by the
shareholders of Global Stone in response to ONACL's tender offer. The tendered
shares were taken up and paid for by ONACL on May 22, 1998 ("Acquisition Date").
On the Acquisition Date, ONACL acquired the remaining Global Stone shares
pursuant to the compulsory acquisition procedures contained in Section 206 of
the Canada Business Corporations Act, and Global Stone thereby became a
wholly-owned, subsidiary of the Registrant. 

         The total amount of consideration paid for the stock of Global Stone on
the Acquisition Date was $172,480,000, in cash. Funds for the consideration were
obtained from two sources: a) $74,730,000 was borrowed under a new $215,000,000
revolving credit facility with KeyBank National Association; and, b)
$97,750,000 in net proceeds from a $100,000,000 private placement of senior
subordinated indebtedness with CIBC Oppenheimer Corp.

         There are no material relationships between the shareholders of Global
Stone and the Registrant or any of the Registrant's affiliates, any director or
officer of the Registrant, or any associate of any such director or officer.

         Information related to Global Stone is included in a May 22, 1998
press release issued by the Registrant, filed herewith as Exhibit 99.1. 


                                       2
<PAGE>   3

ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

                  (a)   List of Financial Statements of Businesses Acquired. The
                        Financial Statements will be filed by amendment
                        not later than 60 days from the date this Report is
                        filed with the Commission.
                  (b)   Pro Forma Financial Information. The Pro Forma
                        Financial Information will be filed by amendment not
                        later than 60 days from the date of this Report is filed
                        with the Commission.


                  (c)   Exhibits.

                          10.1    Pre-Acquisition            File herewith as 
                                  Agreement entered          Exhibit 10.1
                                  into between
                                  Registrant and 
                                  Global Stone, dated 
                                  April 15, 1998

                          99.1    May 22, 1998 Press         Filed herewith as 
                                  Release                    Exhibit 99.1




                                       3
<PAGE>   4
                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                 OGLEBAY NORTON COMPANY



Date:  June 5, 1998             By: /s/ David H. Kelsey 
                                    -----------------------------
                                       David H. Kelsey
                                       Vice President - Chief
                                               Financial Officer




                                    4

<PAGE>   1
                                                                    Exhibit 10.1

THE PRE-ACQUISITION AGREEMENT entered into this 15th day of April, 1998.

B E T W E E N:

                  OGLEBAY NORTON COMPANY, a corporation existing under the laws
                  of the State of Delaware,

                  (hereinafter called the "Acquiror")


                                     - and -


                  GLOBAL STONE CORPORATION, a corporation existing under the
                  laws of Canada,

                  (hereinafter called the "Company")



                                    RECITALS

WHEREAS:

1. There is an outstanding take-over bid to the shareholders of the Company
offering to purchase all of the outstanding common shares of the Company at a
price of $6.45 per common share;

2. The board of directors of the Company wishes to encourage the Acquiror to
make a take-over bid to the shareholders of the Company offering to purchase all
of the outstanding common shares of the Company at a price of $7.80 per common
share in cash (the "Offer Price");

3. The board of directors of the Company has determined that it would be in the
best interests of the Company and its shareholders to recommend acceptance of
the Acquiror's offer to the shareholders of the Company, to cooperate with the
Acquiror and take all reasonable action to support the Acquiror's offer and to
waive the application of the Company's Shareholder Rights Plan to the Acquiror's
offer;

4. The board of directors of the Company has determined that it would be in the
best interests of the Company and its shareholders to enter into this Agreement;
and

5. The Acquiror will make an offer subject to the terms and conditions of this
Agreement.

                  NOW THEREFORE IN CONSIDERATION of the mutual covenants
hereinafter set out, the parties hereto hereby agree as follows:



<PAGE>   2
                                      -2-



                                    ARTICLE I
                                    THE OFFER

I.1 THE OFFER. Subject to the terms and conditions of this Agreement, the
Acquiror agrees to mail as soon as practicable but in any event no later than
April 27, 1998 to the holders of common shares of the Company, an offer to
purchase all of the common shares (including the associated rights issued
pursuant to the Company's Shareholder Rights Plan, hereinafter called the
"Rights" and together with the common shares called the "Shares" and the holders
of Shares are hereinafter called "Shareholders") at the Offer Price, subject to
the terms and conditions set out in Schedule "A" to this Agreement as the same
may be amended pursuant to the terms hereof (the "Offer"). The Acquiror further
agrees that it will not amend the terms of the Offer other than to increase the
consideration payable thereunder, to extend the expiry thereof or to waive any
conditions thereof, except with the prior consent of the Company.

I.2 COMPANY APPROVAL OF THE OFFER. The Company represents that its board of
directors, upon consultation with its advisors, has determined unanimously that:

         (a)      the Offer is fair to the Shareholders and is in the best
                  interests of the Company and the Shareholders;

         (b)      the board of directors will recommend that Shareholders accept
                  the Offer; and

         (c)      this Agreement is in the best interests of the Company and the
                  Shareholders.

I.3 COMPANY COOPERATION. The Company covenants to cooperate with the Acquiror,
to take all reasonable action to support the Offer and to provide the Acquiror
with a draft copy of any Directors' Circular to be issued, from time to time,
prior to the mailing thereof, on a confidential basis, and to provide the
Acquiror with a reasonable opportunity to review and provide comments thereon.
The Company further covenants to use reasonable commercial efforts to mail the
Directors' Circular to be issued in connection with the mailing of the Offer on
the same date that the Acquiror mails the Offer to the Shareholders. The
Acquiror covenants to cooperate with the Company and to provide the Company with
a draft copy of the Offer and any take-over bid circular to be issued in respect
of the Offer, prior to the mailing thereof, on a confidential basis, and to
provide the Company with a reasonable opportunity to review and provide comments
thereon.

I.4 JOINT PRESS RELEASE AND PUBLIC DISCLOSURE. The parties agree to jointly
issue a press release as soon as practicable in a mutually agreeable form.

I.5 POST OFFER COVENANTS. If the Acquiror takes up and pays for Shares pursuant
to the Offer, the Acquiror and the Company agree to use all reasonable efforts
to enable the Acquiror to acquire the balance of the Shares as soon as
practicable after 

<PAGE>   3
                                      -3-


completion of the Offer by way of compulsory acquisition, arrangement,
amalgamation or other type of acquisition transaction carried out for a
consideration per Share of not less than the Offer Price. The Company agrees and
represents that its board of directors has determined unanimously to use its and
their respective reasonable efforts to enable the Acquiror to elect or appoint
all of the directors of the Company as soon as possible after the Acquiror takes
up and pays for in excess of 50% of the Shares pursuant to the Offer.

I.6               SHAREHOLDER RIGHTS PLAN.

         (a)      The Company represents that its board of directors has
                  resolved to waive the application of the Shareholder Rights
                  Plan to: (i) the Offer, (ii) any other actions taken by the
                  Acquiror in furtherance of acquiring all of the Shares, and
                  (iii) any other "Triggering Event" as required under the
                  Shareholder Rights Plan; and the Company covenants to take all
                  action necessary pursuant to the Shareholder Rights Plan to
                  effect such waiver, such waiver to become effective on the
                  date (the "Waiver Date") that is the earlier of June 14, 1998
                  or the expiry date of the Offer, as set forth on Schedule "A"
                  hereto, as it may be extended from time to time pursuant to
                  the terms of the Offer.

         (b)      The Company covenants and agrees and represents that, except
                  as provided in Section 1.6(a) above, its board of directors
                  has resolved not to waive the application of the Shareholder
                  Rights Plan or to redeem any of the outstanding Rights or take
                  any other action which would limit the application of the
                  Shareholder Rights Plan to any transaction other than an
                  Acquisition Proposal (as defined in section ERROR! REFERENCE
                  SOURCE NOT FOUND.).

I.7 OUTSTANDING STOCK OPTIONS. The Company agrees and represents that its board
of directors has unanimously resolved to use its and their respective reasonable
efforts to encourage all persons holding options to purchase Shares pursuant to
the Company's employee stock option plan and other compensation arrangements or
otherwise, to exercise their options prior to the expiry of the Offer and to
tender all Shares issued in connection therewith to the Offer. The Company
further agrees and represents that the board of directors of the Company has
also resolved and has authorized and directed the Company to, cause the vesting
of option entitlements under its employee stock option plans and other
compensation arrangements to accelerate prior to the expiry of the Offer, such
that all outstanding Options to acquire Shares become exercisable prior to and
expire concurrently with the expiry of the Offer, and to arrange for all Shares
that are fully paid thereunder to be distributed to those persons entitled
thereto so as to be able to be tendered into the Offer and to thereafter satisfy
all other obligations of the Company under such plans or, upon the acquisition
by the Acquiror of Shares pursuant to the Offer, to cause all entitlements under
such arrangements to terminate upon the payment of an amount in respect of each
outstanding option equal to the difference between the exercise price thereof
and the Offer price.

<PAGE>   4
                                      -4-


                                   ARTICLE II
                            COVENANTS OF THE COMPANY

II.1 ORDINARY COURSE OF BUSINESS. The Company covenants and agrees that, prior
to the time (the "Effective Time") of the appointment or election to the board
of directors of the Company of persons designated by the Acquiror pursuant to
Section ERROR! REFERENCE SOURCE NOT FOUND., unless the Acquiror shall otherwise
agree in writing or as otherwise expressly contemplated or permitted by this
Agreement:

         (a)      the Company shall, and shall cause each of its direct and
                  indirect subsidiaries (collectively its "Subsidiaries") to,
                  conduct its and their respective business only in and not take
                  any action except in, the usual, ordinary and regular course
                  of business and consistent with past practice;

         (b)      the Company shall not directly or indirectly do or permit to
                  occur any of the following, whether directly or indirectly:

                  (i)      issue, sell, pledge, lease, dispose of, grant any
                           interest in, encumber or agree to issue, sell,
                           pledge, lease, dispose of, grant any interest in or
                           encumber (or permit any of its Subsidiaries to issue,
                           sell, pledge, lease, dispose of, grant any interest
                           in, encumber or agree to issue, sell, pledge, lease,
                           dispose of, grant any interest in or encumber):

                           (A)      any additional shares of, or any options,
                                    warrants, calls, conversion privileges or
                                    rights of any kind to acquire any shares of,
                                    any capital stock of the Company or any of
                                    its Subsidiaries (other than pursuant to the
                                    exercise of employee stock options currently
                                    outstanding), or

                           (B)      any assets of the Company or any of its
                                    Subsidiaries (except for sales of inventory
                                    in the ordinary course of business and sales
                                    and other dispositions of equipment and
                                    other personal property not required in
                                    running the current business operations of
                                    the Company and having an aggregate
                                    acquisition cost not in excess of $500,000);

                  (ii)     amend or propose to amend its articles or by-laws or
                           those of any of its Subsidiaries;

                  (iii)    split, combine or reclassify any outstanding Shares,
                           or declare, set aside or pay any dividend (other than
                           as disclosed in writing to the Acquiror prior to the
                           date hereof) or other distribution payable in cash,
                           stock, property or otherwise with respect to the
                           Shares;

                  (iv)     redeem, purchase or offer to purchase (or permit any
                           of its Subsidiaries to redeem, purchase or offer to
                           purchase) any Shares 

<PAGE>   5
                                      -5-


                           or other securities of the Company or any of its
                           Subsidiaries;

                  (v)      reorganize, amalgamate or merge the Company or any of
                           its Subsidiaries with any other person, corporation,
                           partnership or other business organization
                           whatsoever;

                  (vi)     except for the potential acquisition disclosed to the
                           Acquiror under the code name "Watergate", acquire or
                           agree to acquire (by merger, amalgamation,
                           acquisition of stock or assets or otherwise) any
                           person, corporation, partnership or other business
                           organization or division or acquire or agree to
                           acquire any material assets; or

                  (vii)    incur or commit to incur any indebtedness for
                           borrowed money or issue any debt securities except
                           for the borrowing of working capital in the ordinary
                           course of business and consistent with past practice
                           and except borrowings or guarantees necessary to
                           facilitate the financing of the exercise of options
                           pursuant to Section 1.7

         (c)      the Company shall not, and shall cause each of its
                  Subsidiaries to not (otherwise than as may be contemplated in
                  Section ERROR! REFERENCE SOURCE NOT FOUND. of this Agreement):

                  (i)      enter into or modify any employment, severance,
                           collective bargaining or similar agreements, policies
                           or arrangements with, or grant any bonuses, salary
                           increases, severance or termination pay to, any
                           officers or directors of the Company other than
                           pursuant to agreements in effect (without amendment)
                           on the date hereof; or

                  (ii)     in the case of employees who are not officers or
                           directors, take any action other than in the
                           ordinary, regular and usual course of business and
                           consistent with past practice (none of which actions
                           shall be unreasonable or unusual) with respect to the
                           entering into or modifying of any employment,
                           severance, collective bargaining or similar
                           agreements, policies or arrangements or with respect
                           to the grant of any bonuses, salary increases, stock
                           options, pension benefits, retirement allowances,
                           deferred compensation, severance or termination pay
                           or any other form of compensation or profit sharing
                           or with respect to any increase of benefits payable
                           otherwise than pursuant to agreements, policies or
                           arrangements in effect (without amendment) on the
                           date hereof;

<PAGE>   6
                                      -6-


         (d)      the Company shall use its reasonable efforts to cause its
                  current insurance (or re-insurance) policies not to be
                  cancelled or terminated or any of the coverage thereunder to
                  lapse, unless simultaneously with such termination,
                  cancellation or lapse, replacement policies underwritten by
                  insurance and re-insurance companies of nationally recognized
                  standing providing coverage equal to or greater than the
                  coverage under the cancelled, terminated or lapsed policies
                  for substantially similar premiums are in full force and
                  effect;

         (e)      the Company shall:

                  (i)      use its reasonable efforts, and cause each of its
                           Subsidiaries to use its reasonable efforts, to
                           preserve intact their respective business operations,
                           business organizations and goodwill, to keep
                           available the services of its officers and employees
                           as a group and to maintain satisfactory relationships
                           with suppliers, agents, distributors, customers and
                           others having business relationships with it or its
                           Subsidiaries;

                 (ii)      not take any action, or permit any of its
                           Subsidiaries to take any action, that would render,
                           or that reasonably may be expected to render, any
                           representation or warranty made by it in this
                           Agreement untrue in any material respect at any time
                           prior to the Effective Time if then made; and

                (iii)      promptly notify the Acquiror orally and in writing of
                           any material adverse change in the normal course of
                           its or any of its material Subsidiaries' businesses
                           or in the operation of its or any of its material
                           Subsidiaries' properties, and of any material
                           governmental or third party complaints, orders,
                           investigations or hearings (or communications
                           indicating that the same may be contemplated);

         (f)      the Company shall not settle or compromise any claim brought
                  by any current, future, former or purported holder of any
                  securities of the Company in connection with the transactions
                  contemplated by this Agreement or the Offer prior to the
                  Effective Time without the prior written consent of the
                  Acquiror; and

         (g)      the Company shall not enter into or modify any contract,
                  agreement, commitment or arrangement with respect to any of
                  the matters set forth in this Section ERROR! REFERENCE SOURCE
                  NOT FOUND. without the prior consent of the Acquiror.

<PAGE>   7
                                      -7-


II.2              NON-SOLICITATION.

         (a)      The Company shall not, directly or indirectly, through any
                  officer, director, employee, representative or agent of the
                  Company or any of its Subsidiaries, solicit or encourage
                  (including by way of furnishing information or entering into
                  any form of agreement, arrangement or understanding) the
                  initiation of any inquiries or proposals regarding any merger,
                  amalgamation, reorganization, recapitalization, take-over bid,
                  sale of substantial assets, sale of treasury shares or similar
                  transactions involving the Company or any Subsidiaries of the
                  Company (any of the foregoing inquiries or proposals being
                  referred to herein as an "Acquisition Proposal"), provided
                  nothing contained in this SECTION ERROR! REFERENCE SOURCE NOT
                  FOUND. or any other provision of this Agreement shall prevent
                  the board of directors of the Company from considering,
                  negotiating, approving and recommending to the Shareholders an
                  unsolicited bona fide written Acquisition Proposal for which
                  adequate financial arrangements have been made, which the
                  board of directors of the Company determines in good faith
                  (after consultation with its financial advisors, and after
                  receiving a written opinion of outside counsel, or advice of
                  outside counsel that is reflected in the minutes of the board
                  of directors of the Company, to the effect that the board of
                  directors is required to do so in order to discharge properly
                  its fiduciary duties) would, if consummated in accordance with
                  its terms, result in a transaction more favourable to the
                  Shareholders than the transaction contemplated by this
                  Agreement (any such Acquisition Proposal being referred to
                  herein as a "Superior Proposal").

         (b)      The Company shall immediately cease and cause to be terminated
                  any existing discussions or negotiations with any parties
                  (other than the Acquiror) with respect to any potential
                  Acquisition Proposal. The Company agrees not to release any
                  third party from any confidentiality agreement to which the
                  Company and such third party is a party or to waive any of the
                  provisions of such agreements provided, however, that the
                  Company may waive the standstill provisions contained in
                  confidentiality agreements entered into before the date
                  hereof. The Company shall immediately request the return or
                  destruction of all information provided to any third parties
                  who have entered into a confidentiality agreement with the
                  Company relating to a potential Acquisition Proposal and shall
                  use all reasonable efforts to ensure that such requests are
                  honoured.

         (c)      The Company shall immediately notify the Acquiror of any
                  existing Acquisition Proposals or of any future Acquisition
                  Proposal or any request for non-public information relating to
                  the Company or any of its Subsidiaries in connection with an
                  Acquisition Proposal or for access to the properties, books or
                  records of the Company or any Subsidiary by any person or
                  entity that informs any member of the board of directors of
                  the Company or such Subsidiary that it is considering making,
                  or has made, 

<PAGE>   8
                                      -8-


                  an Acquisition Proposal. Such notice to the Acquiror shall be
                  made, from time to time, orally and confirmed in writing and
                  shall indicate such details of the proposal, inquiry or
                  contact known to such person as the Acquiror may reasonably
                  request including the identity of the person making such
                  proposal, inquiry or contact.

         (d)      If the board of directors of the Company receives a request
                  for material non-public information from a party who proposes
                  to the Company a bona fide Acquisition Proposal and the board
                  of directors of the Company determines that such proposal is a
                  Superior Proposal pursuant to Section ERROR! REFERENCE SOURCE
                  NOT FOUND., then, and only in such case, the Company may,
                  subject to the prior execution and delivery of a
                  confidentiality agreement in substantially the same form and
                  containing the same restrictions and limitations as are set
                  forth in the confidentiality agreement then in effect between
                  the Company and the Acquiror, provide such party with access
                  to information regarding the Company; provided that, in
                  respect of any Acquisition Proposal currently outstanding, no
                  such term need be imposed that would be inconsistent with, or
                  would render the party unable to make, the unamended
                  Acquisition Proposal or to complete the unamended Acquisition
                  Proposal pursuant to the terms thereof. The Company agrees to
                  send a copy of any such confidentiality agreement to the
                  Acquiror immediately upon its execution.

         (e)      The Company shall ensure that the officers, directors and
                  employees of the Company and its Subsidiaries and any
                  investment bankers or other advisors or representatives
                  retained by the Company are aware of the provisions of this
                  section, and the Company shall be responsible for any breach
                  of this Section ERROR! REFERENCE SOURCE NOT FOUND. by such
                  bankers, advisors or representatives.

II.3 ACCESS TO INFORMATION. Subject to the existing Confidentiality Agreement
between the Company and the Acquiror dated March 18, 1998 (the "Confidentiality
Agreement"), upon reasonable notice, the Company shall (and shall cause each of
its Subsidiaries to) afford the Acquiror's officers, employees, counsel,
accountants and other authorized representatives and advisors
("Representatives") reasonable access, during normal business hours from the
date hereof and until the expiration of this Agreement, to its properties,
books, contracts and records as well as to its management personnel, and, during
such period, the Company shall (and shall cause each of its Subsidiaries to)
furnish promptly to the Acquiror all information concerning its business,
properties and personnel as the Acquiror may reasonably request. For greater
certainty, the Company hereby waives the standstill provisions in section 9 of
the Confidentiality Agreement.


<PAGE>   9
                                      -9-


                                   ARTICLE III
                           FEES AND OTHER ARRANGEMENTS

III.1             PAYMENT OF FEE.

         (a) If at any time after the execution of this Agreement:

                    (i)    the board of directors has withdrawn, redefined or
                           changed, during the term of the Offer, any of its
                           recommendations, resolutions or determinations
                           referred to in Sections ERROR! REFERENCE SOURCE NOT
                           FOUND., ERROR! REFERENCE SOURCE NOT FOUND., 1.6 or
                           ERROR! REFERENCE SOURCE NOT FOUND. in a manner
                           adverse to the Acquiror or shall have resolved to do
                           so;

                    (ii)   any third party acquires by any means whatsoever
                           during the term of the Offer Shares so as to own in
                           excess of 50% of the Shares; or

                    (iii)  the Company breaches in any material respect any of
                           its representations, warranties or covenants made in
                           this Agreement, including, without limitation, the
                           representations and covenants in Section ERROR!
                           REFERENCE SOURCE NOT FOUND.;

         (each of the above being a "Full Fee Event"), then the Company
                       shall pay to the Acquiror $8,000,000, in immediately
                       available funds to an account designated by the Acquiror,
                       such amount to be due and payable within one business day
                       after the first to occur of the Full Fee Events described
                       above.

         (b)      If following the execution of this Agreement,

                    (i)    an Acquisition Proposal is made to the Shareholders
                           or to the Company, or the currently outstanding
                           Acquisition Proposal is amended to increase the
                           consideration offered thereunder and upon the expiry
                           of the Offer the Minimum Condition (as defined in
                           Schedule "A" to this Agreement) of the Offer has not
                           been satisfied; and

                    (ii)   a Full Fee Event (as defined in Section 3.1(a)) has
                           not occurred

                  then the Company shall pay to the Acquiror $4,000,000, in
                  immediately available funds to an account designated by the
                  Acquiror, such amount to be due and payable within one
                  business day after the occurrence of the event (a "Half Fee
                  Event") described in clause (b)(i) above. Full Fee Events and
                  the Half Fee Event being hereinafter referred to as Fee
                  Events.

<PAGE>   10
                                      -10-



                                   ARTICLE IV
                            COVENANTS OF THE ACQUIROR

IV.1 EMPLOYMENT AGREEMENTS. The Acquiror covenants and agrees, and after the
Effective Time will cause the Company and any successor to the Company to agree,
to honour and comply with the terms of those existing employment and severance
agreements and policies of the Company which the Company has disclosed to the
Acquiror prior to the date hereof.

IV.2 OFFICERS' AND DIRECTORS' INSURANCE. The Acquiror agrees to use reasonable
efforts to secure directors' and officers' insurance coverage for the Company's
current and former directors and officers on a seven year "trailing" (or
"run-off") basis on terms and conditions no less advantageous to the directors
and officers of the Company than those contained in the policy in effect on the
date hereof. If a trailing policy is not available at a reasonable cost (a
"reasonable cost" being not greater than the estimated cost of providing the
coverage referred to in this and the next sentence), then the Acquiror agrees
that for the entire period from the Effective Time until three years after the
Effective Time, the Acquiror will cause the Company or any successor to the
Company to maintain the Company's current directors' and officers' insurance
policy or an equivalent policy, subject in either case to terms and conditions
no less advantageous to the directors and officers of the Company than those
contained in the policy in effect on the date hereof, for all current and former
directors and officers of the Company, covering claims made prior to or within
three years after the Effective Time.


                                    ARTICLE V
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

V.1 REPRESENTATIONS. The Company hereby provides to the Acquiror those
representations and warranties as set forth in Schedule "B" to this Agreement
(and acknowledges that the Acquiror is relying upon those representations and
warranties in connection with entering into this Agreement).

V.2 INVESTIGATION. Any investigation by the Acquiror and its advisors shall not
mitigate, diminish or affect the representations and warranties of the Company
provided pursuant to this Agreement.


                                   ARTICLE VI
                 REPRESENTATIONS AND WARRANTIES OF THE ACQUIROR

VI.1 REPRESENTATIONS. The Acquiror hereby represents and warrants to the Company
as provided in Schedule "C" to this Agreement (and acknowledges that the Company
is relying upon such representations and warranties in connection with the
entering into of this Agreement).

<PAGE>   11
                                      -11-


                                   ARTICLE VII
                                MUTUAL COVENANTS

VII.1 CONSULTATION. The Acquiror and the Company agree to consult with each
other in issuing any press releases or otherwise making public statements with
respect to the Offer or any other Acquisition Proposal and in making any filings
with any federal, provincial or state governmental or regulatory agency or with
any securities exchange with respect thereto. Each party shall use its
reasonable efforts to enable the other party to review and comment on all such
press releases prior to release thereof.

VII.2 FURTHER ASSURANCE. Subject to the terms and conditions herein, the
Acquiror and the Company agree to use their respective reasonable efforts to
take, or cause to be taken, all action and to do, or cause to be done, all
things necessary, proper or advisable under applicable laws and regulations, to
consummate the transactions contemplated by this Agreement and the Offer. The
Company and the Acquiror will, and will cause each of their respective
Subsidiaries to, use their reasonable efforts (i) to obtain all necessary
waivers, consents and approvals from other parties to material loan agreements,
leases and other contracts or agreements (including, in particular but without
limitation, the agreement of any persons as may be required pursuant to any
agreement, arrangement or understanding relating to the Company's or to its
Subsidiaries' operations), (ii) to obtain all necessary consents, approvals and
authorizations as are required to be obtained under any federal, provincial,
state or foreign law or regulations with respect to this Agreement or the Offer,
(iii) to lift or rescind any injunction or restraining order or other order
adversely affecting the ability of the parties to consummate the transactions
contemplated hereby or by the Offer, and (iv) to fulfil all conditions and
satisfy all provisions of this Agreement and the Offer. For greater certainty,
the Company and the Acquiror agree that an order of a regulatory authority
having jurisdiction which cease trades the Rights issued pursuant to the
Company's Shareholder Rights Plan does not in and of itself constitute a breach
of this Agreement or relieve either party of its obligations hereunder.


                                  ARTICLE VIII
                                   TERMINATION

VIII.1            TERMINATION.  This Agreement may be terminated prior to the 
Effective Time:

         (a)      by mutual written consent of the Acquiror and the Company;

         (b)      by the Company after June 30, 1998 if the Acquiror has not
                  become legally obligated to accept and take-up any Shares
                  pursuant to the Offer by such date;

         (c)      by either the Acquiror or the Company, if the Minimum
                  Condition or any other condition of the Offer has not been
                  satisfied or waived on the expiry of the Offer, as the same
                  may be extended from time to time by the 

<PAGE>   12
                                      -12-


                  Acquiror pursuant to the terms of the Offer;

         (d)      by the Acquiror at any time following the occurrence of a Fee
                  Event as provided in Section 3.1; or

         (e)      by the Company, if the Acquiror does not mail the Offer as
                  provided in Section ERROR! REFERENCE SOURCE NOT FOUND.,
                  provided that no Fee Event has occurred;

                  except that the obligations set forth in Section ERROR!
                  REFERENCE SOURCE NOT FOUND. shall survive the termination of
                  this Agreement, other than in respect of a termination
                  pursuant to Section 0 above.

VIII.2 WITHDRAWAL OF OFFER. If this Agreement is terminated as provided in
Section ERROR! REFERENCE SOURCE NOT FOUND. above, the Acquiror may terminate or
withdraw the Offer without any liability or further obligation on its part under
this Agreement.


                                   ARTICLE IX
                                  MISCELLANEOUS

IX.1 AMENDMENT OR WAIVER. This Agreement may be amended, modified or superseded,
and any of the terms, covenants, representations, warranties or conditions
hereof may be waived, but only by written instrument executed by the Acquiror
and the Company; provided, however, that either the Acquiror or the Company may
in its discretion waive a condition herein which is solely for its benefit
without the consent of the other. No waiver of any nature, in any one or more
instances, shall be deemed or construed as a further or continued waiver of any
condition or any breach of any other term, representation or warranty in this
Agreement.

IX.2 ENTIRE AGREEMENT. This Agreement and the documents referred to herein
constitute the entire agreement between the parties with respect to the subject
matter hereof and supersede all prior agreements, arrangements or understandings
with respect thereto.

IX.3 HEADINGS. The descriptive headings are for convenience of reference only
and shall not control or affect the meaning or construction of any provisions of
this Agreement.

IX.4 NOTICES. All notices or other communications which are required or
permitted hereunder shall be communicated confidentially and in writing and
shall be sufficient if delivered personally, or sent by confidential telecopier
addressed as follows:

<PAGE>   13
                                      -13-


          To the Acquiror:

          c/o Oglebay Norton Company
          1100 Superior Avenue, 20th Floor
          Cleveland, OH 44114-2598

          Attention: Mr. Jeffrey S. Gray
                     Vice President - Corporate Development and Legal Affairs

          Facsimile: (216) 861-2314

          With a Copy to:

          Stikeman, Elliott
          Suite 5300
          Commerce Court West
          Toronto, Ontario
          M5L 1B9
          Attention: Mr. John M. Stransman
                     Mr. Robert W.A. Nicholls

          Facsimile: (416) 947-0866

          To the Company:

          251 North Service Road West
          Suite 306
          Oakville, Ontario
          L6M 3E7

          Attention: Mr. Robert Stone

          Facsimile: (604) 608-6163

          With a Copy to:

          McCarthy, Tetrault
          55 King Street West
          TD Bank Tower
          TD Centre, 49th Floor
          Toronto, Ontario
          M5K 1E6

          Attention: Mr. David Armstrong
                     Mr. Graham Gow

          Facsimile: (416) 868-1891

<PAGE>   14
                                      -14-


IX.5 COUNTERPARTS. This Agreement may be executed in any number of counterparts
and each such counterpart shall be deemed to be an original instrument but all
such counterparts together shall constitute but one Agreement.

IX.6 EXPENSES. Each party will pay its own expenses. The Acquiror and the
Company represent and warrant to each other that, except for CIBC Wood Gundy
Securities Inc. in the case of the Company, no broker, finder or investment
banker is entitled to any brokerage, finder's or other fee or commission, or to
the reimbursement of any of its expenses, in connection with the Offer. The
Company has provided to the Acquiror a correct and complete copy of all
agreements between the Company and each of its financial advisors as are in
existence at the date hereof. The Company covenants not to amend the terms of
any such agreements relating to the payment of fees and expenses without the
prior written approval of the Acquiror.

IX.7 ASSIGNMENT. The Acquiror may assign all or any part of its rights or
obligations under this Agreement to a direct or indirect Subsidiary of the
Acquiror, but, if such assignment takes place, the Acquiror shall continue to be
liable to the Company for any default in performance by the assignee. This
Agreement shall not otherwise be assignable by either party without the prior
written consent of the other party.

IX.8 SEVERABILITY. If any term, provision, covenant or restriction of this
Agreement is held by a court of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be effected, impaired or invalidated and the parties shall negotiate
in good faith to modify the Agreement to preserve each party's anticipated
benefits under the Agreement.

IX.9 CURRENCY. All references to dollars or "$" in this Agreement refer to
Canadian dollars.

IX.10 CHOICE OF LAW. This Agreement shall be governed by, construed and
interpreted in accordance with the laws of the Province of Ontario.


                  IN WITNESS WHEREOF the parties hereto have caused this
Agreement to be executed on their behalf by their officers thereunto duly
authorized as of the date first written above.


                                       OGLEBAY NORTON COMPANY



                                       By: /s/ John N. Lauer
                                           ----------------------------------
                                           Name:  John N. Lauer
                                           Title:  President and C.E.O.





<PAGE>   15
                                      -15-

                                       GLOBAL STONE CORPORATION



                                       By: /s/ Robert R. Stone
                                           ----------------------------------
                                           Name:  Robert R. Stone
                                           Title:  Chairman



<PAGE>   16





                                  SCHEDULE "A"

                               TERMS OF THE OFFER


1.       GENERAL TERMS. The Offer shall be made by a circular bid prepared in
         compliance with the Securities Act (Ontario) and other applicable
         provincial securities laws and in accordance with the
         Multi-Jurisdictional Disclosure System to United States Shareholders.

2.       EXPIRY DATE. The Offer shall be open until midnight on the 21st day
         following the mailing thereof (provided that the Acquiror may extend
         such period of time in its sole discretion).

3.       OFFER PRICE. The Offer shall be made in cash at a price of not less
         than $7.80 per Share (including Shares which may become outstanding on
         the exercise of options, warrants or other rights to purchase Shares
         (other than rights issued pursuant to the Shareholder Rights Plan)).

4.       The Offer shall not be subject to any conditions other than those
         substantially described as follows:

         (a)      at the expiry time there shall have been validly deposited
                  under the Offer and not withdrawn a number of Shares which
                  constitutes at least 66 2/3% of the outstanding Shares
                  (calculated on a fully diluted basis) (the "Minimum
                  Condition");

         (b)      the Acquiror shall have determined, acting reasonably, that no
                  material right, property, franchise or license of the Company
                  or any of its Subsidiaries has been or may be impaired (which
                  impairment has not been cured or waived) or otherwise
                  adversely affected as a result of the making of the Offer or
                  the taking up and paying for Shares deposited under the Offer
                  including, for greater certainty, through the triggering of
                  any third party's right (including subject to the provision of
                  notice, the lapse of time, or both) to acquire any material
                  asset of the Corporation or any of its Subsidiaries;

         (c)      all requisite governmental, stock exchange or regulatory
                  approvals, consents and exemptions with respect to the Offer
                  or any other transaction contemplated by the Offer shall have
                  been obtained on terms satisfactory to the Acquiror acting
                  reasonably including without limitation:

                  (i)      all approvals or exemptions required under the
                           Investment Canada Act shall have been obtained on
                           terms satisfactory to the Acquiror acting reasonably;

                  (ii)     no proceedings shall have been taken or threatened
                           under the merger provisions of Part VIII or under
                           Part VI of the Competition Act (Canada) in respect of
                           the transaction which may result from 





<PAGE>   17
                                      -2-




                           the Offer; and

                  (iii)    any applicable waiting periods under the
                           Hart-Scott-Rodino Antitrust Improvements Act of 1976
                           shall have expired or been earlier terminated;

         (d)      no act, action, suit or proceeding shall have been threatened
                  or taken before or by any Canadian or United States federal,
                  provincial, state or foreign court or other tribunal or
                  governmental agency or other regulatory or administrative
                  agency or commission or by any elected or appointed public
                  official or private person (including without limitation any
                  individual, corporation, firm, group or other entity) in
                  Canada, the United States or elsewhere, whether or not having
                  the force of law, and no law, regulation or policy shall have
                  been proposed, enacted, promulgated or applied, whether or not
                  having the force of law, which could reasonably be expected to
                  have the effect of:

                  (i)      making illegal, or otherwise directly or indirectly
                           restraining or prohibiting or making materially more
                           costly, the making of the Offer, the acceptance for
                           payment of, payment for, or ownership, directly or
                           indirectly, of some or all of the Shares by the
                           Acquiror, the completion of a compulsory acquisition
                           or any subsequent acquisition transaction or the
                           consummation of any of the transactions contemplated
                           by the Offer;

                  (ii)     prohibiting or materially limiting the ownership or
                           operation by the Company or any of its Subsidiaries,
                           or by the Acquiror (or the parent of the Acquiror),
                           directly or indirectly, of all or any material
                           portion of the business or assets of the Company, on
                           a consolidated basis, or the Acquiror (or the parent
                           of the Acquiror), directly or indirectly, or
                           compelling the Acquiror (or the parent of the
                           Acquiror), directly or indirectly, to dispose of or
                           hold separate all or any material portion of the
                           business or assets of the Company, on a consolidated
                           basis, or the Acquiror (or the parent of the
                           Acquiror), directly or indirectly, as a result of the
                           transactions contemplated by the Offer;

                  (iii)    imposing or confirming limitations on the ability of
                           the Acquiror, directly or indirectly, effectively to
                           acquire or hold or to exercise full rights of
                           ownership of the Shares, including without limitation
                           the right to vote any Shares acquired or owned by the
                           Acquiror (or the parent of the Acquiror), directly or
                           indirectly, on all matters properly presented to the
                           Shareholders of the Company, including without
                           limitation the right to vote any shares of capital
                           stock of any Subsidiary (other than immaterial
                           Subsidiaries) directly or indirectly owned by the
                           Company;

                  (iv)     requiring divestiture by the Acquiror, directly or
                           indirectly, of any 
<PAGE>   18
                                      -3-


                           Shares; or

                  (v)      materially adversely affecting the business,
                           financial condition or results of operations of the
                           Company and its Subsidiaries taken as a whole or the
                           value of the Shares or of the Offer to the Acquiror;

         (e)      there shall not exist any prohibition at law against the
                  Acquiror making the Offer or taking up and paying for all of
                  the Shares under the Offer or completing any compulsory
                  acquisition or any subsequent acquisition transaction;

         (f)      there shall not have occurred (or if there shall have occurred
                  prior to the commencement of the Offer and not publicly
                  disclosed, there shall not have been generally disclosed or
                  disclosed to the Acquiror in writing after the commencement of
                  the Offer) any change (or any condition, event or development
                  involving a prospective change) in the business, assets,
                  capitalization, financial condition, licenses, permits,
                  rights, privileges or liabilities (including without
                  limitation any contingent liabilities that may arise through
                  outstanding, pending or threatened litigation or otherwise),
                  whether contractual or otherwise, of the Company and its
                  Subsidiaries considered as a whole which, in the reasonable
                  judgment of the Acquiror, is materially adverse and there
                  shall not have occurred any change (or any condition, event or
                  development involving a prospective change) in the business,
                  assets, capitalization, financial condition, licenses,
                  permits, rights, privileges or liabilities (including without
                  limitation any contingent liabilities that may arise through
                  outstanding, pending or threatened litigation or otherwise),
                  whether contractual or otherwise, of the Acquiror which is
                  materially adverse (other than a material adverse change that
                  has occurred as a result of acts or omissions within the
                  reasonable control of the Acquiror);

         (g)      (A) neither the board of directors of the Company nor any
                  committee thereof shall have approved or recommended any
                  proposal or any other acquisition of Shares other than the
                  Offer, (B) no corporation, partnership, person or other entity
                  or group shall have entered into a definitive agreement or an
                  agreement in principle with the Company with respect to a
                  take-over bid (other than the Offer), tender offer or exchange
                  offer, merger, sale of assets, amalgamation, plan of
                  arrangement, reorganization, consolidation, business
                  combination, recapitalization, liquidation, dissolution or
                  similar transaction with or involving the Company or any of
                  its Subsidiaries and (C) neither the board of directors of the
                  Company nor any committee thereof shall have resolved to do
                  any of the foregoing; and

         (h)      there shall not have occurred any material breach by the
                  Company of any of the representations, warranties or covenants
                  of the Pre-Acquisition Agreement or any termination of the
                  Pre-Acquisition Agreement pursuant to the terms thereof.

<PAGE>   19
                                      -4-

                  The foregoing conditions shall be for the exclusive benefit of
the Acquiror and may be waived by the Acquiror in whole or in part at any time
and from time to time, both before or after the expiry time.




<PAGE>   20


                                  SCHEDULE "B"

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY


(a)      ORGANIZATION. Each of the Company and each of its direct and indirect
         Subsidiaries (collectively, the "Subsidiaries") has been duly
         incorporated or formed under applicable law, is validly existing and
         has full corporate or legal power and authority to own its properties
         and conduct its businesses as currently owned and conducted. All of the
         outstanding shares of capital stock and other ownership interests of
         the Subsidiaries are validly issued, fully paid and non-assessable and
         all such shares and other ownership interests owned directly or
         indirectly by the Company are owned free and clear of all material
         liens, claims or encumbrances, and except as disclosed in writing to
         the Acquiror prior to the date hereof, there are no outstanding
         options, rights, entitlements, understandings or commitments
         (contingent or otherwise) regarding the right to acquire any shares of
         capital stock or other ownership interests in any of the Subsidiaries.

(b)      CAPITALIZATION. As of the date hereof, there are 29,679,025 Shares
         issued and outstanding. As at the date hereof, up to a maximum of
         2,199,000 Shares may be issued pursuant to outstanding stock option
         entitlements. Except as described in the immediately preceding
         sentence, there are no options, warrants, conversion privileges or
         other rights, agreements, arrangements or commitments obligating the
         Company or any Subsidiary to issue or sell any shares of any capital
         stock of the Company or any of its Subsidiaries or securities or
         obligations of any kind convertible into or exchangeable for any shares
         of capital stock of the Company, any Subsidiary or any other person,
         nor, except as disclosed to the Acquiror prior to the date hereof, is
         there outstanding any stock appreciation rights, phantom equity or
         similar rights, agreements, arrangements or commitments based upon the
         book value, income or any other attribute of the Company or any
         Subsidiary.

(c)      AUTHORITY. The Company has the requisite corporate power and authority
         to enter into this Agreement and to perform its obligations hereunder.
         The execution and delivery of this Agreement by the Company and the
         consummation by the Company of the transactions contemplated by this
         Agreement have been duly authorized by the board of directors of the
         Company and no other corporate proceedings on the part of the Company
         are necessary to authorize this Agreement or the transactions
         contemplated hereby. This Agreement has been duly executed and
         delivered by the Company and constitutes a valid and binding obligation
         of the Company, enforceable against the Company in accordance with its
         terms subject to bankruptcy, insolvency, reorganization, fraudulent
         transfer, moratorium and other laws relating to or affecting creditors'
         rights generally and to general principles of equity. Except as
         disclosed in writing to the Acquiror prior to the date hereof, the
         execution and delivery by the Company of this Agreement and performance
         by it of its obligations hereunder and (subject to satisfying the
         conditions to the Offer specified in clause 4(d) of Schedule "A" with
         respect to subparagraph A(ii) below) the completion of the Offer and
         the transactions contemplated thereby, will not:

<PAGE>   21
                                      -2


         (A)      result in a violation or breach of, require any consent to be
                  obtained under or give rise to any termination rights under
                  any provision of:

                  (i)      its or any Subsidiary's certificate of incorporation,
                           articles, by-laws or other charter documents,
                           including any unanimous shareholder agreement or any
                           other agreement or understanding with any party
                           holding an ownership interest in any Subsidiary;

                  (ii)     any law, regulation, order, judgment or decree; or

                  (iii)    any material contract, agreement, license, franchise
                           or permit to which the Company or any Subsidiary is
                           bound or is subject or is the beneficiary;

         (B)      give rise to any right of termination or acceleration of
                  indebtedness, or cause any indebtedness to come due before its
                  stated maturity or cause any available credit to cease to be
                  available; or

         (C)      result in the imposition of any encumbrance, charge or lien
                  upon any of its material assets or the material assets of any
                  Subsidiary, or restrict, hinder, impair or limit the ability
                  of the Company or any Subsidiary to carry on the business of
                  the Company or any Subsidiary as and where it is now being
                  carried on or as and where it may be carried on in the future.

(d)      ABSENCE OF CHANGES. Since September 30, 1997, and except as has been
         publicly disclosed in any document filed with the Ontario Securities
         Commission (i) the Company and the Subsidiaries have conducted their
         respective businesses only in the ordinary course, (ii) no liability or
         obligation of any nature (whether absolute, accrued, contingent or
         otherwise) material to the Company or any Subsidiary has been incurred,
         and (iii) there has not been any material adverse change in the
         financial conditions, results of operations or businesses of the
         Company or any Subsidiary.

(e)      NO MATERIAL MISREPRESENTATION. As at their respective dates, the public
         filings made by the Company under the Securities Act (Ontario) did not
         contain any material misstatement or any untrue statement of a material
         fact or omit to state a material fact required to be stated therein or
         necessary in order to make the statement made therein, in light of the
         circumstances under which they were made, not misleading.

(f)      FINANCIAL STATEMENTS. The audited consolidated balance sheets and
         consolidated statements of loss and deficit and consolidated statements
         of changes in financial position as at or for the periods ended
         September 30, 1997 and September 30, 1997, as applicable, as contained
         in the Company's 1997 Annual Report, were prepared in accordance with
         generally accepted accounting principles in Canada consistently
         applied, and fairly present the consolidated financial condition of the
         Company at the respective dates indicated and the results of operations
         of the Company (on a consolidated basis) for the periods covered.

<PAGE>   22
                                      -3-


(g)      LITIGATION, ETC. Except as set forth or specifically reflected in any
         document filed with the Ontario Securities Commission, or as disclosed
         in writing to the Acquiror prior to the date hereof, there is no claim,
         action, proceeding or investigation pending or, to the knowledge of the
         Company, threatened against or relating to the Company or any
         Subsidiary or affecting any of their properties or assets before any
         court or governmental or regulatory authority or body that, if
         adversely determined, is likely to have a material adverse effect on
         the Company or any Subsidiary or prevent or materially delay
         consummation of the transactions contemplated by this Agreement or the
         Offer, and the Company is not aware of any basis for any such claim,
         action, proceeding or investigation. Neither the Company nor any
         Subsidiary is subject to any outstanding order, writ, injunction or
         decree that has had or may have a material adverse effect or prevent or
         materially delay consummation of the transactions contemplated by this
         Agreement or the Offer.

(h)      ENVIRONMENTAL. Except as has been disclosed in writing to the Acquiror
         prior to the date hereof, neither the Company nor any Subsidiary is
         aware of, or has received:

                  (i)      any order or directive which relates to environmental
                           matters which requires any material work, repairs,
                           construction, or capital expenditures; or

                  (ii)     any demand, notice or other communication with
                           respect to or alleging the material breach of any
                           environmental, health, or safety law applicable to
                           the Company or any Subsidiary, including, without
                           limitation, any regulations respecting the use,
                           storage, treatment, transportation, or disposition of
                           environmental contaminants or hazardous substances or
                           materials.

(i)      INSURANCE. Policies of insurance in force as of the date hereof naming
         the Company as an insured adequately cover all risks reasonably and
         prudently foreseeable in the operation and conduct of the business of
         the Company and the Subsidiaries as would be customary in respect of
         the businesses carried on by the Company.

(j)      TAX MATTERS.

         (A)      DEFINITIONS. For purposes of this Agreement, the following
                  definitions shall apply:

                  (i)      The term "Taxes" shall mean all taxes, however
                           denominated, including any interest, penalties or
                           other additions that may become payable in respect
                           thereof, imposed by any federal, territorial, state,
                           local or foreign government or any agency or
                           political subdivision of any such government, which
                           taxes shall include, without limiting the generality
                           of the foregoing, all income 

<PAGE>   23
                                      -4-


                           or profits taxes (including, but not limited to,
                           federal income taxes and provincial income taxes),
                           payroll and employee withholding taxes, unemployment
                           insurance, social insurance taxes, sales and use
                           taxes, ad valorem taxes, excise taxes, franchise
                           taxes, gross receipts taxes, business license taxes,
                           occupation taxes, real and personal property taxes,
                           stamp taxes, environmental taxes, transfer taxes,
                           workers' compensation and other governmental charges,
                           and other obligations of the same or of a similar
                           nature to any of the foregoing, which the Company or
                           any of its material Subsidiaries is required to pay,
                           withhold or collect.

                 (ii)      The term "Returns" shall mean all reports, estimates,
                           declarations of estimated tax, information statements
                           and returns relating to, or required to be filed in
                           connection with, any Taxes.

         (B)      RETURNS FILED AND TAXES PAID. All Returns required to be filed
                  by or on behalf of the Company or any material Subsidiaries
                  have been duly filed on a timely basis and such Returns are
                  true, complete and correct. All Taxes shown to be payable on
                  the Returns or on subsequent assessments with respect thereto
                  have been paid in full on a timely basis, and no other Taxes
                  are payable by the Company or any material Subsidiaries with
                  respect to items or periods covered by such Returns.

         (C)      TAX RESERVES. The Company has paid or provided adequate
                  accruals in its financial statements for the year ended dated
                  September 30, 1997 for Taxes, including income taxes and
                  related deferred taxes, in conformity with generally accepted
                  accounting principles applicable in Canada.

         (E)      TAX DEFICIENCIES; AUDITS; STATUTES OF LIMITATIONS. Except as
                  disclosed in writing to the Acquiror, no deficiencies exist or
                  have been asserted with respect to Taxes of the Company or any
                  material Subsidiary. Neither the Company nor any material
                  Subsidiary is a party to any action or proceeding for
                  assessment or collection of Taxes, nor has such event been
                  asserted or threatened against the Company or any material
                  Subsidiary or any of their respective assets. No waiver or
                  extension of any statute of limitations is in effect with
                  respect to Taxes or Returns of the Company or any material
                  Subsidiary. Except as has been disclosed in writing to the
                  Acquiror, the Returns of the Company and any material
                  Subsidiary have never been audited by a government or taxing
                  authority, nor is any such audit in process, pending or
                  threatened.

(k)      PENSION AND TERMINATION BENEFITS. Other than as disclosed in writing to
         the Acquiror prior to the date hereof, the Company has provided
         adequate accruals in its financial statements for the year ended
         September 30, 1997 (or such amounts are fully funded) for all pension
         or other employee benefit obligations of the Company arising under or
         relating to each of the pension or retirement income plans or other
         employee benefit plans or agreements or policies maintained by or
         binding on the Company or any of its Subsidiaries as well as for any
         other 


<PAGE>   24
                                      -5-

         payment required to be made by the Company in connection with the
         termination of employment or retirement of any employee of the Company
         or any Subsidiary.


<PAGE>   25






                                  SCHEDULE "C"

                 REPRESENTATIONS AND WARRANTIES OF THE ACQUIROR


(a)      ORGANIZATION. The Acquiror has been duly incorporated and organized,
         and is validly existing, as a corporation under the laws of the State
         of Delaware and has the requisite corporate power and authority to
         carry on its business as it is now being conducted.

(b)      AUTHORITY. The Acquiror has the requisite corporate power and authority
         to enter into this Agreement and to carry out its respective
         obligations hereunder. The execution and delivery of this Agreement and
         the consummation of the transactions contemplated hereby have been duly
         authorized and no other corporate proceedings on the part of the
         Acquiror are necessary to authorize this Agreement and the transactions
         contemplated hereby. This Agreement has been duly executed and
         delivered by the Acquiror and constitutes a valid and binding
         obligation of the Acquiror, enforceable by the Company in accordance
         with its terms, subject to bankruptcy, insolvency, fraudulent transfer,
         reorganization, moratorium and other laws relating to or affecting
         creditors' rights generally and to general principles of equity.

(c)      FINANCING. The Acquiror has made adequate arrangements to ensure that
         required funds are available to effect payment in full for all Shares
         offered to be acquired pursuant to the Offer and pursuant to Section
         ERROR! REFERENCE SOURCE NOT FOUND. of the Agreement.



<PAGE>   1
                             OGLEBAY NORTON COMPANY
                                                                    Exhibit 99.1


                                      NEWS
                              FOR IMMEDIATE RELEASE


CLEVELAND, OHIO                                          FOR FURTHER INFORMATION
MAY 22, 1998                                             CONTACT JEFFREY S. GRAY
                                                          OGLEBAY NORTON COMPANY
                                                                  (216) 861-8736



              OGLEBAY NORTON ANNOUNCES TAKE-UP GLOBAL STONE SHARES
                               DEPOSITED TO OFFER


         Oglebay Norton Acquisition Company Limited, a subsidiary of Oglebay
Norton Company (The Nasdaq Stock Market: OGLE), today announced that it had
taken up and made payment to the Depositary for the approximately 98.6% of the
outstanding common shares of Global Stone Corporation (calculated on a fully
diluted basis) that were deposited in acceptance of its offer dated April 24,
1998. Oglebay Norton Acquisition Limited has also sent to non-depositing
shareholders the required notice pursuant to the compulsory acquisition
provisions of the Canada Business Corporations Act to acquire the remaining
outstanding common shares of Global Stone Corporation at the $7.80 per share
offer price.

         Global Stone Corporation, the fifth largest producer of lime in North
America, had net revenues of Cdn. $151 million for the fiscal year ended
September 30, 1997 from sales of lime, chemical limestone and construction
aggregates used in a variety of manufacturing processes and industries,
including iron and steel, pulp and paper, chemical, environmental, agricultural
and construction. Global Stone has approximately 700 employees with eight
operations in Canada and the United States.

         Oglebay Norton is a Cleveland, Ohio-based company engaged in Great
Lakes marine transportation and material handling, and the mining and marketing
of industrial sands and limestone. In 1997 the Company had revenues from
continuing operations of $145 million.


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