TIFFANY & CO
SC 13D, 1999-07-27
JEWELRY STORES
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<PAGE>   1


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------

                                  SCHEDULE 13D
                                 (RULE 13D-101)

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. __)*

                               Aber Resources Ltd.
                                (Name of Issuer)

                           Common Stock, no par value
                         (Title of Class of Securities)

                                   002916 10 4
                                 (CUSIP number)

                             Patrick B. Dorsey, Esq.
              Senior Vice President, General Counsel and Secretary
                                  Tiffany & Co.
                                727 Fifth Avenue
                            New York, New York 10022
                                 (212) 755-8000

                  (Name, address and telephone number of person
                authorized to receive notices and communications)

                                  July 19, 1999
             (Date of event which requires filing of this statement)

         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box / /.

         Note. Schedules filed in paper format shall include a signed original
and five copies of the schedule, including all exhibits. See Rule 13d-7(b) for
other parties to whom copies are to be sent.

- ---------------

         *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).




                              (Page 1 of 10 Pages)
<PAGE>   2
CUSIP NO. 002916 10 4               13D                PAGE  2   OF   10   PAGES




<TABLE>
<CAPTION>
<S>                                                                            <C>
1    NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE
     PERSONS

     TIFFANY & CO. INTERNATIONAL                                                I.R.S. IDENTIFICATION NO. 06-112-1421
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                                    (a)[ ]
                                                                                                          (b)[X]

3    SEC USE ONLY



4    SOURCE OF FUNDS*

     WC


5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)


6    CITIZENSHIP OR PLACE OF ORGANIZATION

       DELAWARE

    NUMBER OF       7        SOLE VOTING POWER
      SHARES
                             0

   BENEFICIALLY     8        SHARED VOTING POWER
     OWNED BY
                             8,000,000


       EACH         9        SOLE DISPOSITIVE POWER
    REPORTING
                             0

   PERSON WITH      10       SHARED DISPOSITIVE POWER

                             8,000,000


11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     8,000,000


12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                                  [ ]


13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     14.9%

14   TYPE OF REPORTING PERSON*

     CO

</TABLE>

                              (Page 2 of 10 Pages)
<PAGE>   3
CUSIP NO. 002916 10 4                  13D                 PAGE 3  OF  10  PAGES

<TABLE>
<CAPTION>
<S>                                                                          <C>
1    NAME OF REPORTING  PERSONS
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

     TIFFANY & CO.                                                           I.R.S. IDENTIFICATION NO. 13-322-8013
                                                                                                       (a)[ ]
                                                                                                       (b)[X]


2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*



3    SEC USE ONLY



4    SOURCE OF FUNDS*

     WC


5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
     TO ITEM 2(d) OR 2(e)




6    CITIZENSHIP OR PLACE OF ORGANIZATION

     DELAWARE


    NUMBER OF       7        SOLE VOTING POWER
      SHARES
                             0


   BENEFICIALLY     8        SHARED VOTING POWER
     OWNED BY
                             8,000,000


       EACH         9        SOLE DISPOSITIVE POWER
    REPORTING
                             0


   PERSON WITH      10       SHARED DISPOSITIVE POWER

                             8,000,000


11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           8,000,000


12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*                         [ ]

13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           14.9%


14         TYPE OF REPORTING PERSON*

           HC, CO

</TABLE>


                              (Page 3 of 10 Pages)
<PAGE>   4
ITEM 1.  SECURITY AND ISSUER

         This statement on Schedule 13D relates to shares of common stock, no
par value (the "Common Stock"), of Aber Resources Ltd., a British Columbia
corporation (the "Issuer"). The principal executive offices of the Issuer are
located at Suite 930, 355 Burrard Street, Vancouver, British Columbia, Canada
V6C 2G8.

ITEM 2.  IDENTITY AND BACKGROUND

         (a) - (c); (f): This statement on Schedule 13D is being filed by
Tiffany & Co. International, a Delaware corporation and the purchaser of
8,000,000 shares of the Issuer's Common Stock ("International"), and Tiffany &
Co., a Delaware corporation ("Parent," and collectively with International, the
"Reporting Persons," and each, a "Reporting Person"). International is a direct,
wholly owned subsidiary of Parent. As a result, Parent is deemed to be the
beneficial owner of the shares of Issuer Common Stock purchased by
International, as Parent has the ability to control the voting and disposition
decisions to be made by International with respect to the Common Stock. For
purposes of this statement on Schedule 13D, International and Parent are deemed
to share voting and disposition power with respect to the Common Stock.

         The business and principal office address of each of the Reporting
Persons is 727 Fifth Avenue, New York, New York 10022. The Reporting Persons are
international jewelry and specialty retailers.

         To the best of the Reporting Persons' knowledge as of the date hereof,
the name, business address, present principal occupation or employment and
citizenship of each executive officer and director of each Reporting Person, and
the name, principal business and address of any corporation or other
organization in which such employment is conducted is set forth on Schedules I
and II hereto. The information contained in Schedules I and II is incorporated
herein by reference.

         (d) - (e): During the last five years, none of the Reporting Persons,
their respective executive officers or their respective directors have been
convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors) or were a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction resulting in a judgment, decree or
final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         All of the shares of Common Stock of the Issuer purchased by
International were purchased for approximately $72 million (Can $104 million)
with the working capital of the Reporting Persons.

ITEM 4.  PURPOSE OF TRANSACTION

         All Common Stock purchased by International was purchased pursuant to a
Subscription Agreement (a copy of which is included as Exhibit 99.1 hereto), and
is being held for investment


                              (Page 4 of 10 Pages)
<PAGE>   5
purposes. Subject to economic considerations and market conditions, the
Reporting Persons may, from time to time, acquire additional shares of Common
Stock in the open market or in privately negotiated transactions and, subject to
the restrictions described in Item 6 below, may dispose of such securities or
the securities they presently own in the open market or in private transactions.

         An affiliate of the Reporting Persons, Tiffany & Co. ICT, Inc., an
indirect wholly owned subsidiary of Parent, intends to form a joint venture
("Joint Venture") with Aber Diamond Mines Ltd., a wholly owned subsidiary of the
Issuer. Under the terms of the proposed Joint Venture and related diamond supply
agreements (which will provide for the supply of diamonds both into and out of
the Joint Venture), the Joint Venture will purchase a portion of the anticipated
rough diamond supply from the Diavik Diamonds Project and sell a portion of that
supply to Tiffany and Company, a wholly owned subsidiary of Parent. The Joint
Venture partners will share equally in any profits and losses of the Joint
Venture.

         The Reporting Persons and their affiliates may engage in these and
other activities intended to influence the business strategy or management of
the Issuer. The Issuer also agreed, pursuant to the terms of the Subscription
Agreement, to increase the size of its Board of Directors by one and to nominate
a representative from the Reporting Persons to the Issuer's Board of Directors
at each annual meeting of shareholders as long as the Reporting Persons and
their affiliates hold the shares of the Issuer's Common Stock purchased pursuant
to the Subscription Agreement.

         Except as indicated above, the Reporting Persons have no plans or
proposals which relate to or would result in any of the events, actions or
conditions specified in paragraphs (a) through (j) of Item 4 of Schedule 13D.

         All references to the Subscription Agreement set forth in this Item 4
are qualified in their entirety by reference to the copy of the Subscription
Agreement included as Exhibit 99.1 to this Schedule 13D, which is incorporated
herein by reference.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         (a)      This statement on Schedule 13D relates to 8,000,000 shares of
                  Common Stock beneficially owned by the Reporting Persons,
                  which constitute approximately 14.9% of the issued and
                  outstanding shares of Common Stock of the Issuer.

         (b)      For purposes of this statement on Schedule 13D, International
                  and Parent are deemed to share voting and disposition power
                  over the 8,000,000 shares of Common Stock.

         (c)      International purchased 8,000,000 shares of Common Stock from
                  the Issuer for approximately $9.00 per share (Can $13.00 per
                  share) on July 19, 1999 pursuant to a Subscription Agreement,
                  a copy of which is included as Exhibit 99.1 hereto and which
                  is incorporated herein by reference.

         (d)      Not applicable.


                              (Page 5 of 10 Pages)
<PAGE>   6
         (e)      Not applicable.

ITEM 6.           CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER

         The information set forth, or incorporated by reference, in Item 4 is
hereby incorporated by reference. Pursuant to the terms of the Subscription
Agreement, a copy of which is included as Exhibit 99.1 hereto and which is
incorporated herein by reference, the Reporting Persons and their affiliates
have agreed not to sell any shares of the Issuer's Common Stock prior to the
second anniversary of the last day of the first month of commercial production
from the Diavik diamond mine, except:

         (i)      in acceptance of a third party's take-over bid;

         (ii)     in participating in a merger, amalgamation or similar
                  transaction involving the Issuer which has been approved by
                  the Issuer's Board of Directors; or

         (iii)    at any time under the following terms and conditions. In the
                  event that International wishes to sell or cause to be sold
                  any of the Issuer's Common Stock owned, directly or
                  indirectly, by it or its affiliates, it shall first give to
                  the Issuer not less than 90 and not more than 120 days'
                  written notice (the "Sale Notice") of such proposed sale,
                  specifying the number of Common Shares (the "Subject Shares")
                  it wishes to sell, the date on which it proposes to effect
                  such sale (the "Sale Date") and the proposed purchaser, if
                  any. Upon receipt of a Sale Notice, the Issuer shall be
                  permitted during the period up to 5:00 p.m. (Toronto local
                  time) on the third business day (the "Designation Deadline")
                  prior to the Sale Date to designate a purchaser (the
                  "Designated Purchaser") of the Subject Shares by written
                  notice to International in which event International shall
                  sell the Subject Shares to the Designated Purchaser on the
                  Sale Date for a cash purchase price per Subject Share (the
                  "Market Price") equal to the simple average closing trading
                  price of the Issuer's Common Stock on The Toronto Stock
                  Exchange (or other principal trading market if the Common
                  Stock is not then so listed) for the 20 trading days
                  immediately preceding the Designation Deadline (appropriately
                  adjusted to reflect any stock split or consolidation occurring
                  during such 20 trading day period). In the event the Issuer
                  fails to give notice of a Designated Purchaser prior to the
                  Designation Deadline, International shall be free to effect a
                  sale of the Subject Shares, or any of them, on the Sale Date
                  and for a period of 30 days thereafter at a price per Subject
                  Share which is not less than the Market Price.

         Except as described in this Schedule 13D, to the Reporting Persons'
knowledge, there exist no contracts, arrangements, understandings or
relationships (legal or otherwise) among the persons named in Item 2 and between
such persons and any other persons with respect to any securities of the Issuer,
including but not limited to transfer or voting of any securities, finders'
fees, joint ventures, loan or option arrangements, puts or calls, guarantees of
profits, division of profits or loss, or the giving or withholding of proxies.


                              (Page 6 of 10 Pages)
<PAGE>   7
ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

Exhibit 99.1:       Subscription Agreement, dated as of July 16, 1999, between
                    Tiffany & Co. International and Aber Resources Ltd.


                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief,
each of the undersigned certify that the information set forth in this statement
is true, complete and correct.

         Dated:   July 27, 1999


                           TIFFANY & CO. INTERNATIONAL


                           By: /s/ Patrick B. Dorsey
                               Patrick B. Dorsey
                               Vice President and Secretary


                           TIFFANY & CO.


                           By: /s/ Patrick B. Dorsey
                               Patrick B. Dorsey
                               Senior Vice President, General Counsel
                               and Secretary

                              (Page 7 of 10 Pages)
<PAGE>   8
                                   Schedule I

         DIRECTORS AND EXECUTIVE OFFICERS OF TIFFANY & CO. INTERNATIONAL

         The following table sets forth the name, business address and present
principal occupation or employment of each director and executive officer of
Tiffany & Co. International. Except as indicated below, each such person is a
U.S. citizen and the business address of each such person is 727 Fifth Avenue,
New York, New York 10022.
<TABLE>
<CAPTION>

                BOARD OF DIRECTORS OF TIFFANY & CO. INTERNATIONAL

Name and Title                            Present Principal Occupation

<S>                                       <C>
Michael J. Kowalski                       President and Chief Executive Officer, Director Tiffany & Co.

James E. Quinn                            Vice Chairman of the Board of Tiffany & Co.

James N. Fernandez                        Executive Vice President and Chief Financial Officer,
                                          Tiffany & Co.

Patrick B. Dorsey                         Senior Vice President, General Counsel and Secretary,
                                          Tiffany & Co.

</TABLE>
                EXECUTIVE OFFICERS OF TIFFANY & CO. INTERNATIONAL

<TABLE>
<CAPTION>
Name                                      Title and Present Principal Occupation

<S>                                       <C>
Michael J. Kowalski                       President, Tiffany & Co. International; President and Chief Executive
                                          Officer, Tiffany & Co.

James N. Fernandez                        Vice President and Chief Financial Officer, Tiffany & Co. International;
                                          Executive Vice President and Chief Financial Officer, Tiffany & Co.

Patrick B. Dorsey                         Vice President and Secretary, Tiffany & Co. International; Senior Vice
                                          President, General Counsel and Secretary,
                                          Tiffany & Co.


</TABLE>
                              (Page 8 of 10 Pages)
<PAGE>   9
                                   Schedule II

                DIRECTORS AND EXECUTIVE OFFICERS OF TIFFANY & CO.

         The following table sets forth the name, business address and present
principal occupation or employment of each director and executive officer of
Tiffany & Co. Except as indicated below, each such person is a U.S. citizen and
the business address of each such person is 727 Fifth Avenue, New York, New York
10022.
<TABLE>
<CAPTION>

                       BOARD OF DIRECTORS OF TIFFANY & CO.

Name and Title                            Present Principal Occupation
<S>                                       <C>
William R. Chaney                         Chairman of the Board of Tiffany & Co.

Michael J. Kowalski                       President and Chief Executive Officer, Director Tiffany & Co.

James E. Quinn                            Vice Chairman of the Board of Tiffany & Co.

Rose Marie Bravo                          Worldwide Chief Executive of Burberry Limited.  The address of Burberry
                                          Limited is 1350 Avenue of the Americas, 30th Floor, New York, New York
                                          10019.

Samuel L. Hayes III                       Jacob H. Schiff Professor of Investment Banking at Harvard Business
                                          School.  The address of Harvard Business School is Soldiers Field, Boston,
                                          Massachusetts 02163.

Charles K. Marquis                        Senior Advisor to Investcorp International Inc.  The address of Investcorp
                                          International Inc. is 280 Park Avenue, 37th Floor West, New York, New York
                                          10017.

William A. Shutzer                        Executive Vice President of ING Baring Furman Selz LLC.  The address of
                                          ING Baring Furman Selz LLC is 230 Park Avenue, New York, New York 10169.

Geraldine Stutz                           Principal partner of GSG Group.  The address of GSG Group is 158A E. 70th
                                          Street, New York, New York 10022.

</TABLE>
                              (Page 9 of 10 Pages)
<PAGE>   10
                       EXECUTIVE OFFICERS OF TIFFANY & CO.

<TABLE>
<CAPTION>
Name                                      Title and Present Principal Occupation
<S>                                       <C>
Michael J. Kowalski                       President and Chief Executive Officer, Tiffany & Co.

James N. Fernandez                        Executive Vice President and Chief Financial Officer,
                                          Tiffany & Co.

Patrick B. Dorsey                         Senior Vice President, General Counsel and Secretary,
                                          Tiffany & Co.

Beth O. Canavan                           Senior Vice President - U.S. Retail Sales, Tiffany & Co.

Linda A. Hanson                           Senior Vice President - Merchandising, Tiffany & Co.

Fernanda M. Kellogg                       Senior Vice President - Public Relations, Tiffany & Co.

Caroline D. Naggiar                       Senior Vice President - Marketing, Tiffany & Co.

John S. Petterson                         Senior Vice President - Corporate Sales, Tiffany & Co.

</TABLE>



                             (Page 10 of 10 Pages)

<PAGE>   1
                                                                    EXHIBIT 99.1
                    PRIVATE PLACEMENT SUBSCRIPTION AGREEMENT


                  DATED the 16th day of July, 1999

BETWEEN:

         TIFFANY & CO. INTERNATIONAL, a corporation incorporated under the laws
         of the State of Delaware
         (the "Purchaser")

                                                              OF THE FIRST PART,

             -  and  -

         ABER RESOURCES LTD., a corporation amalgamated under the laws of the
         Province of British Columbia
         (the "Company")

                                                             OF THE SECOND PART.



     WHEREAS the Purchaser understands that the Company is prepared to issue and
sell to the Purchaser 8,000,000 common shares of the Company (the "Purchased
Shares") on the terms and conditions set forth below;

     AND WHEREAS the Purchaser, subject to the terms and conditions set out
below, offers to purchase from the Company, and by its acceptance of this
Agreement, the Company agrees to issue and sell the Purchased Shares to the
Purchaser;

     NOW THEREFORE THIS AGREEMENT WITNESSES that in consideration of the mutual
covenants and agreements contained herein and for other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged by
each of the parties hereto, the parties hereto covenant and agree as follows:

                                    Article 1
                                 INTERPRETATION

1.1      Definitions

         In this Agreement, except as otherwise expressly provided, the
following words or expressions shall have the meanings set out below:

         (a)      "Affiliate" has the meaning ascribed thereto in the Securities
         Act;

         (b)      "Agreement" means this agreement and all amendments made
         hereto by


<PAGE>   2
         written agreement between the parties hereto together with
         all schedules hereto and thereto;

         (c)      "Authority" means any governmental or regulatory authority,
         body, agency or department, whether federal, provincial, municipal or
         local, and any court, tribunal or similar body;

         (d)     "Business Day" means a day of the year other than a Saturday
         or Sunday or statutory holiday in the Province of British Columbia or
         the State of New York;

         (e)      "Board of Directors" means the board of directors of the
         Company;

         (f)      "Closing Date" means July 19, 1999;

         (g)      "Common Shares" means the common shares in the capital of the
         Company;

         (h)      "Company's Opinion" means the opinion or opinions of the
         Company's legal counsel to be delivered at or prior to closing in the
         form of Schedule 1.1(h);

         (i)      "Confidentiality Agreement" means the confidentiality
         agreement to be dated the Closing Date between the Purchaser or an
         Affiliate of the Purchaser and the Company in the form of Schedule
         1.1(i);

         (j)      "Diamond Supply Agreement" means the diamond supply agreement
         to be entered into between the Purchaser, the Company (or Affiliates of
         each of them) and the Partnership in the form of Schedule 1.1(j);

         (k)      "Diavik JV Agreement" means the Diavik joint venture agreement
         made as of March 23, 1995 between the Company and Kennecott Canada
         Inc.;

         (l)      "Diavik Mine" means the Diavik Diamonds Project in the
         Northwest Territories of Canada situated on the Property;

         (m)      "Environmental Laws" means all federal, municipal or local
         laws, statutes, regulations, ordinances, rules, guidelines, orders,
         directives and other requirements of any government or political
         subdivision, agency or instrumentality or of any court, tribunal or
         other similar body, relating to environmental or health matters,
         including legislation governing the labelling, use and storage of
         Hazardous Substances;

         (n)      "Environmental Orders" means applicable orders, decisions, or
         the like rendered by any Authority under or pursuant to any
         Environmental Laws;

         (o)      "Environmental Permits" means all permits, certificates,
         approvals, registrations and licenses issued by any Authority and
         relating to or required for the operation by the Company or the
         Subsidiaries of their Properties in

                                       2
<PAGE>   3
         compliance with all Environmental Laws or Environmental Orders;

         (p)      "ETA" means the Excise Tax Act (Canada);

         (q)      "Financial Information" means the information contained in the
         audited consolidated financial statements of the Company for the year
         ended January 31, 1999 together with the auditors report thereon, and
         the interim unaudited financial statements of the Company in respect of
         the three month period ended April 30, 1999;

         (r)      "GST" means all Taxes payable under the ETA or under any
         provincial legislation similar to the ETA and any reference to a
         specific provision of the ETA or any such provincial legislation shall
         refer to any successor provision thereto of like or similar effect;

         (s)      "Hazardous Substances" means PCBs, asbestos, urea formaldehyde
         foam insulation or any other substance or material that is prohibited,
         controlled or regulated under any Environmental Laws;

         (t)      "Hazardous Waste" means any contaminants, pollutants,
         dangerous substances, including asbestos, liquid waste, special waste,
         toxic substances, hazardous or toxic chemicals, hazardous materials or
         Hazardous Substances as defined in or pursuant to any Environmental
         Laws;

         (u)      "Knowledge" or "Know" means, with respect to any Person, the
         actual knowledge of such Person or any director or officer of such
         Person, or all of them, as the case may be, as well as matters that
         such Person or any director or officer of such Person, or all of them,
         as the case may be, should have reasonably known, after due inquiry,
         which due inquiry shall extend only to:

                  (i)      the financial, legal and investment advisors of the
                           Company and its Subsidiaries in connection with this
                           transaction who are not employees of the Company or
                           its Subsidiaries; and

                  (ii)     any auditor or bookkeeper retained or employed in
                           connection with the business of the Company or the
                           Subsidiaries;

         (v)      "Legal Proceeding" means any litigation, action, suit,
         investigation, hearing, claim, complaint, grievance, arbitration,
         administrative or other proceeding and includes any appeal or review
         and any application for same;

         (w)      "License" means any authorization, permit, approval, grant,
         license, quota, consent, commitment, right or privilege issued or
         granted by any Authority;

         (x)      "Material Adverse Effect" means any effect that is or could
         reasonably be expected to be materially adverse to the financial
         condition or the earnings,



                                       3
<PAGE>   4
         business, affairs or prospects of the Company and the Subsidiaries
         considered as a whole;

         (y)      "Operative Agreements" means this Agreement, the
         Confidentiality Agreement, the Partnership Agreement, the Diamond
         Supply Agreement and the Rough Diamond Agreement;

         (z)      "Partnership" means the partnership to be formed between the
         Purchaser and the Company (or Affiliates of each of them) pursuant to
         the Partnership Agreement;

         (aa)     "Partnership Agreement" means the partnership agreement
         governing the Partnership to be entered into prior to or at Closing
         between the Purchaser and the Company (or Affiliates of each of them)
         in the form of Schedule 1.1(aa);

         (bb)     "Person" means an individual, partnership, limited
         partnership, unincorporated association, organization, syndicate,
         corporation, trust and a trustee, executor, administrator or other
         legal or personal representative;

         (cc)     "Properties" means all of the mining claims and mining leases
         listed in Schedule 1.1(cc) and all mining leases which may replace such
         mining claims and all other interests in real property which are
         acquired and held subject to the Diavik JV Agreement;

         (dd)     "Public Record" means the annual information form of the
         Company dated June 15, 1999, the comparative audited financial
         statements of the Company for the fiscal year ended January 31, 1999
         together with the report of the auditors thereon, the Company's 1998
         annual report, the unaudited consolidated financial statements of the
         Company for the fiscal quarter ended April 30, 1999, and for the
         comparative period and fiscal 1998, as contained in the Company's first
         quarter report to shareholders, the management information circular of
         the Company dated June 10, 1999 to be used in connection with the
         Company's July 30, 1999 annual general meeting of shareholders together
         with all press releases of the Company filed since January 31, 1999
         under the Securities Laws with Canadian or United States regulators;

         (ee)     "Purchased Shares" has the meaning attributed to it in the
         first recital;

         (ff)     "Release" means a releasing, spilling, leaking, pumping,
         pouring, emitting, emptying, discharging, injecting, escaping,
         leaching, disposing or dumping which is in breach of any Environmental
         Law or Environmental Order;

         (gg)     "Rough Diamond Agreement" means the rough diamond supply
         agreement to be entered into between the Purchaser, the Company (or
         Affiliates of each of them) and the Partnership in the form of Schedule
         1.1(gg);

                                       4
<PAGE>   5
         (hh)     "Securities Act" means the Securities Act (Ontario);

         (ii)     "Securities Laws" means, collectively, the applicable
         securities laws of each of the provinces and territories of Canada and
         the respective regulations made thereunder together with all applicable
         rules, orders, notices and rulings of the securities regulatory
         authorities in such provinces and territories, the rules of The Toronto
         Stock Exchange together with the United States Securities Act of 1933,
         the United States Securities and Exchange Act of 1934, the rules and
         regulations adopted, in each case, thereunder by the Securities and
         Exchange Commission, and any applicable state or blue sky securities
         laws;

         (jj)     "Subsidiaries" means Aber Diamond Mines Ltd.;

         (kk)     "Tax Act" means the Income Tax Act (Canada);

         (ll)     "Tax" means all governmental taxes, levies, duties,
         assessments, reassessments and other charges of any nature whatsoever,
         whether direct or indirect, including income tax, profits tax, gross
         receipts tax, corporation tax, sales and use tax, wage tax, payroll
         tax, worker's compensation levy, capital tax, stamp duty, real and
         personal property tax, land transfer tax, customs or excise duty,
         excise tax, turnover or value added tax on goods sold or services
         rendered, withholding tax, social security and unemployment insurance
         charges or retirement contributions, and any interest, fines, additions
         to tax and penalties thereon;

         (mm)     "Time of Closing" means 10:00 a.m. (Toronto time) on the
         Closing Date; and

         (nn)     "TSE Questionnaire" means The Toronto Stock Exchange
         questionnaire and undertaking of the form of which is attached as
         Schedule 1.1(nn).

1.2      Construction

         In this Agreement:

         (a)      words denoting the singular include the plural and vice versa
                  and words denoting any gender include all genders;

         (b)      the words "including", "include", and "includes" shall mean
                  "including without limitation", "include, without limitation"
                  and "includes, without limitation", respectively;

         (c)      any reference to a statute shall mean the statute in force as
                  at the date hereof and any regulation in force thereunder,
                  unless otherwise expressly provided;

         (d)      the use of headings is for convenience of reference only and
                  shall not affect the construction of this Agreement;

                                       5
<PAGE>   6
         (e)      when calculating the period of time within which or following
                  which any act is to be done or step taken, the date which is
                  the reference day in calculating such period shall be
                  excluded. If the last day of such period is not a Business
                  Day, the period shall end on the next Business Day; and

         (f)      any tender of documents or money under this Agreement may be
                  made upon the parties or their respective counsel and money
                  may be tendered by bank draft drawn upon a Canadian chartered
                  bank or by negotiable cheque payable in Canadian funds and
                  certified by a Canadian chartered bank.


1.3      Accounting Principles

         Wherever in this Agreement reference is made to generally accepted
accounting principles, such reference shall be deemed to be the Canadian
generally accepted accounting principles from time to time approved by the
Canadian Institute of Chartered Accountants, or any successor institute,
applicable as at the date on which such calculation is made or required to be
made in accordance with generally accepted accounting principles.

1.4      Schedules

         The following are the schedules annexed hereto and incorporated by
reference herein and deemed to be part of this Agreement:

                  Schedule 1.1(h)  -        Company's Opinion
                  Schedule 1.1(i)  -        Confidentiality Agreement
                  Schedule 1.1(j)  -        Diamond Supply Agreement
                  Schedule 1.1(aa) -        Partnership Agreement
                  Schedule 1.1(cc) -        Properties
                  Schedule 1.1(gg) -        Rough Diamond Agreement
                  Schedule 1.1(nn) -        TSE Questionnaire

                                    Article 2
                             Subscription for Shares

2.1      Subscription for Shares

         The Purchaser hereby subscribes for the purchase from the Company,
subject to the terms and conditions set forth herein, of the Purchased Shares at
a deemed price of Cdn.$13.00 per Purchased Share, for an aggregate subscription
price of Cdn.$104,000,000 (the "Purchase Price").

2.2      Payment of Purchase Price

         The Purchaser shall satisfy the Purchase Price by delivering at Closing
to the Company a certified cheque made payable to the Company in Canadian funds
in an amount equal to the Purchase Price.

                                       6


<PAGE>   7
                                    Article 3
                                     Closing

3.1      Closing

         Closing of the transactions contemplated by this Agreement (the
"Closing") will be completed at the offices of Stikeman, Elliott, Commerce Court
West, Suite 5300, Toronto, Ontario, at the Time of Closing on the Closing Date
or at such place and time as may be agreed to by the parties.

3.2      Closing Procedures

         (a) At or before Closing, the Company and the Purchaser shall take or
         cause to be taken all actions, steps and corporate proceedings
         necessary or desirable to validly and effectively approve or authorize
         the completion of the transactions herein provided for and the
         instruments executed or to be executed and delivered hereunder; and the
         Company shall deliver or cause to be delivered to the Purchaser at the
         Time of Closing and subject to fulfillment of the provisions of Section
         3.2(b) all documents required to be delivered hereunder consisting of:

                  (i)      a certificate for the Purchased Shares registered in
                           the name of the Purchaser;

                  (ii)     the Confidentiality Agreement and the Partnership
                           Agreement duly executed by the Company or an
                           Affiliate of the Company;

                  (iii)    the officers' certificate of the Company referred to
                           in Section 4.1(d) of this Agreement; and

                  (iv)     the Company's Opinion.

         (b) At the Time of Closing and subject to fulfillment of the foregoing
         provisions of Section 3.2(a), the Purchaser shall deliver or cause to
         be delivered to the Company all documents and payments required to be
         delivered hereunder consisting of:

                  (i)      the certified cheque referred to in Section 2.2;

                  (ii)     the Confidentiality Agreement and the Partnership
                           Agreement duly executed by the Purchaser or an
                           Affiliate of the Purchaser;

                  (iii)    the officers' certificate of the Purchaser referred
                           to in Section 5.1(d) of this Agreement; and

                  (iv)     the TSE Questionnaire duly completed and executed by
                           the Purchaser.

                                    Article 4


                                       7
<PAGE>   8
                Conditions of Closing in favour of THE PURCHASER

4.1      Conditions

         The Purchaser's obligation to subscribe for and purchase the Purchased
Shares, to execute or cause an Affiliate of the Purchaser to execute the
Confidentiality Agreement and the Partnership Agreement, and to otherwise fulfil
its obligations hereunder on the Closing Date is conditional upon the
satisfaction of the following conditions, each of which is for the exclusive
benefit of the Purchaser and may be waived in whole or in part by the Purchaser
at any time:

         (a) the representations and warranties of the Company other than the
         representations and warranties made in Section 6.1(g) herein shall
         remain true and correct as of the Time of Closing;

         (b) the Company shall have performed or complied with all of the terms,
         covenants and conditions of this Agreement to be performed or complied
         with by the Company at or prior to the Time of Closing;

         (c) all necessary corporate action shall have been taken by the Company
         to authorize the execution and delivery of this Agreement and the
         performance of its provisions;

         (d) the Company shall have delivered to the Purchaser a certificate
         dated the Closing Date, duly executed by the President and Chief
         Executive Officer, and the Vice-President Corporate Development and
         Secretary of the Company, confirming the accuracy of items (a), (b) and
         (c) above;

         (e) the Company shall have delivered to the Purchaser a certificate
         dated within two Business Days of the Closing Date issued by the
         Company's registrar and transfer agent certifying the number of Common
         Shares which are issued and outstanding as of the date on which such
         certificate is dated; and

         (f) at or before the Time of Closing, the Purchaser shall have received
         the Company's Opinion, satisfactory in form and substance to the
         Purchaser and its counsel, acting reasonably, which shall include the
         following:

                  (i)      the Company is incorporated and is existing under the
                           laws of the Province of British Columbia;

                  (ii)     the authorized capital of the Company consists of
                           100,000,000 Common Shares;

                  (iii)    the Company has the requisite corporate power and
                           authority to perform its obligations under the terms
                           of this Agreement and each of the Company and the
                           Subsidiaries has the requisite corporate power and
                           authority to perform its obligations under the terms
                           of each of the


                                       8
<PAGE>   9
                           Operative Agreements to which it is a party;

                  (iv)     each of the Subsidiaries is duly incorporated and is
                           validly subsisting under the laws of the jurisdiction
                           of its incorporation;

                  (v)      the authorized capital of Aber Diamond Mines Ltd.
                           ("ADM") consists of an unlimited number of Class A
                           shares without nominal or par value and an unlimited
                           number of Class B shares without nominal or par value
                           of which 20,600,002 Class A shares are issued and
                           outstanding;

                  (vi)     the Company is the registered owner of all of the
                           securities of ADM;

                  (vii)    the Purchased Shares have been issued as fully paid
                           and non-assessable shares;

                  (viii)   the issuance by the Company to the Purchaser of the
                           Purchased Shares pursuant to the terms of this
                           Agreement is exempt from the registration and
                           prospectus requirements of the Securities Laws and
                           the first trade of the Purchased Shares by the
                           Company will be exempt from the Securities Laws of
                           British Columbia and Ontario subject to the
                           applicable "hold period" prescribed by such
                           Securities Laws having elapsed;

                  (ix)     the Company has received all necessary approvals to
                           permit the issuance of the Purchased Shares to the
                           Purchaser pursuant to the terms of this Agreement;

                  (x)      the execution, delivery and performance of this
                           Agreement and each of the Operative Agreements to
                           which either the Company or the Subsidiaries is a
                           party have been duly authorized by the Company or the
                           Subsidiaries, as applicable, and this Agreement and
                           each of the Operative Agreements to which either the
                           Company or the Subsidiaries is a party have been duly
                           executed and delivered by the Company or the
                           Subsidiaries, as the case may be, and are legally
                           binding obligations of the Company or the
                           Subsidiaries, as the case may be, enforceable against
                           one of them in accordance with each of such
                           agreements' terms, subject to usual opinion
                           qualifications; and

                  (xi)     The Toronto Stock Exchange has accepted notice for
                           filing of the transactions contemplated hereby and
                           shall have conditionally listed the Purchased Shares.

                                    Article 5
                 Conditions of Closing in favour of the Company

5.1      Conditions


                                       9
<PAGE>   10
         The Company's obligation to sell the Purchased Shares to the Purchaser,
to execute or cause an Affiliate of the Company to execute the Confidentiality
Agreement and the Partnership Agreement, and to otherwise fulfil its obligations
hereunder on the Closing Date is conditional upon the satisfaction of the
following conditions, each of which are for the Company's exclusive benefit and
may be waived in whole or in part by the Company at any time:

         (a) the representations and warranties of the Purchaser herein shall
         remain true and correct as of the Time of Closing;

         (b) the Purchaser shall have performed or complied with all of the
         terms, covenants and conditions of this Agreement to be performed or
         complied with it at or prior to the Time of Closing;

         (c) all necessary corporate action shall have been taken by the
         Purchaser to authorize the execution and delivery of this Agreement and
         the performance of its provisions;

         (d) the Purchaser shall have delivered to the Company a certificate
         dated the Closing Date, duly executed by the President and Chief
         Executive Officer, and the Chief Financial Officer of the Purchaser,
         confirming the accuracy of items (a), (b) and (c) above; and

         (e) the Purchaser shall have delivered to the Company an opinion of its
         counsel addressing those matters in respect of the Purchaser or its
         Affiliates as are to be addressed in respect of the Company or its
         Affiliates pursuant to the opinions described in paragraphs 4.1(f)(i),
         (iii) and (x) above.

                                    Article 6
                  Representations and Warranties of the Company

6.1      Representations and Warranties

         The Company makes, as of the date hereof and the Closing Date, the
following representations and warranties and acknowledges that the Purchaser is
relying on such representations and warranties in entering into this Agreement
and purchasing the Purchased Shares from the Company:

         (a) each of the Company and each Subsidiary that carries on a material
         portion of the business of the Company (on a consolidated basis) has
         been duly incorporated and is validly existing under the laws of its
         jurisdiction and is conducting its business in compliance with all
         applicable laws, rules and regulations of each jurisdiction in which it
         carries on business, except for such non-compliances that, in the
         aggregate, has not and will not result in a Material Adverse Effect and
         each of the Company and each Subsidiary holds all material licences,
         registrations and qualifications in all jurisdictions in which it
         carries on business necessary to carry on its business as now conducted
         by it, except where


                                       10
<PAGE>   11
         and to the extent that the failure to do so has not had and will not
         result in a Material Adverse Effect;

         (b) each of the Company and each Subsidiary is not: (i) in violation of
         its articles or by-laws; or (ii) in default in the performance or
         observance of any obligation, agreement, covenant or condition
         contained in any contract, indenture, mortgage, loan agreement, note,
         lease or other instrument to which it is a party or by which it may be
         bound or to which any of its property or assets are subject, other than
         defaults that in the aggregate, have not had and will not have a
         Material Adverse Effect;

         (c) no material consent, approval or action of, filing with or notice
         to any Authority on the part of the Company or the Subsidiaries is
         required, including in respect of the Properties, in connection with
         the execution, delivery and performance by the Company of this
         Agreement or any of the other Operative Agreements or the consummation
         of the transactions contemplated hereby or thereby by the Company;

         (d) this Agreement and each of the other Operative Agreements to which
         the Company is a party and the transactions to be completed by the
         Company hereunder and thereunder have been duly authorized by all
         necessary corporate action on the party of the Company and this
         Agreement and each of the other Operative Agreements to which the
         Company is a party has been duly executed and delivered by the Company;

         (e) the execution and delivery of this Agreement, the Operative
         Agreements to which the Company is a party, the fulfillment of the
         terms hereof by the Company and the issue, sale and delivery at the
         Time of Closing of the Purchased Shares do not and will not result in
         any breach of the articles, by-laws or resolutions of the Company or
         any agreement or instrument to which the Company or any of the
         Subsidiaries is a party or by which the Company or a Subsidiary is
         contractually bound;

         (f) the Company is a reporting issuer not in default or has equivalent
         status under all of the Securities Laws;

         (g) the authorized capital of the Company consists of 100,000,000
         Common Shares of which, as of the date hereof, there are 45,827,883
         Common Shares issued and outstanding and of which there are 2,245,000
         the subject of employee stock options granted pursuant to the Company's
         stock option plan;

         (h) no person has any agreement, option, right or privilege with or
         against the Company for the purchase, subscription or issuance of
         securities, issued or unissued of the Company, other than pursuant to
         the provisions of: (i) this Agreement; and (ii) the Company's employee
         stock option plan;


                                       11
<PAGE>   12
         (i) each of the Subsidiaries is duly incorporated and is validly
         subsisting under the laws of the jurisdiction of its incorporation;

         (j) the authorized capital of ADM consists of an unlimited number of
         Class A shares without nominal or par value and an unlimited number of
         Class B shares without nominal or par value of which 20,600,002 Class A
         shares are issued and outstanding;

         (k) the Company is the registered owner of all of the securities of
         ADM;

         (l) Diavik Diamond Mines Inc. is the recorded holder of each of the
         Properties listed in Schedule 1.1(cc);

         (m) the issuance by the Company to the Purchaser of the Purchased
         Shares pursuant to the terms of this Agreement is exempt from the
         registration and prospectus requirements of the Securities Laws and the
         first trade of the Purchased Shares by the Company will be exempt from
         the Securities Laws subject to the applicable "hold period" prescribed
         by the Securities Laws having elapsed;

         (n) the Company has received all necessary approvals to permit the
         issuance of the Purchased Shares to the Purchaser pursuant to the terms
         of this Agreement;

         (o) the Company has complied in all material respects with all
         Securities Laws, has filed all material change reports required to be
         filed under the Securities Laws and no confidential material change
         reports have been filed pursuant thereto and the Public Record does not
         contain any misrepresentation as such term is defined by the Securities
         Laws;

         (p) the Financial Information presents fairly the consolidated
         financial position of the Company as at the dates indicated and the
         results of its operations for the periods specified and the said
         Financial Information has been prepared in conformity with generally
         accepted accounting principles in Canada applied on a consistent basis;

         (q) the Diavik JV Agreement is in good standing, enforceable against
         the parties thereto in accordance with its terms and neither the
         Company nor any of its Subsidiaries is in default thereunder or has
         received any notice of non-compliance thereunder;

         (r) there is no restriction, including without limitation a requirement
         to obtain a License or an approval from an Authority but excluding any
         requirement to obtain a License or approval from an Authority to
         commence operations at the Diavik Mine, on the ability of the Company
         or its Subsidiaries to: (i) preserve the Company's Participating
         Interest (as


                                       12
<PAGE>   13
         such term is defined in the Diavik JV Agreement); (ii) take the
         Company's production from its Participating Interest (as such term is
         defined in the Diavik JV Agreement) in the Properties in kind,
         including without limitation, in diamonds; or (iii) dispose of, sell,
         polish, treat or market all of the Products (as defined in the Diavik
         JV Agreement) to which the Company is entitled pursuant to the Diavik
         JV Agreement;

         (s) to the Company's Knowledge, Diavik Diamond Mines Inc. is: (i) a
         subsidiary of Rio Tinto plc; and (ii) subject to the terms of the
         Diavik JV Agreement, has the exclusive right to deal with and dispose
         of the Properties;

         (t) pursuant to the Diavik JV Agreement, Diavik Diamond Mines Inc. is
         the Manager (as such term is defined in the Diavik JV Agreement), holds
         title to the Properties in trust for ADM in proportion to the ADM's
         Participating Interest (as such term is defined in the Diavik JV
         Agreement) and the Company has not received notice of its resignation
         pursuant to Section 7.4 of the Diavik JV Agreement;

         (u) the Company by itself or together with its Subsidiaries holds a 40%
         undivided Participating Interest (as such term is defined in the Diavik
         JV Agreement) in the portion of the Properties on which the Diavik Mine
         is to be located subject only to the royalty interests referenced in
         Section 6.1(v);

         (v) there are no royalties of any kind in respect of production from
         the Company's Participating Interest in the Properties except for the
         royalties disclosed in the schedules to the Diavik JV Agreement;

         (w) to the Company's knowledge, there are no aboriginal claims of any
         kind with respect to the Properties other than those listed in the
         Comprehensive Study Report dated June, 1999;

         (x) other than the Diavik JV Agreement and the agreements that are
         schedules thereto, there are no other material contracts of the Company
         or its Subsidiaries and copies of such material contracts have been
         provided to the Purchaser and its legal and financial advisers, and
         each of such materials contracts has not been breached by the Company
         or the Subsidiaries and is in good standing and enforceable against the
         Company and the Subsidiaries in accordance with its terms;

         (y) except as contemplated in the Diavik JV Agreement with respect to
         the Participants (as defined in the Diavik JV Agreement), no Person has
         any right to earn an interest of any kind in the Properties, to acquire
         one or more of the Properties or has any option to acquire one or more
         Properties or an interest in one or more Properties;

         (z) except for the Common Shares which are the subject of options
         granted pursuant to the Company's employee stock option plan and except
         for the securities of the Company and/or the Subsidiaries which may be
         pledged as


                                       13
<PAGE>   14
         security pursuant to the Section 9.4 of the Diavik JV Agreement,
         neither the securities of the Company or its Subsidiaries nor any
         interest in the Properties belonging to the Company or its Subsidiaries
         has been pledged as security or is subject of an option of any kind;

         (aa) to the Company's Knowledge: (i) each of the Company and the
         Subsidiaries is now complying and has at all times since February 1,
         1996 complied with all laws applicable to the Properties and the Diavik
         Mine, except where failure to so comply would not have a Material
         Adverse Effect; (ii) neither the Company nor any Subsidiaries has at
         any time since February 1, 1996 received notice that any of them are or
         have at any time since February 1, 1996 been, in violation of or in
         default in any material respect under, any License or any law
         applicable to any of them or to the Properties or the Diavik Mine
         except where any such violation or default would not have a Material
         Adverse Effect; and (iii) neither the Company, its Subsidiaries nor any
         party to the Diavik JV Agreement has given or received a notice issued
         pursuant to or in complying with Section 2.3(a) of the Diavik JV
         Agreement;

         (bb) the Common Shares are listed and posted for trading on The Toronto
         Stock Exchange;

         (cc) except for conditional approval of The Toronto Stock Exchange, no
         authorization, approval or consent of any court or governmental or
         regulatory authority is required to be obtained by the Company in
         connection with the sale and delivery of the Purchased Shares
         hereunder, except such as have been obtained;

         (dd) since January 31, 1999, there has been no change in the overall
         business, results of operations, prospects, assets, liabilities and
         condition (financial or otherwise) of the Company, its Subsidiaries or
         the Properties except as publicly disclosed pursuant to the Securities
         Laws which would have or reasonably be expected to have a Material
         Adverse Effect;

         (ee) each of the Company and its Subsidiaries has filed all required
         tax returns. All such tax returns were correct and complete in all
         material respects. All taxes due and owed by any of the Company and its
         subsidiaries have been paid, except where a delinquency in payment
         would not, individually or in the aggregate, have a Material Adverse
         Effect. The Company is not aware of any dispute or claim concerning any
         liability for taxes of the Company or any of its subsidiaries;

         (ff) except as disclosed in the Public Record, there is not now pending
         against the Company or any of the Subsidiaries or, to the knowledge of
         the Company, threatened against the Company or any of the Subsidiaries,
         nor has the Company or a Subsidiary received notice in respect of, any
         claim or potential claim which could lead to any Legal Proceeding that
         may seek to enjoin the transactions contemplated herein or that, if
         successful, could have, in the aggregate, a Material


                                       14
<PAGE>   15
         Adverse Effect;

         (gg) no broker, investment banker, financial advisor or other person,
         is entitled to any broker's, finder's, financial advisor's or other
         similar fee or commission in connection with the transactions
         contemplated by this Agreement or any of the other Operative
         Agreements;

         (hh) neither the Company nor a Subsidiary has conducted its business so
         as to cause, permit or suffer the violation of any Environmental Law in
         any material respect (including those requiring any Licenses), and has
         not transported, released, purchased or sold any Hazardous Substance in
         any material respect in violation of applicable Environmental Laws. No
         action or proceeding is pending or to the Knowledge of the Company
         threatened against the Company, a Subsidiary, the Properties or the
         Diavik Mine that involves any Environmental Law to any extent;

         (ii) the Company's assets exceed its liabilities and the Company is
         able to pay its obligations as they come due in the ordinary course of
         business;

         (jj) the corporate records of the Company and each Subsidiary are duly
         maintained in all material respects, in accordance with all applicable
         legal requirements and contain in all material respects, full and
         accurate records of all matters required to be dealt with in such
         records; and

         (kk) no representation or warranty contained in this Agreement, taken
         together with the statements contained in the Schedules to this
         Agreement and all written material provided to the Purchaser or to
         which the Purchaser was given access, contains any untrue statement of
         a material fact or omits to state a material fact necessary in order to
         make all such statements, in the light of the circumstances under which
         they were made, not misleading in any material respect.

6.2      Survival

         The representations and warranties of the Company contained in this 0
shall survive the execution and delivery of this Agreement and the Closing of
the transactions contemplated hereby for a period of three (3) years following
the Closing Date.

                                    Article 7
                 Representations and Warranties of THE PURCHASER

7.1      Representations and Warranties

         The Purchaser makes, as of the date hereof and the Closing date, the
following representations and warranties and acknowledges that the Company is
relying on such representations and warranties in entering into this Agreement:


                                       15
<PAGE>   16
         (a) it is a company duly incorporated and validly subsisting under the
         laws of its incorporation, with good and sufficient power, authority
         and right to enter into and deliver this Agreement and the Operative
         Agreements to which it is a party, and to complete the transactions to
         be completed by it contemplated in such agreements;

         (b) this Agreement and the transactions to be completed by the
         Purchaser hereunder have been duly authorized by all necessary
         corporate action on the part of the Purchaser and this Agreement has
         been duly executed and delivered by the Purchaser;

         (c) the execution and delivery of this Agreement, the Operative
         Agreements to which the Purchaser is a party, and the fulfillment of
         the terms hereof by the Purchaser do not and will not result in a
         breach of the certificate of incorporation, by-laws or resolutions of
         the Purchaser or any agreement or instrument to which the Purchaser is
         a party or by which it is contractually bound, which breach would
         materially adversely affect the Purchaser or the completion of the
         transactions contemplated hereby;

         (d) the Purchaser is purchasing the Purchased Shares as principal for
         its own account and not for the benefit of any other person;

         (e) the Purchased Shares are being acquired for the Purchaser's own
         account for investment only and not with a view to resale or
         distribution nor for the purposes of acquiring control of the Company
         either by itself or in concert with any other shareholder or
         shareholders;

         (f) neither the Purchaser nor any of its Affiliates currently own,
         directly or indirectly, any Common Shares and following the completion
         of the purchase and sale contemplated by Article 2 hereof, the
         Purchaser and its Affiliates will own, directly or indirectly, or
         exercise control or direction over, 8,000,000 Common Shares; and

         (g) the issue and sale of the Purchased Shares is exempt from the
         prospectus and registration statement requirements of applicable United
         States federal and state Securities Laws.

7.2      Survival

         The representations and warranties of the Purchaser contained in this
Article 7 shall survive the execution and delivery of this Agreement and the
Closing of the transactions contemplated hereby for a period of three (3) years
following the Closing Date.

                                    Article 8
                            Covenants of the Company


                                       16
<PAGE>   17
8.1      Covenants

         The Company covenants and agrees with the Purchaser that:

         (a) subject to receipt of the Purchase Price therefor, the Purchased
         Shares will at the Time of Closing be duly and validly issued to the
         Purchaser as fully-paid and non-assessable shares of the Company;

         (b) the Company shall cause the Board of Directors to authorize an
         increase in the size of the Board of Directors to nine (9) directors
         and shall appoint a nominee of the Purchaser to the Board of Directors
         immediately after the occurrence of the Company's meeting of
         shareholders scheduled to be held July 30, 1999;

         (c) so long as the Purchaser and its Affiliates own, directly or
         indirectly, not less than 8,000,000 outstanding Common Shares (as may
         be adjusted appropriately from time to time for share consolidations,
         stock splits, share reclassifications, capital reorganizations or
         similar transactions affecting either the designation or number of
         shares of the Company), there shall be nominated by the Company for
         election as directors of the Company at each meeting of shareholders at
         which directors are to be elected, one legally qualified individual
         nominated by the Purchaser;

         (d) if any director of the Company who was nominated by the Purchaser
         pursuant to Section 8.1(b) or Section 8.1(c) shall cease to be a
         director for any reason whatsoever, provided that the condition
         specified in Section 8.1(c) entitling the Purchaser to nominate one
         individual as its nominee continues to be satisfied at such time, a
         legally qualified individual designated by the Purchaser shall
         thereafter be nominated by the Company for election to, and in the
         event that the vacancy is to be filled by appointment by the Board of
         Directors rather than election by the shareholders, promptly appointed
         to, the Board of Directors;

         (e) the Company shall solicit proxies from its shareholders for such
         nominees to be voted in favour of the individual designated by the
         Purchaser in accordance with this Agreement;

         (f) the Company shall provide the nominee or nominees, as the case may
         be, to the Board of Directors with indemnities and directors' and
         officers' liability insurance coverage from the commencement of his or
         their appointment on the same basis as other directors;

         (g) the Company shall obtain the Purchaser's consent, not to be
         unreasonably withheld, to the timing, subject to applicable Securities
         Laws, of the dissemination and the form of the press release or other
         public announcement of the transactions contemplated in this Agreement;
         and

         (h) prior to the termination of the Rough Diamond Agreement, the
         Company


                                       17
<PAGE>   18
         shall not and shall not permit a Subsidiary to alter in any material
         respect, its arrangements under the Diavik JV Agreement, including by
         failing to make all contributions, payments and cash calls under the
         Diavik JV Agreement in order to maintain the Company's Participating
         Interest (as such term is defined in the Diavik JV Agreement) or
         relinquishing its Participating Interest (as defined in the Diavik JV
         Agreement) pursuant to Section 5.6 of the Diavik JV Agreement, except
         with the prior written consent of the Purchaser, not to be unreasonably
         withheld and not to be withheld if such proposed alteration does not
         adversely affect the ability of the Company or its Subsidiaries to
         supply to the Purchaser the Product (as defined in the Rough Diamond
         Agreement) in accordance with the requirements of the Rough Diamond
         Agreement, and provided that the Company shall consult the Purchaser in
         good faith with respect to any such proposed alteration which could
         reasonably be expected to result in an adverse affect to the ability of
         the Company or its Subsidiaries to supply to the Purchaser such Product
         in accordance with the Rough Diamond Agreement.

8.2      Survival

         The covenants of the Company contained in this Article 8 shall survive
the execution and delivery of this Agreement and the Closing of the transactions
contemplated hereby indefinitely.

                                    Article 9
                           Covenants OF THE PURCHASER

9.1      Covenants

         The Purchaser covenants and agrees with the Company as follows:

         (a)      the Purchaser will:

                  (i)      execute and deliver all such documentation as may be
                           required by applicable Securities Laws, including the
                           TSE Questionnaire; and

                  (ii)     sell the Purchased Shares only in compliance with
                           applicable Securities Laws;

         (b) the Purchaser shall not and shall not permit any of its Affiliates
to sell or otherwise dispose of any Common Shares prior to the second
anniversary of the last day of the first month of commercial production from the
Diavik Mine except: (i) in acceptance of a take-over bid made by circular by a
third party at arm's-length to the Purchaser in accordance with the requirements
of the Securities Laws; (ii) in participating in a merger, amalgamation or
similar transaction involving the Company which has received the approval of the
Board of Directors; or (iii) otherwise in accordance with the following
provisions of this Section 9.1(b). In the event that the Purchaser wishes to
sell or cause to be sold any Common Shares owned, directly or indirectly, by it
or its Affiliates, it shall first give to the Company not less than 90 and not
more than 120 days' written notice (the "Sale Notice") of such proposed sale,
specifying the number of


                                       18
<PAGE>   19
Common Shares (the "Subject Shares") it wishes to sell, the date on which it
proposes to effect such sale (the "Sale Date") and the proposed purchaser, if
any. Upon receipt of a Sale Notice, the Company shall be permitted during the
period up to 5:00 p.m. (Toronto local time) on the third business day (the
"Designation Deadline") prior to the Sale Date to designate a purchaser (the
"Designated Purchaser") of the Subject Shares by written notice to the Purchaser
in which event the Purchaser shall sell the Subject Shares to the Designated
Purchaser on the Sale Date for a cash purchase price per Subject Share (the
"Market Price") equal to the simple average closing trading price of the Common
Shares on The Toronto Stock Exchange (or other principal trading market if the
Common Shares are not then so listed) for the 20 trading days immediately
preceding the Designation Deadline (appropriately adjusted to reflect any stock
split or consolidation occurring during such 20 trading day period). In the
event the Company fails to give notice of a Designated Purchaser prior to the
Designation Deadline, the Purchaser shall be free to effect a sale of the
Subject Shares, or any of them, on the Sale Date and for a period of 30 days
thereafter at a price per Subject Share which is not less than the Market Price;
and

         (c) the Purchaser shall obtain the Company's consent, not to be
unreasonably withheld, to the timing, subject to applicable Securities Laws, of
the dissemination and the form of the press release or other public announcement
of the transactions contemplated in this Agreement.

9.2      Survival

         The covenants of the Purchaser contained in this Article 9 shall
survive the execution and delivery of this Agreement and the Closing of the
transactions contemplated hereby indefinitely.

                                   Article 10
                                 INDEMNIFICATION

10.1     Indemnification by the Company

         The Company covenants and agrees with the Purchaser to indemnify and
save harmless the Purchaser from and against any claims, demand, Legal
Proceeding, action, cause of action, damage, loss (excluding loss of profits),
costs, liability or expense (including professional fees and disbursements)
which may be made or brought against the Purchaser or which it may suffer or
incur, directly or indirectly, in respect of, as a result of, or arising out of:
(a) any non-fulfillment of any covenant or agreement on the part of the Company
under this Agreement; or (b) any inaccuracy in or breach of any of the Company's
representations or warranties contained in this Agreement or any document or
certificate given pursuant to this Agreement.

10.2     Indemnification by the Purchaser

         The Purchaser covenants and agrees with the Company to indemnify and
save harmless the Company from and against any claim, demand, Legal Proceeding,
action, cause of action, damage, loss (excluding loss of profits), costs,
liability or expense (including professional fees and disbursements) which may
be made or brought against the Company or which it may suffer or incur, directly
or indirectly, in respect of, as a result of, or arising out of: (a) any
non-


                                       19
<PAGE>   20
fulfillment of any covenant or agreement on the part of the Purchaser under this
Agreement; or (b) any inaccuracy in or breach of any of the Purchaser's
representations or warranties contained in this Agreement or any document or
certificate given pursuant to this Agreement.

10.3     Procedure for Indemnification

         (a) Claims Other Than Third Party Claims. Following receipt from the
         Company or the Purchaser, as the case may be (the "Indemnified Party"),
         of a written notice of a claim for indemnification which has not arisen
         in respect of a Third Party Claim (as defined in Section 10.3(b)
         below), the party who is in receipt of such notice (the "Indemnifying
         Party") shall have 30 days to make such investigation of the claim as
         the Indemnifying Party considers necessary or desirable. For the
         purpose of such investigation, the Indemnified Party shall make
         available to the Indemnifying Party the information relied upon by the
         Indemnified Party to substantiate the claim. If the Indemnified Party
         and the Indemnifying Party agree at or prior to the expiration of such
         30 day period (or any mutually agreed upon extension thereof) to the
         validity and amount of the claim, the Indemnifying Party shall
         immediately pay to the Indemnified Party the full agreed upon amount of
         the claim. If the Indemnified Party and the Indemnifying Party do not
         agree within such period (or any mutually agreed upon extension
         thereof), such dispute shall be resolved by arbitration as set out in
         Section 13.10.

         (b) Third Party Claims. The Indemnified Party shall notify the
         Indemnifying Party in writing as soon as is reasonably practicable
         after being informed in writing that facts exist which may result in a
         claim originating from a Person other than the Indemnified Party (a
         "Third Party Claim") and in respect of which a right of indemnification
         given pursuant to Section 10.1 or 10.2 may apply. The Indemnifying
         Party shall have the right to elect, by written notice delivered to the
         Indemnified Party within 10 days of receipt by the Indemnifying Party
         of the notice from the Indemnified Party in respect of the Third Party
         Claim, at the sole expense of the Indemnifying Party, to participate in
         or assume control of the negotiation, settlement or defence of the
         Third Party Claim, provided that:

                  (i)      such will be done at all times in a diligent and bona
                           fide matter;

                  (ii)     the Indemnifying Party acknowledges in writing its
                           obligation to indemnify the Indemnified Party in
                           accordance with the terms contained in this Agreement
                           in respect of that Third Party Claim; and

                  (iii)    the Indemnifying Party shall pay all reasonable
                           out-of-pocket expenses incurred by the Indemnified
                           Party as a result of such participation or
                           assumption.

If the Indemnifying Party elects to assume such control, the Indemnified Party
shall co-operate with the Indemnifying Party and its counsel and shall have the
right to participate in the


                                       20
<PAGE>   21
negotiation, settlement or defence of such Third Party Claim at its own expense.
If the Indemnifying Party does not so elect or, having elected to assume such
control, thereafter fails to proceed with the settlement or defence of any such
Third Party Claim, the Indemnified Party shall be entitled to assume such
control. In such case, the Indemnifying Party shall co-operate where necessary
with the Indemnified Party and its counsel in connection with such Third Party
Claim and the Indemnifying Party shall be bound by the results obtained by the
Indemnified Party with respect to such Third Party Claim.

10.4     Additional Rules and Procedures

         The obligation of the parties to indemnify each other pursuant to this
Article 10 shall also be subject to the following:

         (a)      an Indemnified Party shall only be entitled to make a claim
                  for indemnification pursuant to Section 10.1 or 10.2, as the
                  case be, if written notice containing reasonable particulars
                  of such claim is delivered to the Indemnifying Party (within
                  the time periods provided for in Section 10.3(a) or Section
                  10.3(b), as the case may be);

         (b)      if any Third Party Claim is of a nature such that the
                  Indemnified Party is required by applicable law to make a
                  payment to any Person (a "Third Party") with respect to such
                  Third Party Claim before the completion of settlement
                  negotiations or related legal proceedings, the Indemnified
                  Party may make such payment and the Indemnifying Party shall,
                  forthwith after demand by the Indemnified Party, reimburse the
                  Indemnified Party for any such payment. If the amount of any
                  liability under the Third Party Claim in respect of which such
                  a payment was made, as finally determined, is less than the
                  amount which was paid by the Indemnifying Party to the
                  Indemnified Party, the Indemnified Party shall, forthwith
                  after receipt of the difference from the Third Party, pay such
                  difference to the Indemnifying Party;

         (c)      the Indemnifying Party shall, if it is providing full
                  indemnification in respect thereof and subject to obtaining a
                  full and final release of such Third Party Claims in favour of
                  the Indemnified Party, be permitted to settle and compromise
                  any Third Party Claim; and

         (d)      following notice of a Third Party Claim with respect to such
                  Third Party Claim, the Indemnifying Party and the Indemnified
                  Party shall provide each other on an ongoing basis with all
                  information which may be relevant to the other's liability
                  under the provisions of this Article 10 and shall supply
                  copies of all relevant documentation promptly as they become
                  available.


10.5     Rights Cumulative

         The rights of indemnification contained in this Article 10 are
cumulative and are in


                                       21
<PAGE>   22
addition to every other right or remedy of the parties contained in this
Agreement or otherwise.

10.6     GST

         If the Company and the Purchaser acting reasonably determine that any
payment (the "Payment") made pursuant to this Article 10 is subject to GST or is
deemed by the ETA to be inclusive of GST, the Indemnifying Party agrees to pay
to the Indemnified Party in addition to the Payment an amount equal to the
Payment multiplied by the applicable rate of GST.

                                   Article 11
                                 CONFIDENTIALITY

11.1     Confidentiality Agreement

         At the Time of Closing, the Purchaser shall execute and deliver in
favour of the Company the Confidentiality Agreement.

                                   Article 12
                                     General

12.1     Assignment

         Neither of the parties may assign any right, benefit or interest in
this Agreement without the written consent of the other, and any purported
assignment without such consent will be void.

12.2     Entire Agreement

         This Agreement constitutes the entire agreement between the parties and
supersedes every previous agreement, communication, expectation, negotiation,
representation, warranty or understanding whether oral or written, express or
implied, statutory or otherwise, between the parties with respect to the subject
matter of this Agreement.

12.3     Severability

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

12.4     Time of the Essence

         Time is expressly declared to be of the essence of this Agreement. Any
extension of time hereunder shall not be deemed to be or to operate in law as a
waiver on the part of that party granting the extension that time is no longer
of the essence.

12.5     Further Acts

         Each party will execute and deliver such further agreements and
documents and do such


                                       22
<PAGE>   23
further acts and things as any other party hereto reasonably requests to
evidence, carry out or give full force and effect to the intent of this
Agreement.

12.6     Governing Law

         This Agreement is and will be deemed to have been made in British
Columbia, Canada, and for all purposes will be governed exclusively by and
construed and enforced in accordance with the laws prevailing in British
Columbia and the rights and remedies of the parties will be determined in
accordance with those laws.

12.7     Enurement

         This Agreement will inure to the benefit of and be binding upon the
respective legal representatives and successors and permitted assigns of the
parties.

12.8     Counterparts and Facsimile Copies

         This Agreement may be executed in any number of counterparts and by
facsimile copies with the same effect as if all parties to this Agreement had
signed the same document and all counterparts and facsimile copies will be
construed together and will constitute one and the same instrument.

12.9     Notices

         All payments and communications which may be or are required to be
given by any party to any other party, shall be in writing and (i) delivered
personally, (ii) sent by prepaid courier service or mail, or (iii) sent by
prepaid telecopier or other similar means of electronic communication to the
parties at their following respective addresses:

         For the Purchaser:

                  727 Fifth Avenue
                  New York, New York  10022
                  U.S.A.
                  Attention:      Office of the General Counsel
                  Telecopier:     (212) 605-4177

         with a copy to:

                  Goodman Phillips & Vineberg
                  Barristers & Solicitors
                  250 Yonge Street, Suite 2400
                  Toronto, Canada  M5B 2M6
                  Attention:      Stephen Halperin
                  Telecopier:     (416) 979-1234

         and to:


                                       23
<PAGE>   24
                  Gibson, Dunn & Crutcher LLP
                  200 Park Avenue
                  New York, New York
                  10166-0193
                  Attention:      Steven Finley
                  Telecopier:     (212) 351-4035

         For the Company:

                  Suite 930-355 Burrard Street
                  Vancouver, British Columbia
                  V6C 2G8
                  Attention:      Kenneth G. Hanna
                                  President and Chief Executive Officer
                  Telecopier:     (604) 685-8359

         with a copy to:

                  Stikeman, Elliott
                  Commerce Court West
                  Suite 5300
                  Toronto, Canada M5L 1B9
                  Attention:      Robert Nicholls
                  Telecopier:     (416) 947-0866

Any such notice so given shall be deemed conclusively to have been given and
received when so personally delivered or delivered by courier or on the day on
which termination is confirmed if sent by telecopier or other electronic
communication or on the fifth day following the sending thereof by mail. Any
party may from time to time change its address hereinbefore set forth by notice
to the other parties in accordance with this section.

12.10    Service

         If any party is or becomes a party on which service or legal process
with respect to an action commenced in the Province of British Columbia must be
served out of the jurisdiction of the Province of British Columbia (an "Ex-Juris
Party"), the Ex-Juris Party shall in writing to the other parties designate,
appoint and empower a party or agent within the Province of British Columbia to
receive for and on behalf of the Ex-Juris Party service of process in the
Province of British Columbia in any legal action or proceeding with respect to
this Agreement, which agent shall undertake to enter an unconditional appearance
within 30 days after the date of such service. A copy of such process served on
the agent will be promptly forwarded by mail by the party initiating such
proceeding to the Ex-Juris Party at the address referred to in the next
sentence. Failure of the Ex-juris Party to receive such copy shall not affect in
any way the service of such process on the Ex-juris Party by service upon its
agent for service as designated above. Each party agrees that if it becomes a
Ex-juris Party and it fails to maintain such a duly


                                       24
<PAGE>   25
appointed agent for service of process, it irrevocably consents to the service
of process out of any Court of the Province of British Columbia by mailing all
copies of such process by registered or certified mail, postage pre-paid to the
last address designated for delivery of notice to such Ex-juris Party under the
terms of Section 12.9, such service to be effective second Business Day after
the date of such mailing. The mailing to such Ex-Juris Party at such address
shall be deemed personal service and acceptance of service by such Ex-juris
Party for any action or proceeding with respect to any matter relating to this
Agreement. Service in accordance with the foregoing provisions shall not
preclude any other manner of service permitted by the laws of the Province of
British Columbia.

12.11    Currency

         Except as otherwise expressly provided in this Agreement, all dollar
amounts referred to in this Agreement are stated in the lawful currency of
Canada.


                                       25
<PAGE>   26
         IN WITNESS WHEREOF the parties hereto have hereunto duly executed this
Agreement on the date first above written.

                           TIFFANY & CO. INTERNATIONAL

                           Per: /s/ Michael J. Kowalski
                                ------------------------------------------------
                                Authorized Signing Officer


                           ABER RESOURCES LTD.

                           Per: /s/ Kenneth G. Hanna
                                ------------------------------------------------
                                Authorized Signing Officer


                                       26


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