[LOGOS OF CYPRUS AMAX MINERALS COMPANY AND ASARCO APPEAR HERE]              NEWS

                                                           FOR IMMEDIATE RELEASE

             CYPRUS AMAX MINERALS COMPANY AND ASARCO INCORPORATED
                           ANNOUNCE MERGER OF EQUALS

               --Strategic Combination Creates Largest Publicly
                     Traded Copper Company in the World--

          --New Company to Realize $150 Million in Annual Synergies--

    DENVER, CO and NEW YORK, N.Y., July 15, 1999 -- Cyprus Amax Minerals
Company (NYSE:CYM) and ASARCO Incorporated (NYSE:AR) today announced an
agreement, unanimously approved by the Boards of both companies, for the
combination of the two companies in a merger-of-equals transaction. The new
Company, which will be named Asarco Cyprus Incorporated, will be the largest
publicly traded copper company.
    Under the terms of the transaction, Cyprus Amax shareholders will receive
0.765 shares of Asarco Cyprus common stock for each share of Cyprus Amax common
stock they own and Asarco shareholders will receive one share of Asarco Cyprus
common stock for each share of Asarco common stock they own. The exchange of
shares for both companies' shareholders is expected to be tax-free. An initial
dividend rate of 5 cents per share per quarter, the same dividend rate paid
currently by Cyprus Amax and Asarco, is expected.
    Asarco Cyprus will have its corporate headquarters in New York City and its
operations headquarters in Tempe, Arizona. The combined company will have a
beneficial interest in annual copper production of approximately 2.0 billion
pounds, second only in size to the Chilean government-owned copper company,
Codelco. Asarco Cyprus will have the financial capacity and resources necessary
to further develop and expand its low-cost copper properties. The new Company's
annual after-tax earnings sensitivity will be approximately 14 cents per share
for every one cent change in the price of copper.
    The merger is expected to reduce the combined expenses of Cyprus Amax and
Asarco by approximately $150 million annually. The expense reductions will be
realized in corporate overhead, administrative costs, material and supply costs
and from operating synergies.


                          FOR FURTHER INFORMATION:
         John Taraba (303) 643-5244     Gerald J. Malys (303) 643-5060
             Jerry W. Cooper (212) 510-1810 (212) 510-1835 (FAX)
                        Donald M. Noyes (212) 510-1813



Depreciation expense will also be reduced. When the expense reductions are fully
implemented by 2001, the new Company's cash cost of producing copper is expected
to be approximately 50 cents per pound. At that point, Asarco Cyprus expects
that it will require a copper price of only 65 cents per pound to break even on
a net earnings basis. As a result of the expense reductions, the transaction
will be accretive to earnings for both companies in 2000.
    Asarco Cyprus will have a 16-person Board of Directors with eight members
nominated by Cyprus Amax and eight nominated by Asarco. Milton H. Ward, Cyprus
Amax's chairman, president and chief executive officer, and Francis R.
McAllister, Asarco's chairman and chief executive officer, will serve as co-
chief executive officers and directors of Asarco Cyprus. Mr. Ward will be
chairman and co-CEO through April 2000 and, following April 2000, will be
chairman until his retirement at the end of 2000. Mr. Ward will remain a
director of the new company following his retirement. Mr. McAllister will be
president and co-CEO through April 2000, president and chief executive officer
until the end of 2000 and will become chairman, president and chief executive
officer at the end of 2000.
    Ward, chairman, president and chief executive officer of Cyprus Amax, and
McAllister, chairman and chief executive officer of ASARCO Incorporated, said,
"We are very excited about the new Company we are creating. We believe that
copper has very strong growth potential. This strategic combination results in a
company with large copper and molybdenum ore reserves, the financial capacity to
develop, enhance and expand our copper assets and the ability to meet the
challenges of low copper prices and to generate substantial cash flow during
periods of strong copper prices.
    "We plan to build on the strengths of both companies by rationalizing
operations, enhancing operating efficiencies, leveraging purchasing power and
devoting resources to low-cost copper production. Shareholders, employees,
customers and the communities of which we are part will all benefit from the
combination of our companies.
    "Our operations are highly complementary. Our U.S. mines, which are
primarily in Arizona, are in close proximity to one another, providing the
opportunity to achieve operating efficiencies and reduce administrative
overhead. Our mines in Peru and Chile have similar potential for operating
efficiencies. The new Company will have substantially greater financial
capacity, lower costs and more efficient operating dynamics. It is a combination
which we believe will lead to significant long-term value for our shareholders."
    Asarco Cyprus' beneficial interest in copper ore reserves will be
approximately 62 billion pounds of contained copper with excellent potential for
further expansion.



    Asarco Cyprus will also be the world's largest producer of molybdenum, a
major producer of specialty chemicals, a regional producer of aggregates and the
owner of a 30% interest in Kinross Gold Corporation.
    On a pro forma basis, the new company will have cash of approximately $1.4
billion, total assets of approximately $8.0 billion and equity market
capitalization of approximately $2.0 billion.
    Jeffrey G. Clevenger, currently executive vice president of Cyprus Amax and
president of Cyprus Climax Metals Company, will be executive vice president and
chief operating officer of Asarco Cyprus and will have responsibility for Asarco
Cyprus' copper and molybdenum businesses. Kevin R. Morano, currently president
and chief operating officer of Asarco, will be executive vice president and
chief financial officer of Asarco Cyprus and will have responsibility for Asarco
Cyprus' finance and administration functions and for its non-copper businesses.
Both Mr. Clevenger and Mr. Morano will be directors of Asarco Cyprus. Southern
Peru Copper Corporation (NYSE:PCU), 54.3% owned by Asarco, whose president and
chief executive officer, Charles B. Smith, is based in Lima, Peru, will continue
to report directly to Mr. McAllister, who will continue to be chairman of
Southern Peru Copper Corporation.
    The combination, which is subject to regulatory approvals and the approvals
of the shareholders of both Cyprus Amax and Asarco, is expected to close in the
4th Quarter of 1999. Merrill Lynch & Co. acted as financial advisor to Cyprus
Amax and Credit Suisse First Boston acted as financial advisor to Asarco.
    Cyprus Amax is a leading producer of copper, the world's largest producer of
molybdenum, and holds a 30% interest in Kinross Gold Corporation. Cyprus Amax is
exploring for minerals worldwide.
    Asarco is one of the world's leading producers of copper, specialty
chemicals and aggregates.
    Actual results may vary materially from any forward-looking statement the
Companies make. Refer to the Cautionary Statement and Risk Factors contained in
Cyprus Amax's and Asarco's 1998 Form 10-Ks.

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