1970

1970

1970 150 150 admin

1971

Four Tennessee zinc mines purchased.

1973

San Xavier copper mine and leach plant
in Arizona started production

1974

ASARCO Mexicana, S.A. reorganized as
Industrial Minera Mexico, S.A. and 15%
interest sold to Mexican investors reducing
equity to 34%.

1975

Corporate name changed to ASARCO
Incorporated.
Amarillo zinc refinery closed.
Amarillo copper refinery commenced
production.

1976

Southern Peru Copper Corporation opened
Cuajone copper mine.

1978

Industrial Minera Mexico, S.A. (IMM) reorganized.
ASARCO owns 34% of Mexico Desarrollo Industrial
Minero, S.A., a holding company formed to
hold shares of IMM and shares of certain IMM
operating subsidiaries.

1979

Modernization of El Paso Plant completed.
Eisenhower Mining Company, a partnership
of Anamax and ASARCO, began mining the
Palo Verde copper deposit located between
ASARCO’s Mission and San Xavier copper mines