1983
Hayden copper smelter modernization
completed.
1985
Corpus Christi zinc smelter and refinery operations suspended indefinitely. Pima copper mine in Arizona acquired.
1986
Ray copper mine and smelter purchased.
1987
Anamax interest in Eisenhower mineral reserves acquired.
1988
Encycle, Inc. started up waste treatment facility at Corpus Christi.
1989
IMASA Group acquired. 49.9% interest acquired in copper mining business of Montana Resources, Inc. ASARCO announces decision to end involvement
in coal mining. ASARCO announces board approval to expand copper facilities at Mission and Ray mines and El Paso smelter.