Mission Complex

Telephone: 520-648-2500 Fax: 520-625-9632

Address:4201 West Pima Mine Road, Sahuarita, AZ 85629

R.R. Connections: Union Pacific Railroad (UPRR)

Location: 18 miles south of Tucson, Arizona in Pima County, Arizona.

Operations: The Mission Complex, an open-pit mine composed of the Mission, Eisenhower, Pima, Mineral Hill and South San Xavier properties and the nearby North San Xavier mine.

The Mission mine produced 27,700 tons of copper and 540,043 ounces of silver in 2003.

Size: The current pit, 2.5 miles long by 1.5 mile wide and 1,200 feet deep, is situated on 20,000 acres. Benches are 40 feet high.

Plant facilities: The Complex currently is operating one mill with crushing, grinding and flotation facilities, warehouse, maintenance and administrative areas. A second mill is under care and maintenance.

Products: Copper, concentrate containing copper and silver

Employees: 188 (145 Hourly, 43 Salary)

Management:

John D. Low, General Manager
Mark J. Kalmi, Mine Manager
Samuel D. Lawrence, Mill Manager
James F. Coxon, Human Resources Manager
Hal T. Richins, Engineering Manager
Al Cooper, Sr. Environmental Engineer
Robert Jordan, Safety Administrator

History:

1959 - Pre-mine development.
1961 - Mill began operating at 15,000 tons per day.
1967 - Two additional rod mills and one flotation section added to bring capacity to 22,000 tons per day.
1976 - Partnership formed with Anamax Mining Company to mine Eisenhower property between Mission pit and South San Xavier Pit.
1979 - Production commenced from Eisenhower.
1980 - Flotation cells upgraded
1985 - Pima mine, contiguous to Mission, acquired.
1987 - Refinements increased mill capacity to 28,000 tons per day Eisenhower acquired by Asarco from Anamax.
1989 - Pima Mill acquired
1991 - Refurbishing and new construction of (Pima Mill) Mission South Mill.
1993 - Expansion of Mission Mine completed Flotation Cell Modification.
1995 - Secondary crusher modifications and DCS installed in Mission Mill. Increases capacity to 43,000 (Total 63,000 with 20,000 from South Mill).
1996 - Underground mine expansion.
1997 - Underground mine expansion; Overland conveyor installed to move non-mineral rock.
1999 - Mission Mill Secondary Crusher Upgraded.
2000 - Mission Mill throughput reduced to 41,000 tons per day.
2001 - Mission Mill throughput reduced to 31,000 tons per day, South Mill placed under care and maintance.
2002 - Mission Mill throughput reduced to 24,000 tons per day.
2003 - Mission Mill throughput reduced to 17,000 tons per day. Underground mine closed.
2006 - Restart of Molybdenum Circuit.