ABOUT US MINES MISSIONSILVER BELLRAYAMARILLO REFINERY 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 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. 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 tobring capacity to 22,000 tons per day. 1976 Partnership formed with Anamax Mining Company to mine the 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 dayEisenhower acquired by ASARCO from Anamax. 1989 Pima Mill acquired. 1991 Refurbishing and new construction of (Pima Mill) Mission SouthMill. 1993 Expansion of Mission Mine completed Flotation CellModification. 1995 Secondary crusher modifications and DCS installed in MissionMill. 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 movenon-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, SouthMill placed under care and maintenance. 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. 2009 Pumping system installed to utilize CAP water. 2011 Reclamation of Tailings Dams 1-3 and the Mission North Dump. 2011 Mine utilizes biosolids from Pima County Green Valley Wastwater treatment plant. 2013 South Mill Expansion Completed. GRUPO MEXICO CAREERS SUPPLIER PORTAL

SUSTAINABILITY SUSTAINABILITY Acting in a responsible and transparent manner in the social, economic and environmental fields is essential to guarantee a sustainable development. In Grupo Mexico we are committed to the United Nations’ Sustainable Development Goals and the Global Compact principles. Caring for the environment, tackling climate change and respecting human rights are at the center of our sustainability strategy. WE STRIVE TO CONTINUOUSLY IMPROVE OUR PERFORMANCE. SUSTAINABILITY AT ASARCO LEARN MORE SAFETY AT ASARCO LEARN MORE GRUPO MEXICO CAREERS SUPPLIER PORTAL