Stillwater Mining Company engages in developing, extracting, processing, smelting, refining, and marketing palladium, platinum, and associated metals (PGMs). It also explores for nickel, copper, gold, and silver ores. The company conducts its mining operations at the Stillwater mine, which is located near Nye, Montana; and at the East Boulder mine located in Sweet Grass County, Montana. It is also involved in developing Marathon, a PGM-copper project located in Ontario, Canada; and exploring Altar, a copper-gold project, which includes 8 wholly-owned mining concessions covering 7,771 hectares, 5 optioned mining concessions covering 3,705 hectares, and 1 staked mineral concession comprising 469 hectares in San Juan, Argentina. In addition, the company operates a smelter and base metal refinery located in Columbus, Montana. Further, it recycles spent catalyst material to recover palladium, platinum, and rhodium at its smelter and base metal refinery. As of December 31, 2012, the company had proven and probable ore reserves of approximately 46.1 million tons at its Montana operations. Stillwater Mining Company was founded in 1992 and is based in Billings, Montana.

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