The Montana operations consist of the Stillwater Mine, East Boulder Mine, and the Metallurgical Complex, where we extract and ... process platinum group metals (PGM) from the J-M Reef. This is the only known significant source of PGMs in the United States and the highest-grade PGM deposit known in the world. These operations primarily produce palladium (78%) and platinum (22%). The mines have been operating for over 35 years and are well-positioned to continue their strong operations for decades to come. The nearby Columbus, Montana, Metallurgical Complex smelts mined material to produce PGM-rich filter cake and recycles autocatalysts to recover PGMs. read more