Stillwater Mining Co.

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FILE - This May 2, 2013 file photo shows the Stillwater Mining Co. complex, the only platinum and palladium mine in the United States, near Nye, Mont. South Africa's Sibanye Gold Limited completed its $2.2 billion purchase of Littleton, Colorado-based Stillwater on Thursday, May 4, 2017, positioning it as the world's fourth-largest producer of precious metals. (AP Photo/Matthew Brown, File)