PolyMet Mining Corp., through its subsidiary, Poly Met Mining, Inc., engages in the exploration and development of natural resource properties. Its primary mineral property is the NorthMet project, a polymetallic project that hosts copper, nickel, cobalt, platinum, palladium, gold, and silver mineralization covering an area of approximately 5,980 acres located in northeastern Minnesota, the United States. The company was formerly known as Fleck Resources Ltd. and changed its name to PolyMet Mining Corp. in June 1998. PolyMet Mining Corp. was incorporated in 1981 and is headquartered in Saint Paul, Minnesota. PolyMet Mining Corp. operates as a subsidiary of Glencore AG.