PolyMet Mining Corp. is a mine development company. The Company is engaged in mining copper, nickel and precious metals from the NorthMet ore body. The Company owns the NorthMet Project and Mesaba Project, which is a copper, nickel, cobalt and platinum group metal (PGM) deposits. The NorthMet deposit is located in the Partridge River Intrusion of the Duluth Complex, a geological formation near the eastern end of the Mesabi Iron Range, which is an undeveloped accumulation of copper, nickel and platinum group metals. The Mesaba Project is located in St. Louis County, Minnesota. Its NorthMet is a disseminated sulfide deposit in heterogeneous troctolitic rocks associated with Mid-continent Rift, and is rich with copper, nickel, cobalt, platinum, palladium, gold and silver. The majority of the metals are concentrated in, or associated with, four sulfide minerals: chalcopyrite, cubanite, pentlandite and pyrrhotite.