Right idea, right place, right timeKeith Regan learns how PolyMet Mining plans to refurbish the large processing facilities and add new modern technology to help meet worldwide demand for a range of metals such as copper, nickel, cobalt, platinum, palladium and gold. Mining has long been a part of the economy, landscape and culture of the Mesabi Range area of northeastern Minnesota, with six iron ore mines remaining in active production today. Historically, the mining activity has been focused on iron ore. PolyMet Mining Corp.