Excelsior Mining Corp. (TSX: MIN, OTCQX: EXMGF) Excelsior "The Copper Solution Company" is a mineral exploration and production company that owns the Gunnison Copper Project in Cochise County, Arizona. The project is a low cost, environmentally friendly in-situ recovery copper extraction project that is permitted to 125 million pounds per year of copper cathode production. The Feasibility Study projected an after-tax NPV of US$807 million and an IRR of 40% using a US$ 2.75 per pound copper price and a 7.5% discount rate.