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Excelsior Mining Corp. is developing the world’s largest low-cost in-situ copper project within the copper porphyry belt of Arizona. Based on an initial production rate of 110Mlb/year and a US$2.75/lb copper price, the prefeasibility study indicates an after-tax NPV7.5 of US$826M, an IRR of 44.7% and a payback period of just 2.4 years. Total initial capital expenditures are estimated at US$284.84M with an average life-of-mine direct operating cost of just US$0.69/lb. These metrics are amongst the lowest per pound capital and operating costs for copper projects in the world.