Commenting open: October 23, 2025 04:55PM MT - December 01, 2025 05:00PM MT.
DP-435, Tyrone Mine, 2A Leach Stockpile; 2B Leach Stockpile; 9A and 9AX Waste Rock Stockpiles: Freeport-McMoRan Tyrone Inc. proposes to renew the Discharge Permit for the discharge of up to 17,280,000 gallons per day of acidic leach solution applied for leaching copper from a stockpile. Potential contaminants from this type of discharge include total dissolved solids, sulfate, and metals. The facility is located 12 miles southwest of Silver City at the Tyrone Mine in Sections 14, 15, 16, 21 and 22, Township 19 South, Range 15 West, Grant County. Groundwater most likely to be affected ranges in depth from approximately 0 to 350 feet and had a pre-discharge total dissolved solids concentration ranging from 100 to 280 milligrams per liter
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