Commenting open: January 14, 2026 03:28PM MT - February 23, 2026 05:00PM MT.
DP-363; No. 1A & 1B Leach Stockpiles and East-Side Leakage Detection System: Freeport-McMoRan Tyrone Mine Inc. proposes to renew the discharge permit for the discharge of up to 16,488,000 gallons per day of acidic leach solution applied for leaching copper from a stockpile. In addition, DP-363 includes pregnant leach solution collection facilities, stormwater control structures, and associated facilities. Potential contaminants from this type of discharge include total dissolved solids, sulfate, and metals. The facility is located 10 miles southwest of Silver City at the Tyrone Mine in Sections 23, 24 & 25, Township 19 South, Range 15 West, and Sections 19, 28, 29, 30, 33, and 34, Township 19 South, Range 14 West, Grant County, New Mexico. Groundwater most likely to be affected ranges in depth from approximately 10 to 90 feet below ground surface and had a pre-discharge total dissolved solids concentration ranging from approximately 100 to 500 milligrams per liter.
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