Commenting open: June 17, 2025 02:41PM MT - July 28, 2025 05:00PM MT.
DP-166, Open Pits, SX/EW Plant, 2 Leach Stockpile, Valencia In-Pit Leach Stockpile, In-Pit Waste Rock Stockpiles: Freeport-McMoRan Tyrone Inc. proposes to renew the Discharge Permit for the discharge of up to 49,000,000 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 10 miles southwest of Silver City at the Tyrone Mine in Sections 23, 24 & 25, Township 9 South, Range 5 West and Sections 14, 15, 21, 22, 23, 26, 27 and 28, Township 9 South, Range 5 West, Grant County, New Mexico. Groundwater most likely to be affected ranges in depth from approximately ground surface to 350 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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