Commenting open: February 16, 2026 02:25PM MT - March 30, 2026 05:00PM MT.
DP-526, Freeport-McMoRan Chino Mines Company, Randy B. Ellison, General Manager, proposes to renew and modify the existing Whitewater Leach System Discharge Permit for the discharge of up to 24,500,000 gallons per day of acidic leach solution (raffinate) applied for leaching copper from two stockpiles. The modification consists of incorporating the Ivanhoe Mill and Concentrator area previously permitted under DP-213. Potential contaminants from this type of discharge include total dissolved solids, sulfate, and metals. The facility is located 2 miles northeast of Bayard in Sections 28, 29, 32, 33, and 34, Township 17 South, Range 12 West; and Sections 3, 4, and 5, Township 18 South, Range 12 West, Grant County. Groundwater beneath the site is at a depth of approximately 0-300 feet and had a pre-discharge total dissolved solids concentration range from approximately 266-1,000 milligrams per liter.
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