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Reactivity in the south spoils and hillside dump at the Midnite Mine.
Moore-BW; Price-JW; Gardner-T
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609, 1996 Jan; :1-227
The Midnite Mine is an interactive open-pit uranium mine located on the Spokane Indian Reservation in Washington State. Drill samples from two large waste rock dumps on the site, known as South Spoils and Hillside Dump, were collected with a Becker hammer drill and evaluated to determine potential of the rock to generate acid mine drainage (AMD). Waste rock at this mine contains both pyrite and uranium, and AMD effects are more complicated on this site than most in that uranium is soluble in both acidic and neutral aqueous solutions. Considerable calcite exists in the South Spoils, and weathering feldspars further contribute to acid neutralization. The Hillside Dump has low concentrations of pyrite and calcite that acid-base accounting protocols would predict to be non-acidic.
Abandoned-sites; Acid-drainage; Acid-neutralizing-capacity; Chemical-analysis; Chemical-reactions; Drilling; Metals; Neutralization; Pyrite; Radionuclide-migration; Rock-fluid-interactions; Sampling; Silicates; Solubility; Spoil; Tailings; Uranium-isotopes; Uranium-mines; Sampling; Sampling-methods
Report of Investigations
NTIS Accession No.
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division