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Reactivity in the south spoils and hillside dump at the Midnite Mine.

Authors
Moore-BW; Price-JW; Gardner-T
Source
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609, 1996 Jan; :1-227
Link
NIOSHTIC No.
20039393
Abstract
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.
Keywords
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
CAS No.
1309-36-0; 471-34-1
Publication Date
19960101
Document Type
Report of Investigations
Fiscal Year
1996
NTIS Accession No.
PB96-172606
NTIS Price
A12
Identifying No.
RI-9609
NIOSH Division
SLRC
Source Name
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609
State
UT; WA
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