Report of Investigations 9609: Reactivity in the South Spoils and Hillside Dump at the Midnite Mine

Details

• Personal Author:
  Gardner, Ted ; Moore, Bruce W. ; Price, Jesse W.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Aluminum Silicates Chemistry Metals Occupational Health Safety
• Keywords:
  Abandoned-sites Acid-drainage Acid-neutralizing-capacity Chemical-analysis Chemical-reactions Drilling Neutralization Pyrite Radionuclide-migration Rock-fluid-interactions Sampling Sampling-methods Silicates Solubility Spoil Tailings Uranium-isotopes Uranium-mines

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• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  U.S. Department of the Interior, Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Place as Subject:
  OSHA Region 10 ; OSHA Region 8 ; Utah ; Washington
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SLRC - Salt Lake City Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  230 pdf pages
• NIOSHTIC Number:
  nn:20039393
• NTIS Accession Number:
  PB96-172606
• Citation:
  Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609, 1996 Jan; :1-227
• CAS Registry Number:
  Calcium carbonate (CAS RN 471-34-1) ; Pyrite (CAS RN 1309-36-0)
• Federal Fiscal Year:
  1996
• Peer Reviewed:
  False
• Source Full Name:
  Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 9609
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1ba4cc55e7f722932ead180374398785a1f3611ae887ef6e2d9737c2e54dbc21075db5851f4a28dc3a576059005adc556c61a7f7d56ec07bba326c119f2d0242
• Download URL:
  https://stacks.cdc.gov/view/cdc/201650/cdc_201650_DS1.pdf
• File Type:
  [PDF - 7.57 MB ]