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Information Circular 8990: Chromite Deposits Along the Border Ranges Fault, Southern Alaska (In Two Parts): 1. Field Investigations and Descriptions of Chromite Deposits

Public Domain


Details

  • Personal Author:
  • Description:
    Chromite deposits along the border ranges fault in southern Alaska were investigated by the Bureau of Mines. This report, part 1 of a two-part series, describes the deposits. Part 2 describes the mineralogy and the results of metallurgical tests. Fieldwork began in 1981 and continued through 1983. Ninety-four subeconomic podiform chromite deposits in eight Mafic-ultramafic complexes were investigated. Previously unreported chromite deposits at Red Mountain on Kenai Peninsula, on Kodiak Island, and near Tonsina are described. Deposits range in size from less than a thousand tons to over 1.25 million tons of contained chromic oxide (cr2o3). Grades range from about 5 to 10 pct chromite. Excluding all deposits more than 10 miles from tidewater or existing roads and all deposits containing only chemical- or refractory-grade chromite, about 2,200,000 tons of cr203 are contained in 41 hard-rock deposits. A placer deposit contains an additional 556,000 tons. These 42 deposits constitute a subeconomic indicated and inferred reserve sufficient to meet the nation's chromite demands for about 4 yr, or the metallurgical industry's demands for over 5 yr, at 1981 consumption rates. [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • Subseries:
    Information Circular
  • Document Type:
    Text
  • Genre:
    Report
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    AFOC - Alaska Field Operations Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    63 pdf pages
  • Contributor:
    Ellis, William T.
  • NIOSHTIC Number:
    nn:10004567
  • Federal Fiscal Year:
    1985
  • Peer Reviewed:
    False
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:2102f770ce73b6a657817bf4e3a347129b65f9208688b2de239678502611dbc3f10de1235490636195add1bd0b85ef7e24512a800ff449a4680a1be6ff6b8ed1
  • Download URL:
  • File Type:
    Filetype[PDF - 6.37 MB ]
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