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    Gold Placers and Placering in Arizona

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    Bull_168_Gold_Placers_OCR.pdf
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    Author
    Wilson, E.D.
    Issue Date
    1961
    Keywords
    Arizona Geological Survey Bulletins
    Yuma
    Yavapai
    Arizona Counties
    Pima
    Oatman
    Greaterville
    Arizona
    placer equipment
    prospecting
    sedimentation
    placers
    mining districts
    heavy minerals
    gold
    economic mineralogy
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    Description
    Gold placers, or deposits such as gravel and sand which contain notable concentrations of gold, all result from the slow milling and concentration processes incident to natural erosion of pre-existing gold-bearing rocks. The origin of many gold placers is traceable directly to auriferous veins, lodes, or replacement deposits which, in most instances, were not of high grade. According to Emmons, placers are not apt to form from goldbearing outcrops that contain abundant manganese, iron sulphides, and chlorides, unless precipitating agents such as calcite, siderite, rhodochrosite, pyrrhotite, chalcocite, nepheline, olivine, or leucite are abundant, or unless erosion is very rapid. In other words, the gold may be dissolved and carried below by means of natural chlorination processes that are established when solutions containing chlorides, together with sulphuric acid from the oxidation of iron sulphides, act upon manganese dioxide; but this process is neutralized if precipitating agents are present, and may be ineffective if erosion is very rapid
    URI
    http://hdl.handle.net/10150/629779
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    Bulletin 168
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    36.985
    South Bounding Coordinate
    31.3161
    West Bounding Coordinate
    -114.829
    East Bounding Coordinate
    -108.984
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