Colorado, USA

Main commodities: U
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The Schwartzwalder uranium mine in the Front Range of Colorado, located ~30 km NW of the centre of Denver, Colorado, USA (#Location; 39° 50' 48"N, 105° 16' 57"W)>

It was historically the largest vein type uranium deposit in the USA.   Mineralisation is associated with a series of steep NW trending fault systems within a Palaeoproterozoic (1800 Ma) metamorphic terrane of garnet-biotite gneiss and quartzite at the transition between the regional mica schist and hornblende gneiss sequences.   This terrane was intruded by late Cretaceous to Tertiary dykes and plutons.

Mineralisation occurs in coarsely brecciated fault zones cemented by carbonate-adularia, with minor quartz-hematite cement.   The uranium is present as pitchblende deposited with the carbonate adularia and minor sulphides and followed by the main sulphide stage, dolomite, adularia and more calcite.

The mine commenced production in 1953 and was still in operation in the mid 1980's having produced more than 17 million pounds (7900 tonnes) of U3O8.

For detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1982.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Ludwig K R, Wallace A R, Simmons K R  1985 - The Schwartzwalder Uranium deposit, II: Age of Uranium mineralization and Lead isotope constraints on genesis: in    Econ. Geol.   v80 pp 1858-1871
Wallace A R  1982 - Structural and mineralogical characteristics and distribution of carbonate-dominated fault breccias associated with Uranium deposits, Front Range, Colorado: in    Econ. Geol.   v77 pp 1945-1950
Wallace A R, Karlson R C  1985 - The Schwartzwalder Uranium deposit, I: Geology and structural controls on mineralization: in    Econ. Geol.   v80 pp 1842-1857
Wallace A R, Whelan J F  1986 - The Schwartzwalder Uranium deposit, III: Alteration, vein mineralization, light stable isotopes, and genesis of the deposit: in    Econ. Geol.   v81 pp 872-888

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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