Geology of Uranium Deposits

Jun 30th, 2015
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• Uranium occurs in a number of different igneous, hydrothermal and sedimentary geological environments. Uranium deposits world-wide can be grouped into 14 major categories of deposit types based on the geological setting of the deposits.

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Geology of Uranium Deposits(January 2010)Uranium occurs in a number of different igneous, hydrothermal and sedimentary geological environments.Uranium deposits world-wide can be grouped into 14 major categories of deposit types based on the geological setting of the deposits.Unconformity-related depositsUnconformity-related deposits arise from geological changes occurring close to major unconformities. Below the unconformity, the metasedimentary rocks which host the mineralisation are usually faulted and brecciated. The overlying younger Proterozoic sandstones are usually undeformed.Unconformity-related deposits constitute approximately 33% of the western world's uranium resources and they include some of the largest and richest deposits. Minerals are uraninite and pitchblende. The main deposits occur in Canada (the Athabasca Basin, Saskatchewan and Thelon Basin, Northwest Territories); and Australia (the Alligator Rivers region in the Pine Creek Geosyncline, NT and Rudall River area, WA).Hematite breccia complex depositsThe Olympic Dam deposit is one of the worlds largest deposits of uranium, and accounts for the major part of Australias uranium resources. The deposit occurs in a hematite-rich granite breccia complex in the Gawler Craton. It is overlain by approximately 300 metres of flat-lying sedimentary rocks of the Stuart Shelf geological province.The central core of the complex is barren hematite-quartz breccia, with several localised diatreme struct

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