Alligator River uranium deposit, Australia

Koongarra ore deposit. Alligator River Uranium Field, Australia Natural Analogue 0.48-0.5 0.38 13-25 Presence of a weathered zoned. Uranyl- carbonate complexes predominant due to high HC03 concentration in deeper groundwater. 

Unconformity-related deposits are found near principal unconformities. Examples include the ore bodies at Quff Lake, Key Lake, and Rabbit Lake in northern Saskatchewan, Canada, and in the Alligator Rivers area in northern Australia. Sandstone deposits are contained in rocks that were deposited under fluvial or marginal marine conditions. The host rocks nearly always contain pyrite and organic plant matter. The sediments are commonly associated with tuffs. Unoxidized deposits of this type consist of pitchblende and coffinite in arkasoic and quartzitic sandstones. Upon weathering, secondary minerals such as camotite, tuyamunite, and uranophane are formed. More information on these and other uranium deposit types is available (1). 

Rowntree, J.C. and Mosher, D.V., 1976. Case history of the discovery of the Jabiluka uranium deposits. East Alligator River region. Northern Territory of Australia. In Exploration for Uranium Ore Deposits. IAEA, Vienna, pp. 551-573. 

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