... material is abundantly preserved in numerous other strongly altered basement-hosted unconformity-related uranium deposits in both Australia and Canada, including Jabiluka ( Ewers and Ferguson, 1980 ; Hancock et al., 1990 ), Koongarra ( Snelling, 1980 ; Isobe et al., 1992 ), Key Lake ( Wilson and Kyser...

...A. R. Wilde; T. P. Mernagh; M. S. Bloom; Christopher F. Hoffmann Abstract Fluid inclusions in altered and unaltered host rocks and hydrothermal quartz, calcite, and dolomite from the unconformity-related uranium deposits of Koongarra, Nabarlek, and Jabiluka (Northern Territory, Australia) were...

...Roland Maas Abstract The results of an Sm-Nd and Rb-Sr isotope study on the large and rich unconformity-type uranium-(gold-platinum-group elements) deposits in northern Australia indicate identical Sm-Nd ages for primary uranium mineralization at Nabarlek (1,616 + or - 50 m.y.) and Jabiluka II...

...Takashi Murakami; Toshihiko Ohnuki; Hiroshi Isobe; Tsutomu Sato Abstract Mineralogical and geochemical mechanisms of U fixation under oxidizing conditions in the vicinity of the secondary U ore deposit at Koongarra, Australia, were examined using transmission and scanning electron microscopy...

...M. R. Hegge; J. C. Rowntree Abstract Major uranium deposits, including Jabiluka, Ranger, Koongarra, and Nabarlek, plus numerous smaller prospects, occur in metamorphosed lower Proterozoic psammatic, pelitic, and chemical sediments of the Cahill Formation (South Alligator Group...

... Pb dates previously obtained from the deposit ( Greenhalgh and Jeffery 1959 ; Table 6 ) as well as the upper-intercept dates previously obtained from uraninite at Nabarlak (920 Ma) and Koongarra (870 Ma) in northern Australia ( Hills and Richards 1976 ; Table 6 ). Furthermore, this upper-intercept...

... on the relative age of displacement. Johnston’s (1984) structural study of the analogous Koongarra deposit, however, demonstrates that uranium ore is unequivocally associated with fault movement that postdated deposition of the unconformable Kombolgie Formation, which itself postdates uplift and denudation...

... Geological Survey, Helsinki) and Peter Duerden (ANSTO, Sydney), who co-ordinated research at the Palmottu and Koongarra uranium deposits, respectively, is gratefully acknowledged. References Andreoli , M.A.G. , Smith , C.B. , Watkeys , M. , Moore , J.M. , Ashwal L.D. and Hart...

..., Nabarlek, and Koongarra) and a number of unexplored prospects. These deposits are today one of the major sources of uranium in the world. In 2000, all unconformity-type uranium deposits produced 14,440 metric tons (at) of uranium (41% of the world production), of which 3,760 t came from the Ranger mine...

... with relatively recent (100,000 years ago) fluid events and alteration ( Heath 1995 ). The Koongarra uranium Deposit, Australia, which is hosted in phyllosilicate, clay, and carbonate-rich sediments, was the focus of many natural analogue studies between 1989 and 1992, which produced contradicting reports...

... : Australian Institute of Mining and Metallurgy Monograph 22 , p. 759 – 768 . Snelling , A.A. , 1990 , Koongarra uranium deposits , in Hughes , F.E. , ed., Geology of the mineral deposits of Australia and Papua New Guinea : Australasian Institute of Mining and Metallurgy Monograph 14 , p...

... with clay minerals in modern weathering profiles, which has been attributed to adsorption of Ce 4+ on the surfaces of clay particles (e.g., Braun et al. 1990 ). Koppi et al. (1996) reported an association of cerianite with secondary Fe and Mn minerals in weathered rocks at the Koongarra U deposit...

.... , Yanase , N. , Isobe , H. , Payne , T.E. , and Airey , P.L. ( 1997 ) Iron nodules scavenging uranium from groundwater . Environmental Science and Technology , 31 , 2854 – 2858 . Snelling , A.A . ( 1980 ) Uraninite and its alteration products, Koongarra uranium deposit...

... Jabiluka, Ranger, Nabarlek, and Koongarra deposits in the Alligator Rivers uranium field (Fig. 1 ) and the sandstone-hosted Redtree, Junnagunna, and Huarabagoo deposits (Fig. 2 ) in the Westmoreland area ( Anthony, 1975 ; Ewers and Ferguson, 1980; Snelling, 1980 ; Wilde and Wall, 1987 ; Needham, 1988...

... written: … an emerging world nuclear industry re-invigorated the mining industry which launched major exploration programs across Australia, with extraordinary success. Over 1969 to 1975 numerous and sometimes large and high grade new uranium deposits were discovered. Some rich deposits—Ranger...

.... Paleoproterozoic rocks of northern Australia also host significant unconformity-related uranium deposits (e.g., Koongarra, Nabarlek, and Jabiluka: Ewers and Fergusson, 1980 ). Mineral paragenetic and geochemical studies in rocks of the Kombolgie Sandstone, the basal proximal fluvial facies of the Leichhardt...

... Field (Northern Territory, Australia) contains ~15% of the world’s low-cost uranium resources and comprises the Jabiluka, Nabarlek, Ranger and Koongarra uranium deposits. Nevertheless only a few data are available on clay paragenesis and fluid evolution in the McArthur Basin and in the sandstones from...

... in the present study is very similar to the reported pseudomorphosis of saléeite (Mg-member of autunite) after apatite from the Koongarra U-deposit (Australia) ( Murakami et al. , 1997 ; Finch & Murakami, 1999 ). At the Koongara deposit, primary uraninite was altered by oxidizing fluids and subsequently...