Uranium ore-forming systems of the - Geoscience Australia

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Uranium ore-forming systems of the Lake Frome regionArmchair uranium prospect. As part of the ongoing plant biogeochemical studies at AdelaideUniversity vegetation has been sampled at this location (table 1).Hematitic breccia hand sample reported by Marshall (1979) gave a high U/Th ratio of ~6:1 (U =400ppm, Th = 70ppm), and a high proportion of U (110 ppm) is extractable. Although similarto the Mt Gee deposits, this is a variant in that Ba is low (140ppm) and Pb high (190ppm), (also420ppm Zn) probably reflecting parent rock composition. Cu is typically high (730ppm), withsome Ag (2ppm) and Mo (25ppm).Table 1: Neimanis & Hill (2006).Locality 10 (344470E ; 6657850N) Sillers LookoutBeverley Uranium MineSpectacular views northeastwards towards (from left to right) Mawson Plateau, Paralana Hot Springsand Paralana Fault, and Beverley Uranium Mine. The lookout was named after Bill Siller (Exoilconsortium chief), whose wife Beverley had the mine named after her.Leaving the Ridge Top Track returning to Arkaroola Tourist Complex. Thenfollow the track along the Paralana Fault and then to the eastern plains.Page 135 of 151
Uranium ore-forming systems of the Lake Frome regionLocality 11 (348350E ; 6651020N) Lady Buxton FaultImmediately alongside the track to East Painter/Paralana Hot Springs and near the Lady BuxtonCopper Mine is an exposure of field relationships demonstrating the neotectonic activity of theregion. Here the Adelaidean Wywyana Formation has been thrust over Cenozoic sediments.The footwall of this thrust is composed of partially consolidated ferruginous lithic gravels withsub-angular to sub-rounded pebbles up to 10 cm in diameter. Pebble lithologies include anassortment of Mesoproterozoic and Neoproterozoic rock types. The matrix of this sedimentincludes granules and coarse sand to silt dominated by quartz and maghemite and minor lithicfragments, with ferruginous and carbonate cement. The hangingwall consists of weatheredNeoproterozoic marbles of the Wywyana Formation. The thrust is oriented 070 o and dips at 20 otoward the north-west. Linear grooves on the fault plane trend down dip, indicating mostrecently dominantly dip-slip movement. An estimate of displacement along the structure isproblematic as the thickness of the footwall sequence is unknown. The age of the thrust ispoorly constrained as the footwall lithology is unique within the field area.The abundance of maghemite granules in the footwall sediment suggest a Neogene age, asmaghemite becomes more prevalent in sediments in the region post-dating the Miocene. Themoderate degree of consolidation and development of carbonate and ferruginous indurationsuggest a degree of antiquity but is not inconsistent with a Neogene age. The interpretedenvironment of deposition for these sediments is proximal colluvial-alluvial fans, which issimilar to the local sediments deposited in the contemporary landscape. These sediments mayrepresent a local lithological variation of the Willawortina Formation (Célérier, 2002).Page 136 of 151
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