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AMIS0345,U 470 ppm, Uraniferous alaskite ,Rossing, Namibia
Origin of Material: AMIS0345 was supplied by Rio Tinto Limited from their Rössing Uranium Mine situated 70km north-east of Swakopmund in Namibia. The uranium mineralisation is associated with Neoproterozoic Damara Orogen syntactic alaskitic granites that display concordant, discordant and replacement relationships to the heavily folded host gniesses, marbles and limestones of the Khan and Rössing Formations.
Mineral and Chemical Composition: The uranium bearing minerals are mainly uraninite and its alteration products, and minor betafite.
Recommended Concentrations and Limits
(at two Standard Deviation
U XRF 470 ± 44 ppm
Ca M/ICP 1.77 ± 0.14 %
Ca XRF 1.84 ± 0.037 %
Nb M/ICP 27 ± 3 ppm
Specific Gravity 2.69 ± 0.07
Ta M/ICP 2.3 ± 0.4 ppm
U M/ICP 462 ± 58 ppm