A soil geochemistry orientation survey for uranium at Koongarra, Northern Territory |
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| Authors: | AA Snelling |
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| Abstract: | A soil geochemistry orientation survey for U at Koongarra was designed to determine optimum conditions for future U exploration in the area. Soil samples were collected at various depths from auger holes drilled along two traverses over the Koongarra No. 1 orebody, along a single traverse over suspected mineralization at nearby Anomaly A, and at three background localities. Rock samples collected from surface outcrop, costeans, and drill core were used to investigate any elemental associations with the ore or primary dispersion which could then be traced in the overlying soils.The results showed that Cu and Pb are potentially suitable pathfinder elements, where U data are not definitive, while Co, Ni and Be also provide significant information. The optimum sample depth was 1.2 m. For a Koongarra-sized target the maximum sample spacing should be 30 m on lines 200 m apart, provided every anomalous sample is followed up with closer spaced sampling around it. Anomalies detected in alluvial soil deeper than 1.2 m were due to hydromorphic dispersion. Some of the general distribution patterns for individual elements may be related to soil-type variations. |
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