Abstract
Abstract Uranium indications in the Tasjo Lake area, Vasternorrland County, discovered in 1957 by the Swedish Atomic Energy Company, have been the subject of comprehensive geological studies by this company from 1960 through 1965. Attention has been directed mainly to the basal Ordovician units within the Cambro-Ordovician of the area. Electromagnetic, magnetic and radiometric aerial prospecting has been carried out over the entire concession area, with a line spacing of 125 m at an altitude of 30 m. By means of field studies, including 68 boreholes comprising in all 2131 m of core, geological, tectonic, radiometric and geochemical ground studies and investigations of the aerial anomalies, it has been possible to map the extension of the uranium-bearing unit within an area 20–30 km long and 10 km wide. Palaeontological studies in the area have shown that the uranium-bearing unit is Early Ordovician in age. The structural geology of the area is characterised by short overthrusts of the Schuppen type, altho...
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