Concentration of U and TH in the Bloedkoppie Granite, Namibia

Abstract

The leucocratic Bloedkoppie Granite is generally considered to be the source rock of most of the uranium concentrated in the nearby Langer Heinrich calcrete-hosted uranium deposit. Ground gamma-ray radiometric measurements for K, U and Th along two survey profiles within the Bloedkoppie Granite showed that the intrusive body is uranium-rich with 15 ppm U and 33 ppm Th. Pegmatite dykes within the granite contain relatively higher U concentrations (23 ppm) compared to the granite (10 ppm).