Spectral gamma logging in the Copper Mountain uranium district: a case study in fractured quartz monzonite

KUT logs were used to characterize the geochemical variation of the Canning stock, and to test the allogenic versus authigenic hypotheses of uranium mineralization there. Raw log data were converted to concentrations of potassium (K), uranium (eU), and thorium (eTh), then the data were block averaged over 25-foot intervals to obtain mean concentrations. Based on the resultant values, slice maps were constructed by contouring the data at various horizons, and standard statistics were calculated. The preliminary results from the concentration data indicate that the Canning stock contains high K, eU, and eTh concentrations in the vicinity of the North Canning deposit. Thorium and potassium contents are correlated while uranium does not correlate with either to a significant degree. A general decrease in Th/U ratios toward the deposit suggests the lack of correlation of uranium with potassium or thorium is due to its greater geochemical mobility. 11 refs