A small radiation anomaly present over mullock heaps of the Hillside mine can be satisfactorily explained by the presence there of scattered, moderately radioactive fragments of pitchblende. These appear to have been mined either from calcite-pitchblende veins formed within rhyolite porphyry of probable Carpentarian age, or from dolomite or dolosiltstone of probable Cambrian age. A determination of the trace metal geochemistry of the mullock and of the host rocks to the mineralisation has merely highlighted copper, which is to be expected, in view of the abundant malachite, ?atacamite, and chalcopyrite-pyrite scattered over the surface.