Late Proterozoic quartzo-feldspathic gneiss containing quartz-filled shears with copper and lead mineralisation. Silicified limonitic gossans, which exhibit fine boxwork texture after sulphides also occur along this trend. Galena, dated at 1900 million years, has been reported from the same area.
Geological survey mapping describes the rocks as Archaean and Proterozoic gneiss. The metamorphic overprint is attributed to a period of Proterozoic thrusting along the intensely deformed Albany-Fraser mobile zone, which is believed to represent an accretionary zone of thrusting between continental margins. Indeed, the site marks a triple junction between the Albany Fraser Mobile zone and the two Archaean terranes - the Western Gneiss and Yilgarn Block. Such triple points are widely regarded as favourable target areas for concentration of minerals. |
