The Kawau copper lode is contained in silicified greywacke and dips downward at a high angle. Above ground water level the sulphide is well weathered and oxidised to sulphate, the blue copper sulphate being easily seen in the exposure on the spur.   Blue copper sulphate visible in the flooded drift entrance adjacent to the Cornish Pump House built on the south side of the island.           Lower down in the lode there is a transition through an enriched zone where copper from the weathered ore … Continue reading Kawau Copper Mine operation and ore smelting