No fill is used to replace the mined ore. The primary jaw crusher is located underground. After further crushing in a small gyratory crusher, and grinding in a rod mill and ball mill circuit, free gold and copper concentrates are recovered by gravity and flotation. Pyrite is also recovered since this contains some of the gold. Block diagram showing major rock types and structural features.
Monitoring wells enable assessment of any change in water quality of the underlying aquifers.
Boring for underground access at Osborne. Diagram of access drives and production areas. Resource model and development. Tailing delivery and return lines are located in an earth bound containment system. Fresh floatation tailing cell, containing more than 1 million tonnes of tailing.