Nimbus silver-zinc deposit.

The massive sulphide deposit, in Western Australia, is the first example of high grade Ag-Zn found in the Kalgoorlie area. It is hosted by feldsparphyric felsic rocks of rhyolitic to dacitic composition, including flow-banded lava, breccia and fine grained felsic volcaniclastic sandstone. Secondary Ag-Au mineralisation occurs in two zones: within the completely oxidised weathering zone and at or near the base of oxidation. Sulphide zone mineralisation occurs within fresh rock below this transition zone. The main Ag-bearing mineral within the oxide zone is cerargyrite, native Ag occurs in the transition zone with secondary Cu minerals, and the dominant minerals in the sulphide zone are sphalerite and pyrite. An identified mineral resource totalling 929 000 t at 270 g/t Ag and 0.3 g/t Au has been estimated for the oxide and transition zone. No resource estimate has yet been made for the sulphide mineralisation.
The massive sulphide deposit, in Western Australia, is the first example of high grade Ag-Zn found in the Kalgoorlie area. It is hosted by feldsparphyric felsic rocks of rhyolitic to dacitic composition, including flow-banded lava, breccia and fine grained felsic volcaniclastic sandstone. Secondary Ag-Au mineralisation occurs in two zones: within the completely oxidised weathering zone and at or near the base of oxidation. Sulphide zone mineralisation occurs within fresh rock below this transition zone. The main Ag-bearing mineral within the oxide zone is cerargyrite, native Ag occurs in the transition zone with secondary Cu minerals, and the dominant minerals in the sulphide zone are sphalerite and pyrite. An identified mineral resource totalling 929 000 t at 270 g/t Ag and 0.3 g/t Au has been estimated for the oxide and transition zone. No resource estimate has yet been made for the sulphide mineralisation.