The Brisco deposit is located about 30 metres east of Highway 95, 2.4 kilometres north of Brisco.

Quartzite of the Middle and/or Upper Ordovician Mount Wilson Formation forms a bed 60 to 90 metres thick, striking northwest and dipping steeply to the northeast. The quartzite is hard, massive, white, medium to fine-grained and overlain by dolomite.

In 1964, 2450 tonnes of silica were quarried and shipped. A test shipment was refused by Wenatchee, Washington due to the high calcium content. Pieces randomly picked, in 1964, from the muck pile assayed; 98.66 per cent SiO2, 0.47 per cent Al2O3, 0.06 per cent Fe2O3 and 0.08 per cent CaO (Open File 1987-15).