Marble of the Hadrynian Cunningham Formation(?) of the Upper Proterozoic Cariboo Group has been quarried at Maeford Lake, 100 kilometres east-southeast of Quesnel.

The marble is medium grained, milky white in colour and is occasionally cut by pyrite stringers. The marble also locally contains patches of tremolite.

Slater Mountain Industries began a hand operation quarrying the beautiful white marble in 1990. The marble was sold locally for use as dimension stone. The deposit is classed as producing less than 100,000 tonnes per year (Mineral Market Update July, 1991).