The Provencher Lake placer mining leases cover a large area surrounding Provencher Lake, about 90 kilometres east-southeast of the community of Dease Lake.

The Provencher Lake area is underlain by northwest trending Mississippian to Triassic Cache Creek Complex rocks including metavolcanics, metasediments and tectonically emplaced ultramafic rocks of upper Mississippian to Permian age. The Cache Creek ultramafic rocks consist of peridotite, dunite and pyroxenite which are generally serpentinized.

Hundreds of nephrite jade boulders occur in the valley area surrounding Provencher Lake. Considerable drilling of these boulders by Nephro-Jade Canada occurred on numerous placer mining leases between 1976 and 1978. A total of 458 tonnes of jade was produced in the last two years (Assessment Reports 6959 and 7258). These boulders weigh up to 16 tonnes.

Some of this production may have come from stretches along Letain Creek to the north. Please refer to Letain Creek Jade (104I 079) located 6 kilometres north-northeast for further details.