The Greenrock jade occurrence is located about 49 kilometres east of the community of Dease Lake.

The occurrence is underlain by upper Mississippian to Permian ultramafic rocks of the Cache Creek Complex. These rocks consist of peridotite, dunite and pyroxenite which are generally serpentinized.

These rocks locally include pods of nephrite jade, two of which are plotted on Geological Survey of Canada Open File map 2779 near the headwaters of Greenrock Creek.