The JJR occurrence is located about 57 kilometres east of the community of Dease Lake, between the Turnagain River and Two Mile Creek.

The area of the JJR showing 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.

In 1971, reports of high-grade chromite in the vicinity led to the staking of the JJR claims over a belt of serpentinite between the Turnagain River and Wheaton Creek. It is reported that although substantial very low-grade nickel-bearing and chrome-bearing serpentine was sampled, nothing approaching ore grade was found. In 1972, Jorex Ltd. mapped and took 213 soil samples on the JJR claims.

A sample of chromite from a large boulder on Wheaton Creek, several kilometres to the east, assayed 47.5 per cent chromic oxide (Bulletin 2, pages 24-25). This indicates the potential for higher grade in situ chromite deposits in the area.

A small occurrence of poor-quality asbestos was also found on the south side of the top of "Black Mountain" (Assessment Report 3530).