Granite of the Middle to Late Jurassic Nelson Intrusions intrude sediments of the Lower Cambrian Reno Formation (correlative with rocks of the Hamill Group). Quartzites, argillites and schists near the contact with the intrusives are silicified locally and contain pyrite, pyrrhotite, sphalerite and chalcopyrite.

These deposits are erratic in location and extent and carry low but consistent gold values. Grab samples from the dump carry gold in the range of 3 to 6 grams gold. One sample assayed 6.17 gram per tonne gold, 5.49 grams per tonne silver, 0.09 per cent copper, 0.01 per zinc and 0.004 per cent tungstic oxide (Assessment Report 8652).