At the mouth of the Hurley River, from the eastern rim, "over 1000 ounces" (over 31,000 grams) of coarse gold is reported to have been recovered from serpentine bedrock or high rim (banks?) gravels. The largest nugget weighed 404 grams, but more common were 31 to 150 gram nuggets (Geological Survey of Canada Memoir 213).
The area is underlain by the President Ultramafics which are correlative with the Permian and older Shulaps Ultramafic Complex.