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In 1896, two copper prospect tunnels were driven along iron stained shear planes in a shear zone paralleling schistosity and foliation of the adjacent biotitic and hornbleodic schists and gneisses. The upper drift penetrates the shear zone for about 100 feet and the lower drift about 170 feet. Sulphides taken from two crosscutting fracture systems and assayed in 1923 reportedly contained platinum metals along with gold and silver. Hess (1926, p. 130-132) reports the following value ranges: silver, a trace to 0.986 oz. per ton; gold, a trace to 0.06 oz. per ton; platinum, a trace to 1. 04 ozs. per ton; iridium (as determined may also include some rhodium, ruthenium, and/or osmium) up to 2.84 ozs. per ton; and palladium, up to 9.08 ozs. per ton. A third tunnel was driven through talus into mafic schists and gneisses several hundred yards south of the first two drifts. Samples collected by Hess (1926, p. 32) from fault gouge in this tunnel showed little more than traces of platinum and gold and less than an ounce of silver per ton.

Source: The Centennial Ridge Gold-Platinum District, Albany County, Wyoming, 1968. The Geological Survey of Wyoming.

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