Rick's Prospect is approximately 12 km long and 2 km wide (Southworth, 1984). Foster and others (1979) describe the bedrock as greenschist to amphibolite facies rocks that have been intruded by Mesozoic and Tertiary igneous bodies. Locally, the area is overlain by Tertiary sedimentary and volcanic rocks. The stratigraphy of the ridge consists of metamorphic rocks overlain by siliceous carbonate rock with localized areas of intense Fe-staining and alteration. This is overlain by peridotite with localized phases of harzburgite, dunite, and serpentinite, and capped by gabbro and diorite rubble (Southworth, 1985). The underlying metamorphic rocks contain cherts that have radiolaria and conodonts of Permian age.
The gabbro and diorite contain disseminated magnetite with trace chalcopyrite. Both the peridotite and the underlying siliceous carbonate rock contain 0.25 to 4 percent disseminated chromite. Rare pods and schlieren of chromite have also been found. Cobb and Eberlein (1980) reported pods of high-grade chromite 1 foot in thickness and 3 feet in length. Chromian spinel is common in the weathered area of the siliceous carbonate rock. The chromian spinel is high in Al and Mg, and probably of no economic or industrial use.
The underlying siliceous carbonate rocks contain areas of serpentinite that are interpreted to have been altered to serpentinite by a CO2-rich fluid. Unweathered sections of the siliceous carbonate rock contain significant amounts of magnesite. Assays have revealed up to 17 percent MgO; a possible resource of magnesium (Southworth, 1985). Throughout the ridge, numerous assay results revealed no significant amounts of Ni, Co, Au or PGE. One occurrence of small pods of azurite and malachite, less than 0.5 cm in diameter, was observed in Fe-stained siliceous carbonate. A sample of this material contained relict chromite and minor veinlets of serpentinite, and assayed 1.14 percent Cu, 6,800 ppm Sb, 174 ppm As, and 24.6 ppm Ag (Southworth, 1985).The first published geologic description of the region was by Prindle (1905). Saunders (1965) performed a limited geochemical investigation of the prospect at the invitation of the then claim holder. Large-scale mapping of the area was completed by Weber and others (1979). The most recent detailed work on the ridge was completed in a joint effort by the Alaska Division of Geological & Geophysical Surveys, the U.S. Bureau of Mines, and the U.S. Geological Survey in 1983 (Southworth, 1985). Menzie and Foster (1979) reported some placer claim staking nearby on Rick's Creek and Black Bear Creek, which drain Nail Ridge to the northwest. No production has been reported for the area.