Economic Potential for Chromium, Platinum, and Palladium in the Mount Hurst Ultramafics, West-Central Area, Alaska.
Platinum, palladium, and chromite potential of the Ultramafic rocks of Mt. Hurst, Ophir quadrangle, west-central Alaska, was investigated in 1981 by the Bureau of Mines as part of a critical and strategic minerals program. Analyses of rock, stream sediment, soil, and panned concentrate samples indicate a low potential for lode and placer deposits of platinum, palladium, and chromite. The potential for paleoplacers is unknown. The discontinuous character of the Ultramafic rocks and the chemical variability of the chromite suggest the unlikelihood of economically significant platinum and palladium or chromite lode deposits. Placer potential for these metals is limited because of the relative absence of alluvial deposits in the first order drainages. Placer potential in larger adjacent drainages is unknown except for the apparent negative results of historical prospecting. The detection of platinum and palladium in selected chromite and panned concentrate samples suggest a source for the nearby Boob Creek placer platinum occurrence reported by previous investigators.