Unnamed Occurrence (ARDF - HE065; divide between Partin and Little Shotgun creeks), Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA
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Geology: The country rocks in the area of this occurrence are a tectonically mixed assemblages of Upper Devonian serpentinite, basalt, chert, and gabbro. The deposit consists of pods of massive chromite in serpentinite. Rock samples from the surface contained low chromium, palladium, and platinum values (Balen, 1990: OFR 34-90). The chromite probably was a mag,atic segregation on the ultramafic host rocks.
Workings: Surface sampling only.
Age: The chromite probably was a magmatic segregation in Upper Devonian ultramafic intrusive rocks.
Alteration: Serpentinization of ultramafic rocks.
Commodities (Major) - Cr; (Minor) - Pd, Pt, Ni
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8a)
Mineral List
2 entries listed. 1 valid mineral.
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References
Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.