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  3. Alaska Resource Data File (ARDF)

Red Mountain

Occurrence, Active

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Commodities and mineralogy

Main commodities Cr
Other commodities Au; Pt
Ore minerals chromite
Gangue minerals augite; hornblende; olivine

Geographic location

Quadrangle map, 1:250,000-scale HG
Quadrangle map, 1:63,360-scale D-6
Latitude 58.949
Longitude -161.752
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the west flank of Red Mountain, at an elevation of about 1,250 feet. It is sample locality 45 of Berryhill (1963) and is approximately located, probably within about 1/4 mile. It is locality 6 of Cobb (1972 [MF 362]; 1980 [OF 80-909]).

Geologic setting

Geologic description

Berryhill (1963, sample locality 45) collected a shovel sample of surface materials at this location and determined that the heavy mineral concentrates contained greater than 10 percent chromite and traces of Pt and Au. Augite, hornblende, and olivine were also reported to be present in amounts exceeding 10 percent. This occurrence is on the steeper part of the west flank of Red Mountain, a composite ultramafic pluton containing abundant dunite. The surface materials at this site are expected to be colluvial and to have been derived directly from erosion of the Red Mountain pluton.
Geologic map unit (-161.754228335265, 58.948216231451)
Mineral deposit model Placer PGE-Au (Cox and Singer, 1986; model 39b)
Mineral deposit model number 39b
Age of mineralization Holocene.

Production and reserves

Workings or exploration No workings are present.
Indication of production None

References

References

Berryhill, R.V., 1963, Reconnaissance of beach sands, Bristol Bay, Alaska: U.S. Bureau of Mines Report of Investigations 6214, 48 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Hagemeister Island quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-362, 1 sheet, scale 1:250,000.
Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.
Reporters Travis L. Hudson
Last report date 3/18/2001