Chagvan Bay (ARDF #HG015) Cr

Chagvan Bay

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cr
Other commodities	Au; Pt
Ore minerals	chromite

Geographic location

Quadrangle map, 1:250,000-scale	HG
Quadrangle map, 1:63,360-scale	D-6
Latitude	58.81
Longitude	-161.75
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The Chagvan Bay occurrence is 4.5 miles of the modern beach, extending from 1.5 miles south of the mouth of Salmon River to the sand spit at the mouth of Chagvan Bay. The map site is at the approximate midpoint of the 4.5-mile-long of beach. This is locality 13 of Cobb (1972 [MF 362]; 1980 [OF 80-909]).

Geologic setting

Geologic description Berryhill (1963) collected 5 auger samples along this segment of the Kuskokwim Bay beach. Heavy mineral concentrates from these samples contained greater than 10 percent chromite and trace amounts of gold and platinum.
Geologic map unit	(-161.752221426663, 58.8092139767089)
Mineral deposit model	Placer PGE-Au; beach (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; there was surface sampling in the 1950s and probably at other times (Berryhill, 1963).
Indication of production	None

References

MRDS Number	10307613
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