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Unnamed (beach southwest of Cinder River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Au; Fe; Ti
Ore minerals gold; ilmenite; magnetite

Geographic location

Quadrangle map, 1:250,000-scale BB
Quadrangle map, 1:63,360-scale A-2
Latitude 57.172
Longitude -158.479
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents beach placer deposits that extend approximately 10 miles to the northeast and 5 miles to the southwest of Hook Lagoon, which is approximately 35 miles southwest of the mouth of Cinder River. The location is accurate as plotted (MacKevett and Holloway, 1977, locality 1; Church and others, 1989, locality 22).

Geologic setting

Geologic description

This occurrence consists of narrow beach deposits of black sand which occur primarily along the strand line. The black sand forms thin veneers of surf-washed titaniferous magnetite, ilmenite, and pyroxene. To test the sands the U.S. Bureau of Mines (Berryhill, 1963) drilled 15 auger holes along 15 miles of beach. The holes varied from 3.4 to 9 feet in depth. The drill samples were analyzed for iron and titanium oxide.
The magnetic fraction contained 3.6 to 41 pounds of iron and 1.5 to 9.2 pounds of titanium oxide per cubic yard. The non-magnetic fraction contained 0.4 to 1.6 pounds of titanium oxide per cubic yard (Berryhill, 1963). Trace amounts of flour gold were recovered from two of the holes.
Geologic map unit (-158.481086953935, 57.1712288271818)
Mineral deposit model Shoreline placer titanium (Cox and Singer, 1986; model 39c).
Mineral deposit model number 39c
Age of mineralization Quaternary.

Production and reserves

Workings or exploration In 1963 the U.S. Bureau of Mines drilled 15 holes to test the titanium content of the black sands. The magnetic fraction contained 3.6 to 41 pounds of iron and 1.5 to 9.2 pounds of titanium oxide per cubic yard. The non-magnetic fraction contained 0.4 to 1.6 pounds of titanium oxide per cubic yard. Trace amounts of flour gold were recovered from two of the holes.
Indication of production None

Additional comments

This occurrence is located on state land.

References

MRDS Number A013223

References

Berryhill, R.V., 1963, Reconnaissance of beach sands, Bristol Bay, Alaska: U.S. Bureau of Mines Report of Investigations 6214, 48 p.
Reporters S.H. Pilcher (Anchorage)
Last report date 2/1/2000