Richard 1-4 (ARDF #SI056) Gypsum

Richard 1-4

Prospect, Probably inactive

Commodities and mineralogy

Main commodities	Gypsum
Ore minerals	gypsum

Geographic location

Quadrangle map, 1:250,000-scale	SI
Quadrangle map, 1:63,360-scale	D-3
Latitude	57.9258
Longitude	-134.9414
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The Richard 1-4 gypsum prospect is at an elevation of about 100 feet near a logging road that crosses Wukuklook Creek about 1.5 miles north-northeast of Flints Point. The prospect is 0.2 mile east-northeast of the center of sec. 31, T. 45 S., R. 65 E. It is MAS no. 0021140168 (U.S. Bureau of Land Management, 2002). The location probably is accurate within about 0.5 mile.

Geologic setting

Geologic description The rocks in the vicinity of this prospect are part of the Mississippian, Iyoukeen Formation (Lathram and others, 1965). The upper half of the formation is cherty fossiliferous limestone; the lower half is fossiliferous shale with minor limestone. A Cretaceous hornblende-biotite quartz monzonite stock is about 1.5 miles north of the prospect. Little is known about this prospect other than that a claim was staked here for gypsum. The deposit is probably similar to the deposit at the nearby Kaiser Gypsum Mine (SI059).
Geologic map unit	(-134.943183497774, 57.9254613312077)

Geologic description

The rocks in the vicinity of this prospect are part of the Mississippian, Iyoukeen Formation (Lathram and others, 1965). The upper half of the formation is cherty fossiliferous limestone; the lower half is fossiliferous shale with minor limestone. A Cretaceous hornblende-biotite quartz monzonite stock is about 1.5 miles north of the prospect. Little is known about this prospect other than that a claim was staked here for gypsum. The deposit is probably similar to the deposit at the nearby Kaiser Gypsum Mine (SI059).

Geologic map unit

(-134.943183497774, 57.9254613312077)

Production and reserves

Workings or exploration	Little is known about this prospect other than that a claim was staked for gypsum.
Indication of production	None

References

References Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48. U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Reporters	Donald Grybeck (U.S. Geological Survey)
Last report date	5/5/2005