1. Mineral Resources
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  3. Alaska Resource Data File (ARDF)

Unnamed (north of French Harbor)

Occurrences, Undetermined

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Commodities and mineralogy

Main commodities Au; Cu
Ore minerals unspecified sulfide minerals

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-1
Latitude 55.18131
Longitude -132.01585
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is about 2 miles north-northeast of French Harbor, about at the center of the NW1/4 section 21, T. 77 S., R. 89 E. It is in the center of a poorly defined mineralized area about a mile wide that trends north for about two miles.

Geologic setting

Geologic description

Hedderly-Smith (1999 [Inventory]) noted numerous occurrences of sparse, stratabound, massive-sulfide mineralization along logging roads in an area about a mile wide that trends north for about two miles. The occurrences are marked by weak gossans. The rocks in the area are chlorite schist, greenstone, and minor limestone of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). Samples from the gossans, which are typically less than 1 foot thick, contain about 25 parts per billion (ppb) gold and 100 parts per million (ppm) copper. One sample contained 580 ppb gold and 148 ppm copper.
Geologic map unit (-132.017524782296, 55.1809549394728)
Mineral deposit model Stratabound massive-sulfide layers in schist with small amounts of gold and copper.
Age of mineralization Younger than the Late Proterozoic or Cambrian country rocks.
Alteration of deposit None specifically noted other than development of gossan.

Production and reserves

Workings or exploration Only surface sampling by industry along logging rocks.
Indication of production None

References

References

Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.
Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p.
Hedderly-Smith, D.A., 1989, Report of the 1988 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 66 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1992, Report of 1992 work in the Kael-Dolomi area-Sealaska minerals project: Sealaska Corporation, 60 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1993, Report of the 1992 field season-Sealaska minerals reconnaissance project: Sealaska Corporation, 60 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004