Unnamed (north of Gould Island)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Ba; Sb
Ore minerals galena; sphalerite
Gangue minerals calcite

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-2
Latitude 55.304
Longitude -132.60043
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 2,200 feet, just above timberline. It is about 1.3 mile northeast of the abandoned town of Sulzer and about 0.4 mile south-southeast of the center of section 2, T. 76 S., R. 84 E.

Geologic setting

Geologic description

This prospect was first described by Chapin (1918) but apparently has had little attention since. It consists of several small but prominent prospect pits in massive marble of the Wales Group of Late Proterozoic and Cambrian age (D.J. Grybeck, unpublished field notes and analyses, 1984). The dumps contain abundant material with nearly massive sphalerite and galena, and bright-orange gossan. There is minor copper staining and considerable oxidation of the sulfides to secondary lead and zinc minerals. The prospect pits extend for a length of about 300 feet over a vertical range of about 100 feet. Selected sulfide-rich samples contained 20-700 parts per million (ppm) silver, 2,000 to more than 5,000 ppm barium, 500-10,000 ppm copper, and 150-1,500 ppm antimony, as well as major lead and zinc that reflect the galena and sphalerite. The ore minerals are probably a replacement deposit in marble.
Geologic map unit (-132.602089317196, 55.3036468785183)
Mineral deposit model Ag-Pb-Zn replacement in marble.
Age of mineralization Unknown, other than that the deposit is in Cambrian or older marble.

Production and reserves

Workings or exploration Several prospect pits over a length of about 300 feet.
Indication of production None

Additional comments

This prospect is on land that has been conveyed to the Sealaska Corporation, who hold the surface and subsurface rights, or the land is under application for transfer to them.

References

MRDS Number A010161

References

Glavinovich, P.S., 1987, Sealaska Corporation Minerals Breifing Book, December 1987: Sealaska Corporation, 40 p. and plates. (Unpublished report held by Sealaska Corporation, Juneau, Alaska).
Hedderly-Smith, D.A., 1992, Report of the 1991 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 2 vols., 225 p. 23 plates. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1997, Report of the 1996 work in the Mount Jumbo area-Sealaska minerals reconnaissance project: Sealaska Corporation, 51 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