Unnamed (west of Black Bear Lake)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities As
Ore minerals galena; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale C-3
Latitude 55.52869
Longitude -132.88463
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,200 feet, about 0.7 mile south-southwest of peak 3996 . It is about 0.2 mile north-northwest of the center of section 24, T. 73 S., R. 82 E.

Geologic setting

Geologic description

At this occurrence, Hedderly-Smith and Glavinovich (1991) sampled a 3-inch-thick quartz-sulfide vein. The sample contained 0.16 percent copper, 0.40 percent lead, 2.08 percent zinc, 0.72 percent arsenic, 63.4 parts per million (ppm) silver, and 2.13 ppm gold. The sulfides are not identified but based on the analysis, the main ore minerals are probably galena and sphalerite. The rocks in the area are mainly Silurian or Ordovician metavolcanic and metasedimentary rocks of the Descon Formation. The deposit is possibly related to a Cretaceous diorite and granodiorite pluton to the north (Eberlein and others, 1983; Brew, 1996).
Geologic map unit (-132.886279954882, 55.5283325262095)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Unknown; possibly related to a Cretaceous diorite and granodiorite pluton to the north (Eberlein and others, 1983; Brew, 1996).

Production and reserves

Workings or exploration Only sampling by private geologists.
Indication of production None

Additional comments

The land in the vicinity of this occurrence has been identified for possible selection by the Sealaska Corporation.

References

References

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D.A., 1989, Report of the 1988 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 66 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)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., 1991, Report of the 1990 work in the T75S, R83E, and T75S, R84E-Sealaska minerals reconnaissance project: Sealaska Corportion (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)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 (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)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., 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., 1997, Report on the 1995 and 1996 work on the Kasaan Peninsula-Sealaska minerals project: Sealaska Corporation, 87 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1997, Results of the 1996 upper Harris River stream sediment sampling-Sealaska minerals reconnaissance project: Sealaska Corporation, 9 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).
Hedderly-Smith, D.A., and Glavinovich, P.S., 1991; Moss-mat stream sediment sampling in the Threemile Creek-Black Lake area, southeastern Alaska: Explore, no. 71, p. 14-17.
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004