Jenny Reed

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Zn
Ore minerals chalcopyrite; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SD
Quadrangle map, 1:63,360-scale C-4
Latitude 57.59876
Longitude -133.31932
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Jenny Reed prospect is about 0.7 mile northeast of the mouth of Spruce Creek at the head of Windham Bay. It is about 0.7 mile northwest of the center of section 25, T. 49 S., R. 75 E.

Geologic setting

Geologic description

The Jenny Reed prospect is one of many auriferous lodes at the head of Windham Bay, most of which have been known since at least 1904 (Wright and Wright, 1906; Kimble and others, 1984). The prospect consists of two adits: the longest is about 165 feet long and the other is about 20 feet long (Kimble and others, 1984). The host rocks are muscovite schist and phyllite of Cretaceous age (Brew and Grybeck, 1984). The deposit trends along the long adit (Kimble and others, 1984; figure 32); it consists of a quartz-stringer zone with disseminated pyrite, sphalerite, and chalcopyrite. The zone is parallel to the foliation of the schist and phyllite. The richest sample collected by Kimble and others (1984) was a 7.4-foot-long channel sample that contained 1.0 part per million gold.
The deposits at the nearby Marty prospect (SD041) and the Sumdum Chief Mine (SD028) have been dated at about 55 million years (Goldfarb and others, 1997). This prospect is geologically similar and probably of the same age. Goldfarb and others (1997) also propose that most gold-quartz vein deposits along the Juneau Gold Belt such as this one were formed from fluids generated by Cretaceous metamorphism and then forced to the site of deposition by the emplacement of the Coast Range Batholith.
Geologic map unit (-133.321026840762, 57.5984200741213)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization The deposits at the nearby Marty prospect (SD041) and the Sumdum Chief Mine (SD028) have been dated at about 55 million years (Goldfarb and others, 1997). This prospect is geologically similar and probably of the same age.

Production and reserves

Workings or exploration The workings consist of two adits, one about 165 feet long and the other about 20 feet long. There was some exploration in the area in the 1970s but the workings date from before WW I.
Indication of production Undetermined

Additional comments

There may be patented claims or private holdings on this and other properties at the head of Windham Bay but most of the area is part of the Chuck River Wilderness Area which is closed to prospecting and mining.

References

MRDS Number A013343

References

Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Redman, Earl, 1988, History of the mines and miners in the Juneau gold belt: Juneau, Alaska, privately printed, 294 p.
Reporters Donald Grybeck (U.S. Geological Survey)
Last report date 10/8/2004