Dolly Varden

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals azurite; malachite; tetrahedrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-3
Latitude 55.34262
Longitude -132.68865
Nearby scientific data Find additional scientific data near this location
Location and accuracy Based on several old but probably reliable references (Brooks, 1902; Wright and Wright, 1908), the Dolly Varden prospect is at an elevation of about 1,100 feet, about 1.7 miles southeast of the head of Twelvemile Arm and about 0.6 mile northwest of the center of section 29, T. 75 S., R. 84 E. Herreid and Rose (1966), probably incorrectly, suggest that the Dolly Varden prospect is about 3 miles to the west at their locality 2 (which is ARDF CR109).

Geologic setting

Geologic description

As described by Brooks (1902) and Wright and Wright (1908), the deposit at the Dolly Varden prospect consists of auriferous (quartz?) veins that strike N15E and dip steeply to the SE or are vertical. The veins follow the layering in marble and contain tetrahedrite altered to azurite and malachite. The marble is part of the Wales Group of Cambrian and older age (Eberlein and others, 1983; Brew, 1996). There is no report of workings on these claims. Bufvers (1967) indicates that the quartz stringers occur in an area about 20 feet wide and 30 feet long. A sample taken in 1924 contained $80 a ton in gold and silver. Maas and others (1992, 1995) collected four samples that contained up to 20 parts per billion gold, 7.6 parts per million (ppm) silver, and 1,329 ppm copper.
Geologic map unit (-132.690301129542, 55.3422673914541)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c?
Age of mineralization Veins cut marble of Cambrian or older age.

Production and reserves

Workings or exploration Apparently none.
Indication of production None

References

MRDS Number A010038

References

Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004