Silver Dick and Jennie claims Prospect, Hoonah-Angoon Census Area, Alaska, USAi

Regional Level Types
Silver Dick and Jennie claims Prospect	Prospect
Hoonah-Angoon Census Area	Census Area
Alaska	State
USA	Country

Paleozoic terrane; nearby intrusions of Cretaceous age. The occurrence is in Glacier Bay National Park. and Preserve.
Location: The occurrence is about 30 feet above high tide on the west side of Rendu Inlet, about 3 miles above the mouth and 0.25 miles north of VABM Grey. The location of workings that date back to the 1890s was described by Rossman (1963-B 1121-K); it is probably accurate within 0.2 mile. It is location number 31 of Cobb (1972).
Geology: The deposit occurs in a hornfels- and marble-rich section of post-Silurian Paleozoic age, south of a large granite mass of Cretaceous age (Brew and others, 1978). Copper and silver minerals are associated with ankeritic quartz veins as much as 6 inches thick. The occurrence is in a north striking, west dipping vein that can be traced for several hundred feet on trend and about 100-ft vertically (Rossman, 1963, p. K48-49). Wire silver and tetrahedrite were found in veinlets in quartz at the property. MacKevett and others (1971, p. 69) reported barren ankerite-quartz and quartz-calcite veins in the same area. One ankeritic vein was described on the contact between marble and a 20-ft wide dioritic dike.
Workings: The deposit was discovered about 1893 and two claims were patented in 1894. A sixty-five foot adit was driven on the Silver Dick claim; there were trenches on both claims (Kimball, and others 1978, p. C187-188). Landslides and rock falls have apparently partly covered the old prospect area.
Age: Cretaceous.
Alteration: Rossman (1963, B 1121-K, p. K48) reports 'the country rock is extensively altered on each side of the fault [vein]', also that similar alteration is widespread. Rossman does not describe the alteration, but it likely is partly ankeritic.
Production: Possibly some hand-picked silver ore was mined in the 1890s.

Commodities (Major) - Ag; (Minor) - Cu
Development Status: Undetermined.
Deposit Model: Low-sulfide silver-copper-bearing vein.

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Link to USGS - Alaska:	MF054

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References