Silver Dick and Jennie claims

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Cu
Ore minerals native silver; tetrahedrite
Gangue minerals ankerite; calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale D-2
Latitude 58.936
Longitude -136.648
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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.
Geologic map unit (-136.649868739888, 58.9356072181039)
Mineral deposit model Low-sulfide silver-copper-bearing vein.
Age of mineralization Cretaceous.
Alteration of deposit 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 and reserves

Workings or exploration 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.
Indication of production Undetermined
Production notes Possibly some hand-picked silver ore was mined in the 1890s.

Additional comments

Paleozoic terrane; nearby intrusions of Cretaceous age. The occurrence is in Glacier Bay National Park. and Preserve.

References