Main commodities | Ag |
---|---|
Other commodities | Cu |
Ore minerals | native silver; tetrahedrite |
Gangue minerals | ankerite; calcite; quartz |
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 descriptionThe 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. |
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 commentsPaleozoic terrane; nearby intrusions of Cretaceous age. The occurrence is in Glacier Bay National Park. and Preserve. |
MRDS Number | A013165 |
---|---|
References | |
Reporters | C.C. Hawley (Hawley Resource Group) |
Last report date | 4/9/1999 |