Silver King Prospect, Hyder District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Location: The Silver King prospect (Buddington, 1929, p. 100; Elliott and Koch, 1981, p. 11, loc. 28) is in Section 9 at an elevation of about 3800 feet on a steep west-facing mountainside overlooking Chickamin Glacier. It is about 1.1 mile north-northwest of Texas Lake. This location is probably accurate to within about a quarter of a mile.
Geology: The country rocks in the area near the Silver King prospect are metamorphosed pelitic strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Berg and others, 1977, p. 15-18, 22-23). Buddington (1929, p. 99-100) describes the deposit as a quartz fissure vein 6-30 inches thick in graywacke and argillite cut by a quartz diorite dike. The vein contains 2-8 inches of solid sulfides, including sphalerite, galena, pyrite, chalcopyrite, tetrahedrite, and a little arsenopyrite; a little barite also is present. A sample of the solid sulfides, chiefly galena, assayed 1.28 oz of Au and 5.96 oz of Ag per ton, 55% Pb, and 2.2% Cu. This prospect could not be located in 1972-73, probably owing to snow cover (Berg and others, 1977, p. 38-39). Lead-isotope studies of galena at the Silver King prospect indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite (Maas, 1995, p. 229-248).
Workings: According to Buddington (1929, p. 99-100), the lower exposure of the vein was stripped for 50 feet, and the upper exposure was stripped for 8 feet. An early assay of a sample of the solid sulfide part of the vein showed 1.28 oz of Au and 5.96 oz of Ag per ton, 55% Pb, and 2.2% Cu.
Age: Lead-isotope studies of galena at the Silver King prospect indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite (Maas, 1995, p. 229-248).
Commodities (Major) - Ag, Au, Cu, Pb, Zn; (Minor) - Barite
Development Status: None
Deposit Model: Polymetallic veins
8 entries listed. 8 valid minerals.
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Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords Wilderness Study Area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p. Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p. Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p., 1 plate.