Jumbo Occurrence (near Texas Creek), Hyder District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Location: The Jumbo occurrence near Texas Creek is on or near the boundary of Sections 14 and 23 at an elevation of about 3750 feet on a north-facing mountainside overlooking the West Fork of Texas Creek and about 1.8 mile due east of Texas Lake (Elliott and Koch, 1981, p. 13, loc. 44). The location is probably accurate to within about a quarter of a mile.
Geology: The country rocks in the area of this occurrence are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite (Smith, 1977; Koch, 1996). The deposit (Buddington, 1929, p. 111) is in a graywacke roof pendant in granodiorite and consists of quartz-cemented graywacke breccia in a shear zone 1-3.5 feet wide. The quartz ranges from one-inch stringers to two-foot veins and carries local shoots of galena, pyrite, and chalcopyrite. Some of the graywacke country rock is impregnated with pyrite and a little chalcopyrite. A 10-inch wide intersecting fissure zone contains 6 inches of quartz carrying galena, pyrite, and a little chalcopyrite and sphalerite.
Alteration: Graywacke wallrock adjacent to quartz veins is impregnated with sulfide minerals.
Commodities (Major) - Cu, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins
5 entries listed. 5 valid minerals.
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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. Koch, R.D., 1996 [In press), Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report, 1 sheet, scale 1:250,000. 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.