Lucky Find Prospect, Karta River Wilderness, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
This prospect is in the Karta River Wilderness Area, which is closed to exploration and mining.
Location: The only published location for the Lucky Find prospect is on a small map by Wright and Wright (1908) that cannot be reconciled with the modern USGS 1:63,360-scale topographic map. For this record, the location is about 0.3 mile west-southwest of Granite Mountain and about 0.2 mile northwest of the center of section 20, T. 73 S., R. 84 E. The location is probably accurate to within 0.5 mile.
Geology: The rocks in the vicinity of the Lucky Find prospect are part of a large granodiorite-quartz diorite stock (Sainsbury, 1961; Eberlein and others, 1983; Brew, 1996). Early workers considered the stock to be Mesozoic or Cretaceous; however, recent radiometric dating indicates that it is Devonian (S.M. Karl, oral communication, 2003). Wright and Wright (1908) describe this prospect as a 1-foot-thick quartz vein between a diabase dike and granite. The vein also contains calcite and possibly siderite, as well as chalcopyrite and pyrite. The prospect has been explored by a 50-foot tunnel.
Workings: Prospected by a 50 foot tunnel.
Age: Unknown, other than that the vein is in Devonian granitic rocks.
Commodities (Major) - Au?, Cu
Development Status: None
Deposit Model: Gold?-quartz vein, with chalcopyrite.
5 entries listed. 5 valid minerals.
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Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Herreid, Gordon, and Rose, A.W., 1966, Geology and geochemistry of the Hollis and Twelvemile Creek area, Prince of Wales Island southeastern Alaska: Alaska Division of Mines and Minerals Geologic Report 17, 32 p. Sainsbury, C.L., 1961, Geology of part of the Craig C-2 quadrangle and adjoining area, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Bulletin 1058-H, p. H299-H362. Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.
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Locality Updated: Estremoz, Évora District, PortugalFrom Rui Nunes, 24th Apr 2014 10:36:34