Copper King Prospect, Petersburg District, Wrangell-Petersburg Borough, Alaska, USA
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Geology: The country rocks in the general area of the Copper King prospect are Mesozoic or Paleozoic pelitic schist and paragneiss and subordinate amphibolite and marble (Koch, 1996, 1997). As mapped by George and Wyckoff (1973), the rocks have been metamorphosed to upper greenschist of lower amphibolite facies quartz-mica schists and hornblende-biotite-pyroxene-feldspar gneiss; rhyolite sills parallel the foliation. The Copper King prospect was staked in 1906 and restaked in 1951 (Chapin, 1916; Chapin, 1918, Berg and Cobb, 1967) Williams (1957) described the deposit as a 4.5-foot-thick quartz vein with sulfides that is exposed for about 45 feet along a small creek and in a 9-foot-deep shaft. A sample from the dump of the shaft contained 3.3 percent zinc and a trace of copper. Still and others (2002) located a quartz vein in place that contains sphalerite, chalcopyrite, and pyrite. A 0.7-foot sample across the vein contained 18.9 parts per million (ppm) silver, 5,639 ppm copper, and 2.1 percent zinc. A sample from the dump of the shaft contained 12 ppm silver, 4,694 ppm copper, and 1.9 percent zinc. They also located a quartz vein about 750 feet northwest of the shaft along a small creek. A 1.6-foot sample contained 679 parts per billion gold.
Workings: The Copper King prospect was staked in 1906 and restaked in 1951 (Chapin, 1916; Chapin, 1918, Berg and Cobb, 1967). Williams (1957) described the deposit as a 4.5-foot-thick quartz vein with sulfides that is exposed for about 45 feet along a small creek and in a 9-foot-deep shaft. Examined by Still and others (2002) as part of a regional mineral assessment by the Bureau of Land Management.
Alteration: Not noted.
Reserves: None.
Commodities (Major) - Ag, Au, Cu, Zn
Development Status: None
Deposit Model: Quartz vein with sulfides.
Mineral List
4 entries listed. 4 valid minerals.
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References
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p. Chapin, Theodore, 1916, Mining developments in southeastern Alaska: U.S. Geological Survey Bulletin 642-B, p. 73-104. Chapin, Theodore, 1918, Mining developments in the Ketchikan and Wrangell mining districts: U.S. Geological Survey Bulletin 662-B, p. 63-75. Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-922, 98 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. George, R.H., and Wyckoff, B.S., 1973, Whistlepig mineral exploration program, Alaska Final report (1972) (with attached diamond drill hole logs, and analyses: Unpublished El Paso National Gas Company report, 109 p., 12 sheets (available at the Bureau of Land Management Minerals Information Center, Juneau, Alaska). 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. Koch, R.D., 1997 [in press], Metalliferous mineral resource potential in the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report, 1 sheet, scale 1:250,000. Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002, Mineral assessment of the Stikine area, central southeast Alaska: Bureau of Land Management Technical Report 51, 560 p. Williams, J.A., 1957, Copper King prospect, Bradfield Canal quadrangle, copper: Alaska Territorial Department of Mines Prospect Evaluation PE 118-2, 5. p.