Apex Prospect, Chichagof District, Sitka Borough, Alaska, USA
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Geology: The rocks in the vicinity of the Apex prospect are part of the Jurassic and Cretaceous, Sitka Graywacke that consists mainly of graywacke and argillite (Loney and others, 1975). The location of the Apex prospect is shown on a map by Becker (1898) but it is not described in the text. The prospect was examined by Bittenbender and others (1999) who found abundant quartz float in a creek and a quartz breccia vein along a fault. The only working was an 8-foot adit along the fault. The vein strikes N30W, dips 75SW, is up to 1.7 feet thick, and contains arsenopyrite and trace chalcopyrite. A sample across the vein contained 270 parts per million (ppm) copper, 44 ppm arsenic, and 0.2 ppm silver. A select sample of the quartz float contained 920 ppm copper and 1.0 ppm silver. The highest gold values in any of the samples was 40 parts per billion.
Workings: The only working is an old 8-foot adit.
Age: Jurassic or younger based on the age of the host rock.
Production: Probably none.
Commodities (Major) - Ag, Au, Cu
Development Status: None
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
3 entries listed. 3 valid minerals.
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Becker, G.F., 1898, Reconnaissance of some gold fields of southern Alaska, with some notes on general geology: U.S. Geological Survey 18th annual report, Part 3, p. 7-86. Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p. Knopf, Adolph, 1912, The Sitka mining district, Alaska: U.S. Geological Survey Bulletin 504, 32 p. Loney, R.A., Brew, D.A., Muffler, L.J.P., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 p. U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]