Pyrola Prospect, Admiralty District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Location: The Pyrola prospect is at an elevation of about 2,600 feet, about 0.2 mile north-northeast of the southwest corner of sec. 15, T. 45 S., R. 67 E. The prospect is MAS no. 0021140184 (U.S. Bureau of Land Management, 2002). The location is accurate with 0.2 mile.
Geology: The Pyrola prospect is a volcanogenic massive-sulfide deposit in Triassic(?) felsic to intermediate volcanic rocks, carbonaceous siltstone, argillite, limestone and dolomite (Van Nieuwenhuyse, 1984; Berg, 1984; Newberry and others, 1997). The deposit consists of a 9-meter-thick stratiform layer of massive sulfides with barite and massive barite, interbedded with black argillite. The sulfides are mainly pyrite, sphalerite, and galena with minor chalcopyrite, jamesonite, and boulangerite. The mineralized layer is overlain by a distinctive pyrite-silica rock (halo?) about 0.5 to 6 feet thick. It is underlain by a weakly foliated sericite-quartz-carbonate unit derived at least in part from altered basalt; it contains 5-30 percent disseminated pyrite and veined pyrite. The deposit is probably similar to the Greens Creek Mine (Barnett and Miller, 2003; ARDF JU253) about 8 miles to the north, and like Greens Creek probably has gold and substantial silver values. The Pyrola prospect was discovered in 1954 and has been drilled. It is on active claims within the Wilderness of the Admiralty Island National Monument.
Workings: The Pyrola prospect was discovered in 1954 and has been drilled.
Age: Probably Triassic,analogous to the Greens Creek Mine (Barnett and Miller, 2003; ARDF JU253).
Alteration: This massive-sulfide deposit is overlain by a distinctive pyrite-silica rock (halo?) about 0.5 to 6 feet thick. It is underlain by a weakly foliated pyrite-sericite-quartz-carbonate unit derived at least in part from altered basalt.
Reserves: None have been published but may be significant.
Commodities (Major) - Ag, As, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Volcanogenic Ag-(Au?)-Cu- Pb-Zn massive sulfide deposit (Cox and Singer, 1986;
7 entries listed. 7 valid minerals.
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Barnett, J.C., and Miller, L.D., 2003, Alaska Resource Data File, Juneau quadrangle: U.S. Geological Survey Open-File Report OFR 03-456, 587 p. Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale 1:600,000. Newberry, R.J., Crafford, T.C., Newkirk, S.R., Young, L.E., Nelson, S.W., and Duke, N.A., 1997, Volcanogenic massive sulfide deposits of Alaska, in Goldfarb, R.J. and Miller, L. D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 120-150. Van Nieuwenhuyse, R., 1984, Geology and geochemistry of the Pyrola massive sulfide deposit, Admiralty Island, Alaska: Tucson, University of Arizona, M.A. thesis, approximately 300 p.