Johnson and Gouley; unnamed Occurrences, McLean Arm, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Geology: Although Maas and others (1991) could not find the Johnson and Gouley prospect, which reportedly is near this site, they found two other mineral occurrences nearby. Those occurrences are described in this record. The rocks in the area consist of Silurian or Ordovician syenite and quartz monzonite (Gehrels, 1992). One occurrence is at at elevation of about 1,480 feet. It consists of silicified monzonite that contains clots of pyrite-bearing quartz and calcite. A selected sample contained 208 parts per billion (ppb) gold, 4.4 parts per million (ppm) silver, and 364 ppm molybdenum. The other occurrence is at an elevation of 1,450 feet. It is in monzonite and consists of a quartz-calcite vein up to 0.4 foot thick. The vein contains pyrite, chalcopyrite, and malachite and the monzonite in the wall rock is silicified. Two samples, 0.3 and 0.4 feet long, across the vein contained 1.25 and 7.54 percent copper, 49 and 52 ppb gold, and 17.5 and 46.4 ppm silver. Samples of silicified monzonite wall rock contained 635 to 932 ppm copper, 0.3 to 0.5 ppm silver, and 8 to 14 ppb gold.
Workings: Although a prospect is reported in this area, the only work that can be documented is the sampling of mineralization by government geologists.
Age: Silurian or Ordovician or younger.
Alteration: The monzonite wall rock of the vein is silicified.
Commodities (Major) - Ag, Au, Cu, Mo
Development Status: None
Deposit Model: Quartz-calcite vein with copper, silver, molybdenum, and gold.
5 entries listed. 5 valid minerals.
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Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dixon Entrance quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-863, 34 p. Gehrels, G. E., 1992, Geologic map of southern Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2169, 23 p., 1 sheet, scale 1:63,360. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Maas, K. M., Still, J. C., Clough, A. H., and Oliver, L. K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: Southern Prince of Wales Island and vicinity--Preliminary sample location maps and descriptions: U.S. Bureau of Mines Open-File Report 33-91, 139 p. U.S. Bureau of Mines, 1944, Apex Group, McLean Arm, Prince of Wales Island, southeastern Alaska: U.S. Bureau of Mines, Draft Initial War Minerals Report, 14 p.