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Unnamed Occurrence (ARDF - DE009), Lake Seclusion, Long Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Latitude: 54°49'51"N
Longitude: 132°42'54"W
Longitude: 132°42'54"W
Location: This occurrence is southeast of Lake Seclusion. It is in rock pit LI-1300-7 on logging road 1300, in about the middle of section 21, T. 81 S., R. 85 E. The location is accurate.
Geology: This occurrence is a 4-inch-thick galena vein discovered in the bottom of a rock pit by Sealaska Corporation geologists in 1988 (Hedderly-Smith, 1999). The rocks in the vicinity are pre-Ordovician dacitic metavolcanic rocks, marble, and argillite (Gehrels, 1991). A rock chip sample contained 2.40 percent copper, 10.30 percent lead, 7.54 percent zinc, 80.98 ounces of silver per ton, and 0.207 ounce of gold per ton. Workers in the area are said to have collected vein samples up to 6 inches thick. This or a similar vein in the same pit was sampled by Maas and others (1991) who describe it as a thin, vertical, calcite vein that strikes north-northwest and contains tetrahedrite and copper carbonates. Their best sample contained 41.62 ounces of silver per ton, 4.2 parts per million (ppm) gold, 1.38 percent copper, and 7,036 ppm zinc.
Workings: Exploration consists only of sampling the vein in outcrop by private and government geologists.
Age: Vein cuts pre-Ordovician rocks.
Alteration: Oxidization of sulfides.
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Silver-bearing calcite vein in metamorphic rocks.
Mineral List
| Calcite | Galena | Malachite | Tetrahedrite |
4 entries listed. 4 valid minerals.
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References
Gehrels, G. E., 1991, Geologic map of Long Island and southern and central Dall Island, southeastern Alaska: U.S. Geological Survey Map MF-2146, 1 sheet, scale 1:63,360. Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska). 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.
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