|Quadrangle map, 1:250,000-scale||DE|
|Quadrangle map, 1:63,360-scale||D-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||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.|
Geologic descriptionThis 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.
|Geologic map unit||(-132.717163523258, 54.8307545435554)|
|Mineral deposit model||Silver-bearing calcite vein in metamorphic rocks.|
|Age of mineralization||Vein cuts pre-Ordovician rocks.|
|Alteration of deposit||Oxidization of sulfides.|
|Workings or exploration||Exploration consists only of sampling the vein in outcrop by private and government geologists.|
|Indication of production||None|
Additional commentsThe subsurface rights to the land in the vicinity are held by the Sealaska Corporation.
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.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||9/1/2003|