|Quadrangle map, 1:250,000-scale||PA|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Corn prospect is on a block of 121 placer and lode claims that were staked in the early 1970s. The center of these claims is about 1.5 mile west-southwest of triangulation station 'Low' which is at the prominent point at the northeast end of the peninsula north of Saginaw Bay. The center of the prospect is in the NW1/4 section 3, T. 58 S., R. 72 E., of the Copper River Meridian.|
This prospect is one of a group of similar deposits (PA021 to PA031) that are scattered along the south shore of Saginaw Bay, on the peninsula north of Saginaw Bay, and on the Keku Islands. They occur in a heterogeneous section of unmetamorphosed volcanic, carbonate, and clastic rocks that vary in age from Silurian to Triassic (Muffler, 1967). The mineralization generally consists of veins, veinlets, and irregular pods that contain base metals and barite (Still and others, 2002). There are no plutonic rocks in the immediate vicinity; however, the sedimentary rocks are cut by scattered gabbro dikes. The origin of the deposits is uncertain although most appear to be epigenetic. Various origins have been proposed including that they are remobilized massive-sulfide deposits, that they are related to a buried intrusive, or that they are Mississippi-Valley-type deposits.
A block of 121 claims was staked here in 1973 by Resource Associates of Alaska (Hedderly-Smith, 1990; Still and others, 2002). The claims were subsequently leased to Cominco American in the mid-1970s and they did detailed sampling, mapping, and geophysical surveys, and diamond drilled 2 or 3 holes. The claims were then leased to Mapco Inc. who drilled at least one hole at or near the property. The claims were allowed to lapse in the 1980s.
Most of the rocks on the claims are light-colored, locally brecciated rhyolite that is part of the the Keku Volcanics of Triassic age (Muffler, 1967; Still and others, 2002) Parts of the claim block are also underlain by Cornwallis Limestone and Carboniferous volcanic rocks.Little information is available about the industry work in the 1970s and 1980s. Still and others (2002) examined the property and found little more that scattered pods, veins, and stringers of barite in a thick section of rhyolite. One barite boulder contained 28.41 percent barium, 1.5 percent zinc, and traces of copper and lead.
|Geologic map unit||(-134.061931329491, 56.8737143211268)|
|Age of mineralization||Younger than the Triassic host rocks.|
|Workings or exploration||A block of 121 claims was staked here in 1973 by Resource Associates of Alaska (Hedderly-Smith, 1990; Still and others, 2002). The claims were subsequently leased to Cominco American in the mid-1970s and they did detailed sampling, mapping, and geophysical surveys, and diamond drilled 2 or 3 holes. The claims were then leased to Mapco Inc. who drilled at least one hole at or near the property. The claims were allowed to lapse in the 1980s.|
|Indication of production||None|
A portion of the claim block is on land that has been selected for patent by the Sealaska Native Corporation and the Kake Tribal Corporation.MAS number: 0021160035.
Hedderly-Smith, D.A., 1990, Report of the 1989 field season - Sealaska Mineral Reconnaissance Project: Sealaska Corporation, 58 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Muffler, L.J.P., 1967, Stratigraphy of the Keku Islets and neighboring parts of Kuiu and Kupreanof Islands, southeastern Alaska: U.S. Geological Survey Bulletin 1241-C, p. C1-C52.
Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002 Mineral assessment of the Stikine area, central Southeast Alaska: U.S. Bureau of Land Management Technical Report 51, 560 p.
|Reporters||Donald J. Grybeck (U.S. Geological Survey)|
|Last report date||2-Jan-05|