Allied Group E Prospect, Kupreanof District, Wrangell-Petersburg Borough, Alaska, USA
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Location: This prospect is on the point at the south side of the entrance to Saginaw Bay. It is about 1.9 mile south-southwest of Cornwallis Point, near the middle of the southern boundary of section 19, T. 57 S., R. 71 E. The location is accurate.
Geology: 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. The Allied prospect consists of barite in pods and irregular veins 0.1 to 1.4 thick that extend for up to 80 feet (Still and others, 2002). The pod and veins cut volcanic breccia of Devonian to Silurian age. Three samples contained 31 to 41 percent barium. No sulfides occur here.
Workings: Claims were first staked in 1955 but there is no record of extensive work. The site was sampled by the Bureau of Land Management (Still and others, 2002).
Age: Younger than the Silurian or Devonian host rocks.
Commodities (Major) - Ba
Development Status: None
Deposit Model: Barite in thin veins and pods.
1 entry listed. 1 valid mineral.
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Buddington, A.F., 1925, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 773-B, p. 71-139. 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.