|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Venus prospect is about 1.3 miles north-northwest of the mouth of Paul Young Creek in about the center of the SE1/4 section 19, T. 72 S., R. 84 E.|
The bedded rocks in the vicinity of the Venus prospect are Silurian: they include conglomerate with chert, rhyolite, and diorite clasts; and volcanic graywacke, tuff, agglomerate, and andesite. A Cretaceous gabbro pluton is south of the prospect (Sainsbury, 1961).
As described by Roehm (1938 [PE 119-12]), Warner and others (1961), and Maas and others (1995), the prospect is in greenstone (andesite?) cut by a diorite dike. The deposit is a vein that strikes N85E, dips steeply south, and is exposed for about 200 feet. The vein varies from a few inches thick at its eastern end to about 6 feet thick at its western end. Figure 35 of Warner and others (1961) is a map of the deposit. The vein locally is almost entirely pyrrhotite, with minor pyrite, sphalerite, chalcopyrite. The gangue is quartz and calcite. Three samples contained 0.01 ounce of gold per ton, up to 1 ounce of silver per ton, 0.91 to 1.78 percent copper, 33.1 to 52.4 percent iron, and 0.13 to 1.01 percent zinc (Warner and others, 1961). A sample across 6 feet of the vein contained 1.7 percent copper, 0.2 percent zinc, and 40.2 parts per million silver (Maas and others, 1995). The volcanic rocks up to several meters from the vein have been pyritized and intensely altered to chlorite and epidote.The deposit was found in 1904 by a magnetic survey. The workings consist of more than 800 feet of trenches and at least one short adit. Maas and others (1995) estimate that the deposit has an inferred resource of about 7,200 metric tons of material of variable grade.
|Geologic map unit||(-132.588443405662, 55.6090010261317)|
|Mineral deposit model||Pyrrhotite vein with chalcopyrite and sphalerite.|
|Age of mineralization||Unknown, other than that the vein in in Silurian volcanic and sedimentary rocks.|
|Alteration of deposit||The volcanic rocks up to several meters from the vein have been pyritized and intensely altered to chlorite and epidote.|
|Workings or exploration||The deposit was found in 1904 by a magnetic survey. The workings consist of more than 800 feet of trenches and at least one short adit.|
|Indication of production||None|
|Reserve estimates||Maas and others (1995) estimate that the deposit has an inferred resource of about 7,200 metric tons of material of variable grade.|
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., and Bittenbender, P.E., 1992, Mineral investigations in the Ketchikan mining district, Alaska, 1991 - Prince of Wales Island and Vicinity: U.S. Bureau of Mines Open-File Report 81-92, 69 p., 1 sheet, scale 1:20.
Roehm, J.C., 1938, Preliminary report of Venus Group, Karta Bay, Prince of Wales Island: Alaska Territorial Department of Mines Property Examination 119-12, 2 p.
Sainsbury, C.L., 1961, Geology of part of the Craig C-2 quadrangle and adjoining area, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Bulletin 1058-H, p. H299-H362.
Warner, L.A., Goddard, E.N., and others, 1961, Iron and copper deposits of Kasaan Peninsula, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Bulletin 1090, 136 p.
Wright, C.W., 1907, Lode mining in southeastern Alaska, in Brooks, A.H., and others, Report on progress of investigations of mineral resources of Alaska in 1906: U.S. Geological Survey Bulletin 314, p. 47-72.
Wright, C.W., 1915, Geology and ore deposits of Copper Mountain and Kasaan Peninsula, Alaska: U.S. Geological Survey Professional Paper 87, 110 p.
Wright, C.W., and Paige, Sidney, 1908, Copper deposits on Kasaan Peninsula, Prince of Wales Island, in Brooks, A.H., and others, Mineral resources of Alaska: report on progress of investigations in 1907: U.S. Geological Survey Bulletin 345, p. 98-115.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||5/1/2004|