|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 location for this old prospect described by Wright and Wright (1908) is vague. However, Sainsbury (1961) found a tunnel at the location used for this site that is probably the old prospect. It is about 0.8 mile west- southwest of Baker Point, and about 0.1 mile northeast of the center of section 25, T. 73 S., R. 85 E., of the Copper River Meridian.|
Geologic descriptionThe deposit at this old prospect is a (quartz?) vein that contains chalcopyrite and low gold and silver values; the vein strikes N 65 E and has a vertical dip (Wright and Wright, 1906; Wright, 1907; Wright and Wright, 1908). he vein is in highly metamorphosed greenstone with marble bands and 'bosses' of diorite, and follows one wall of a wide porphyry dike. The greenstone and marble are part of the Silurian and Ordovician, Descon Formation and the prospect is near a small Cretaceous(?) granitic body near Point Baker (Eberlein and others, 1983; Brew, 1996). An attempt was made to undercut the vein with a 135-foot tunnel that apparently did not reach it. Sainsbury (1961) identified the material on the dump of the tunnel as pyritized greenstone with specks of magnetite; he saw no copper minerals.
|Geologic map unit||(-132.424459209327, 55.5112866162821)|
|Mineral deposit model||Vein with low silver and gold values.|
|Age of mineralization||Unknown, other than that the vein is in Silurian or Ordovician greenstone and marble. The deposit may be related to a nearby Cretaceous(?) intrusion.|
|Workings or exploration||The vein was undercut by a 135-foot tunnel that apparently did not reach it.|
|Indication of production||None|
Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.
Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p.
Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p.
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.
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.
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, F.E., and Wright, C.W., 1906, Lode mining in southeastern Alaska, in Brooks, A.H., 1906, Report on Progress of Investigations of Mineral Resources of Alaska in 1905: U.S. Geological Survey Bulletin 284, p. 30-54.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||5/1/2004|