|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||C-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Buckhorn prospect is at an elevation of about 3,000 feet about 0.3 mile north of Granite Mountain and 0.5 mile south of the center of section 17, T. 73 S., R. 84 E. The location is accurate.|
Geologic descriptionThe rocks in the vicinity of the Buckhorn prospect are part of a large granodiorite-quartz diorite stock (Sainsbury, 1961; Eberlein and others, 1983; Brew, 1996). Early workers considered it to be Mesozoic or Cretaceous, but recent radiometric dating indicates that it is Devonian (S.M. Karl, oral communication, 2003). Wright and Wright (1908) described the Buckhorn prospect as 9 claims explored by open cuts and several tunnels. A quartz vein about 15 inches wide that strikes N5W and dips 45NE can be traced for several miles. The vein has free gold and sulfides. The sulfides are unspecified but the vein reportedly is similar to quartz veins at the Flagstaff Mine (CR043) that contain chalcopyrite, galena, and pyrite. Maas and others (1991) found a trench and caved adit. A 1-foot sample across a quartz vein in the trench had negligible metal values. A sample of quartz with pyrite from the dump of the adit contained 2.2 parts per million (ppm) gold and 15.7 ppm silver.
|Geologic map unit||(-132.678579688625, 55.5332800445149)|
|Mineral deposit model||Gold-quartz vein (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Age of mineralization||Unknown, other than that the vein is in Devonian granitic rocks.|
|Workings or exploration||The workings consist of a trench and a caved adit.|
|Indication of production||None|
Additional commentsThis prospect is in the Karta River Wilderness Area, which is closed to exploration and mining.
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.
Herreid, Gordon, and Rose, A.W., 1966, Geology and geochemistry of the Hollis and Twelvemile Creek area, Prince of Wales Island southeastern Alaska: Alaska Division of Mines and Minerals Geologic Report 17, 32 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.
Maas, K.M., Still, J.C., Clough, A.H., and Oliver, L.K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: southern Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 33-91, 139 p., 12 sheets, scale 1:63,360.
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, 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|