|Quadrangle map, 1:250,000-scale||SD|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is about 1.3 miles south-southeast of the middle of the narrows between the head of Port Houghton and the Salt Chuck east of it. It is about 1.1 mile west of hill 2015 and 0.5 mile southeast of the center of section 29, T. 52 S., R. 77 E. The location is accurate.|
The Louise prospect was found considerably before 1925 (Wright and Wright, 1906; Buddington, 1925); there has probably been no work since, although it has been claimed several times (Still and others, 2002). The workings consist of three open cuts and two short adits. The main adit has 248 feet of drift and crosscuts; it was mapped by Still and others (2002, Figure 26).The deposit occurs in undifferentiated garnet-quartz-biotite gneiss and amphibolite of Cretaceous to Permian age (Gehrels and Berg, 1992; Still and others, 2002.) The mineralization consists of lenses and disseminations of pyrrhotite and chalcopyrite, with some pyrite and magnetite. The best mineralization is associated with a secondary fault zone that strikes N20W and dips 66W, but the sulfides are also disseminated through the gneiss. The richest sample collected by Still and others (2002) contained 4,899 parts per million copper, but Buddington (1925) reports a sample with 1.34 percent copper.
|Geologic map unit||(-133.088258606782, 57.3276407210627)|
|Mineral deposit model||Chalcopyrite in gneiss and amphibolite.|
|Age of mineralization||In gneiss and amphibolite of Cretaceous to Permian age.|
|Workings or exploration||The workings consist of three open cuts and two short adits. The main adit has 248 feet of drift and crosscut.|
|Indication of production||None|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Buddington, A.F., 1925, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 773-B, p. 71-139.
Gehrels, G.E., and Berg, H.C., 1992, Geologic map of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-1867, 24 p., 1 sheet, scale 1:600,000.
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 Grybeck (U.S. Geological Survey)|
|Last report date||10/8/2004|