|Quadrangle map, 1:250,000-scale||BC|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Lake prospect is at an elevation of about 2400 feet along an old trail in the southwest corner of Section 16, about 0.2 mile northeast of Disappearing Lake (Berg and others, 1977, p. 84; Elliott and Koch, 1981, p. 12, loc. 34). The location is accurate within about a quarter of a mile.|
The country rock in the area of the Lake prospect is the Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group (Smith, 1977; Berg and others, 1977, p. 17-18; Koch, 1996).
Buddington (1925, p. 74; 1929, p. 101) describes the deposit as a quartz fissure vein 11 inches thick in Texas Creek Granodiorite just below the contact of Hazelton metasedimentary rocks. The footwall of the vein contains abundant galena and subordinate pyrite.Berg and others (1977, p. 38-39, 84) describe a quartz vein about 3 feet thick in Texas Creek Granodiorite just below the Hazelton contact. About 12 inches of the footwall of the vein contains pyrite, galena, and microscopic traces of chalcopyrite, whereas the upper part of the vein is almost barren. A sample across the width of the vein assayed 35 ppm Cu, 35 ppm Pb, and 25 ppm Zn.
|Geologic map unit||(-130.275705477661, 56.0566882024577)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Workings or exploration||
The Lake prospect was originally staked in 1923 and explored by a few small pits, most of which are caved or overgrown.A sample collected in 1972 by the U.S. Bureau of Mines (Berg and others, 1977) across the width of the vein assayed 35 ppm Cu, 35 ppm Pb, and 25 ppm Zn.
|Indication of production||None|
Additional commentsProspect originally staked in 1923.
Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords Wilderness Study Area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.
|Reporters||H. C. Berg (Fullerton, California)|
|Last report date||5/17/1998|