Lake

The Lake is a copper and lead mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Lake

Commodity

Primary: Copper
Primary: Lead

Location

State: Alaska
District: Hyder

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = Prospect originally staked in 1923.

Comment (Reference): Primary Reference = Berg and others, 1977

Comment (Workings): Workings / 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.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = 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.

Comment (Deposit): Model Name = Polymetallic veins

References

Reference (Deposit): 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.

Reference (Deposit): Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

Reference (Deposit): Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Buddington, A.F., 1925, Mineral investigations in southeastern Alasaka: U.S. Geological Survey Bulletin 773, p. 71-139.

Reference (Deposit): Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.

Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

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