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Lake

Prospect in Alaska, United States with commodities Copper, Lead
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Geologic information

Identification information

Deposit ID 10000161
MRDS ID A010197
Record type Site
Current site name Lake

Geographic coordinates

Geographic coordinates: -130.27565, 56.05671 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Texas Creek Granodiorite
    Rock description Texas Creek Granodiorite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock
    Rock unit name Hazelton Group
    Rock description Hazelton Group

Nearby scientific data

(1) -130.27565, 56.05671
ListMap

Comments on the geologic information

  • 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.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010197
USGS Alaska Resource Data File ARDF BC034

Bibliographic references

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = Prospect originally staked in 1923.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey