Unnamed

Occurrence in Alaska, United States with commodities Copper, Silver, Gold

Geologic information

Identification information

Deposit ID 10000170
MRDS ID A010205
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -130.39482, 56.04671 (WGS84)
Relative position This unnamed occurrence is in Section 22 at an elevation of about 2000 feet on the northwest flank of Banded Mountain (Berg and others, 1977, p. 133 and plate 1; Cobb, 1978, p. 87; Elliott and Koch, 1981, p. 8. loc. 16). The location is probably accurate to within about a quarter of a mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrrhotite Ore
Quartz Gangue

Alteration

  • (Local) Graywacke hostrock is conspicuously iron stained.

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 Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone

Nearby scientific data

(1) -130.39482, 56.04671

Comments on the geologic information

  • Geologic Description = The country rock in the general area of this occurrence is graywacke of the Jurassic or older Mesozoic Hazelton Group (Berg and others, 1977, p. 15 and plate 1). A field investigation in 1973 by the U.S. Bureau of Mines (Berg and others, 1977, p. 133) reported that the deposit consists of a quartz pod that contains pyrrhotite and traces of chalcopyrite, in conspicuously iron-stained graywacke. The pod is about 2 feet thick and probably no more than 20 feet long; it pinches out at either end.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • Workings / Exploration = A channel sample taken by the U. S. Bureau of Mines in 1973 across the thickest part of the quartz pod containing the most abundant sulfides assayed 1200 ppm Cu and 1.5 ppm Ag. A grab sample of a smaller pod about 6 inches thick contained a similar amount of Ag, much less Cu, and 0.05 ppm Au.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010205
USGS Alaska Resource Data File ARDF BC016

Bibliographic references

  • 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

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-922, 98 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.

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein
Deposit Other Comments = Twenty or more claims were staked in 1928 or 1929 on the northwest side of Banded Mountain, but it is not known whether they included this occurrence.? the site is in Misty Fiords National Monument.

Reporter information

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