Unnamed (north end of Greenstone Ridge)

Site Name

Primary: Unnamed (north end of Greenstone Ridge)

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Commodity

Primary: Copper

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Location

State: Alaska
District: Aniak

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Role: Host
Age Type: Host Rock
Age Young: Jurassic

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Analytical Data

Not available

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Materials

Not available

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Comments

Comment (Deposit): Model Name = Copper-bearing minerals in fault zone.

Comment (Geology): Age = Not known; postdates host Jurassic volcanic rocks.

Comment (Geology): Geologic Description = Hoare and Coonrad (1959) reported traces of copper minerals in a fault zone in green amphibole schist derived from Jurassic mafic volcanic rocks. It appears that this site is along or near the high-angle reverse fault mapped along the west side of Greenstone Ridge (Box and others, 1993). Hoare and Cobb (1977, p. 16) note that this occurrence may also have been referred to in the literature under the names Golden Butte Mines, Inc., Rigagalik River, and Royal Quartz Mines. The Golden Butte Mines occurrence is reported to be quartz veins carrying some gold that were traceable for several hundred feet (Smith, 1932, B 824, p. 22). The Royal Quartz occurrence was reported to be in slate intruded by grainitic rocks, and to consist of shear zones with quartz veins that contained Sb, Au, and Ag (Brooks, 1912, p. 35). Geologically, neither the Royal Quartz or the Golden Butte Mines occurrences appears to be the same one as at this locality; they apparently were not located by Cobb (1972 [MF 455]) or Hoare and Cobb (1977). The Rigagalik River occurrence in the upper part of the Kisaralik River is described in a separate record (BH021).

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Limited surface observations appear to be the extent of activity at this locality.

Comment (Reference): Primary Reference = Hoare and Cobb, 1977

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References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Bethel quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-455, 1 sheet, scale 1:250,000.

Reference (Deposit): Hoare, J.M., and Coonrad, W.L., 1959, Geologic map of the Bethel quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-285, 1 sheet, scale 1:250,000.

Reference (Deposit): Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.

Reference (Deposit): Box, S.E, Moll-Stalcup, E.J., Frost, T.P., and Murphy, J.M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.

Reference (Deposit): Smith, P.S., 1932, Mineral industry of Alaska in 1929, in Smith, P.S., and others, Mineral Resources of Alaska in 1929: U.S. Geological Survey Bulletin 824, p. 83-109.

Reference (Deposit): Brooks, A.H., 1912, The Alaska mining industry in 1911, in Brooks, A.H., and others, Mineral resources of Alaska, 1911: U.S. Geological Survey Bulletin 520, p. 17-44.

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