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Siwash Creek

Occurrence in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10001380
MRDS ID A012122
Record type Site
Current site name Siwash Creek
Related records 10135734

Geographic coordinates

Geographic coordinates: -149.40327, 67.1197 (WGS84)
Relative position The occurrence is at an elevation of about 2,100 ft in hills above the first significant fork in Siwash Creek upstream from its mouth and approximately 4 1/2 miles south-southwest of Boatman Pass. It is 17 1/4 miles east-southeast of the Myrtle Creek landing strip (SW1/4 sec. 31, T. 27 N., R. 8 W., of the Fairbanks Meridian). The location is accurate within a 1-mile radius.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Ore Material = Copper sulfides (unspecified) and/or malachite/azurite

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert

Nearby scientific data

(1) -149.40327, 67.1197
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Comments on the geologic information

  • Geologic Description = This occurrence is described very generally as Cu sulfides and/or malachite-azurite stains and is located in an area mapped as a small body of chert within a Devonian(?) volcanic rock and chert unit (DeYoung, 1978). No other descriptive information is available.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Koyukuk

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012122
USGS Alaska Resource Data File ARDF CH002

Bibliographic references

  • Deposit

    Brosgi, W.P., and Reiser, H.N., 1964, Geologic map and section of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1-375, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-457, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.

  • Deposit

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.

  • Deposit

    Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.

Comments on the references

  • Primary Reference = Brosgi and Reiser, 1964

General comments

Subject category Comment text
Deposit Other Comments = See also: West Fork occurrence (CH001).

Reporter information

Type Date Name Affiliation Comment
Reporter 17-NOV-1999 J.M. Britton U.S. Geological Survey