Snowden Creek

Occurrence in Alaska, United States with commodities Copper, Yttrium

Geologic information

Identification information

Deposit ID 10001406
MRDS ID A012150
Record type Site
Current site name Snowden Creek
Related records 10111638

Geographic coordinates

Geographic coordinates: -149.71337, 67.75971 (WGS84)
Relative position The Snowden Creek occurrence is approximately 3 miles south-southwest of Snowden Mountain. It is near the 3,000-foot level of a ridge immediately north of lower Snowden Creek and overlooking the Dietrich River (sec. 24, T. 34 N., R. 10 W., of the Fairbanks Meridian). The location is accurate within a 1/2-mile radius.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Yttrium Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Gypsum Ore
Pyrite Ore
Calcite Gangue
Graphite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Stratigraphic age (youngest) Late Devonian

Nearby scientific data

(1) -149.71337, 67.75971

Comments on the geologic information

  • Geologic Description = This occurrence consists of: (a) a 6-inch-thick gypsum-calcite zone in shaley limestone which contains abundant fine-grained pyrite; and (b) vein quartz float that contains traces of graphite, pyrite, and chalcopyrite (Mulligan, 1974). Dillon and others (1988) mapped the country rocks as a Devonian igneous unit of diabase, gabbro, and diorite dikes and sills that is in contact with Middle Ordovician black, carbonaceous phyllite and meta-limestone. Calc-silicate hornfels occurs along the contact. Cr, Pb, Ni, and V were detected spectrographically in samples from the occurrence (Mulligan, 1974).

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 A012150
USGS Alaska Resource Data File ARDF CH105

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

    Mulligan, J.J., 1974, Mineral resources of the Trans-Alaska Pipeline corridor: U.S. Bureau of Mines Information Circular 8626, 24 p.

  • 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

    U.S. Bureau of Mines, 1978, Mineral appraisal of the proposed Gates of the Arctic Wilderness National Park, Alaska, A preliminary comment: U.S. Bureau of Mines Open-File Report 109-78, 29 p., 4 sheets.

Comments on the references

  • Primary Reference = Mulligan, 1974

Reporter information

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