Unnamed (near Dome Creek)

Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10001850
MRDS ID A012666
Record type Site
Current site name Unnamed (near Dome Creek)

Geographic coordinates

Geographic coordinates: -164.62024, 64.89237 (WGS84)
Relative position This prospect is north of Dome Creek at an elevation of about 1,500 feet. It is locality 4 of Asher (1969, DGGS R18) and locality 8 of Cobb (1972, MF 445; 1978, OF 78-181).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Azurite Ore
Malachite Ore
Quartz Gangue

Alteration

  • (Local) Silicification (?) and oxidation; the development of silica-rich rocks at or near the base of Paleozoic marble characterizes this type of copper occurrence.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -164.62024, 64.89237

Comments on the geologic information

  • Geologic Description = Several small showings of malachite- and azurite-bearing quartz-rich zones were exposed in open cuts prior to 1908 (Smith, 1908). The copper minerals occur as fracture coatings and drusy fillings in quartz. This deposit is one of many occurrences of copper mineralization in silica-rich rocks near the regional contact of marble in a lower Paleozoic metasedimentary assemblage with pelitic schist of possible Cambrian or Precambrian age (Till and others, 1986). This type of copper occurrence is present at several localities in the western Solomon quadrangle (Gamble, 1988) and has similarities to several in the Kougarok area of the northeastern Teller quadrangle. In the Teller quadrangle, the Ward mine (TE071) is an example of this type of copper mineral occurrence. The Ward mine has been described as a zone of silicification in marble above a thrust contact with underlying metapelitic schist (Sainsbury and others, 1969; Sainsbury, 1975, p. 90-94). The silica-rich rocks have been metamorphosed and commonly have a laminar fabric. Copper-bearing minerals, mostly malachite but also including azurite, and in places chalcopyrite and possibly bornite, are disseminated in the silica-rich rocks. The minor sulfides tend to be along faint laminae and joints (Sainsbury and others, 1969, p. 22). Malachite and azurite also occur in small veins and veinlets in the silica-rich rocks. The summary characterization of this type of Seward Peninsula mineral deposit by Sainsbury (1975, p. 90-94) contains inconsistencies with some descriptions of these deposits. Their origin is uncertain and other possibilities should be considered. One possiblity is that the silica-rich rocks are quartzites and that there is a stratigraphic control to the Ward deposit and similar occurrences elsewhere on Seward Peininsula. Quarzite at the base of the regional carbonate assemblage is recognized elsewhere in the Kougarok Mountain area (Puchner, 1986, p. 1777).
  • Age = Unknown; if stratigraphic controls are important then it is probably Paleozoic in age.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Kougarok; Iron Creek

Comments on the workings information

  • Workings / Exploration = Several open cuts and shallow prospect pits are present in area.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012666
USGS Alaska Resource Data File ARDF SO112

Bibliographic references

  • Deposit

    Smith, P.S., 1908, Investigations of mineral deposits of Seward Peninsula: U.S. Geological Survey Bulletin 345, p. 206-250.

  • Deposit

    Sainsbury, C.L., Kachadoorian, Reuban, Hudson, Travis, Smith, T.E., Richards, T.R., and Todd, W.E., 1969, Reconnaissance geologic maps and sample data, Teller A-1, A-2, A-3, B-1, B-2, B-3, C-1, and Bendeleben A-6, B-6, C-6, D-5, and D-6 quadrangles. Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 377, 49 p., 12 sheets, scale 1:63,360.

  • Deposit

    Asher, R.R., 1969, Geology and geochemistry of part of the Iron Creek area, Solomon D-6 quadrangle, Seward Peninsula, Alaska: Alaska Division of Mines and Geology Geochemistry Report 18, 19 p.

  • Deposit

    Cobb, E.H., 1972, Metallic resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, scale 1:250,000.

  • Deposit

    Sainsbury, C.L., 1975, Geology, ore deposits, and mineral potential of the Seward Peninsula, Alaska: U.S. Bureau of Mines Open-File Report 73-75, 108 p., 3 sheets, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

  • Deposit

    Puchner, C.C., 1986, Geology, alteration, and mineralization of the Kougarok Sn deposit, Seward Peninsula, Alaska; Discussion reply: Economic Geology, v. 82, p. 2201-2204.

  • Deposit

    Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Smith, 1908

General comments

Subject category Comment text
Deposit Model Name = Copper-bearing mineralization in silica-rich zones at or near base of marble.

Reporter information

Type Date Name Affiliation Comment
Reporter 19-AUG-1999 Travis L. Hudson Applied Geology