Ginger

Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10001398
MRDS ID A012141
Record type Site
Current site name Ginger

Geographic coordinates

Geographic coordinates: -149.28334, 67.70972 (WGS84)
Relative position This site is at an elevation of about 4,550 feet on the ridge between Big Spruce Creek and Sheep Creek (NE1/4 sec. 11, T. 33 N., R. 8 W., of the Fairbanks Meridian) approximately 5 miles northwest of Horace Mountain. The location is accurate within a 1/2-mile radius.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Pyrite Ore

Alteration

  • (Local) Calc-silicate.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

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

Nearby scientific data

(1) -149.28334, 67.70972

Comments on the geologic information

  • Geologic Description = The Ginger prospect is one of a number of skarn prospects in the Chandalar area. Published information specific to the geology of individual skarns is scarce. Early reports described the Ginger prospect as copper sulfides and/or malachite-azurite stains in a thrust fault-bounded block of Skajit Limestone, along with isolated tactite bodies containing less than 0.2 percent Cu. Later descriptions by Newberry and others (1986) included the Ginger prospect in a group of skarn deposits northwest of a belt of Devonian(?) granitic rocks informally named the Horace Mountain plutons. Many of these skarns exhibit both garnet/pyroxene prograde and epidote/actinolite retrograde mineral assemblages. Newberry and others (1986) stated that the mineralogy, mineralization, and alteration of these skarns tend to place them in the category of continental-margin, porphyry-related copper skarns. A notation on the Newberry and others (1986) prospect location map classified the Ginger prospect as a Cu-Ag skarn. The prospect is located in an area mapped by Dillon and others (1996) as Devonian tactite and Devonian aplite (a component of the Horace Mountain plutonic assemblage), within a more extensive terrane of phyllite and marble. Newberry and others (1986) described the mineralogy of a hand specimen from this prospect as epidote, actinolite, chalcopyrite, pyrite and magnetite and the metal content as 7.8 percent Cu and 57 ppm Ag. In a listing posted on the Ventures Resource Corporation (currently exploring Doyon lands in the area under an exploration agreement with Doyon, Limited) website (URL http://www.venturesresource.com/), the Ginger prospect is noted as a Cu prospect.
  • Age = Devonian based on reported Early Devonian Pb/Pb zircon ages from the associated Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Not determined

Mining district

District name Koyukuk

Comments on the workings information

  • Workings / Exploration = Eight lode claims staked in 1969-70.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012141
USGS Alaska Resource Data File ARDF CH060

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

    Adams, D.D., and Dillon, J.T., 1985, Geochemical investigations in the Chandalar C-5 and C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 85-26, 37 p., 3 sheets, scale 1:63,360. (Superseded by RI 88-15.)

  • Deposit

    Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

  • Deposit

    Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

  • Deposit

    Maas, K.M., 1987, Maps summarizing land availability for mineral exploration and development in northern Alaska, 1986: U.S. Bureau of Mines Open-File Report 10-87, 33 sheets.

  • Deposit

    Adams, D.D., and Dillon, J.T., 1985, Geochemical investigations in the Chandalar C-5 and C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 85-26, 37 p., 3 sheets, scale 1:63,360. (Superseded by RI 88-15.)

Comments on the references

  • Primary Reference = Newberry and others, 1986

General comments

Subject category Comment text
Deposit Model Name = Cu skarn deposits (Cox and Singer, 1986; model 18b)
Deposit Other Comments = See also: Evelyn Lee (CH059), Hurricane-Diane (CH062), and Luna (CH101). Alaska Kardex No. 031-53H (Kardex is a card file mining claim information system located at the State of Alaska DNR Public Information Center in Fairbanks).

Reporter information

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