Ginger

Site Name

Primary: Ginger

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Commodity

Primary: Copper

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Location

State: Alaska
District: Koyukuk

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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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Skarn Cu

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Calc-silicate.

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Rocks

Name: Limestone
Role: Host
Age Type: Host Rock Unit
Age Young: Late Devonian

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Analytical Data

Not available

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Materials

Ore: Chalcopyrite
Ore: Magnetite
Ore: Pyrite

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Comments

Comment (Geology): 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).

Comment (Geology): 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.

Comment (Exploration): Status = Not determined

Comment (Workings): Workings / Exploration = Eight lode claims staked in 1969-70.

Comment (Reference): Primary Reference = Newberry and others, 1986

Comment (Deposit): Model Name = Cu skarn deposits (Cox and Singer, 1986; model 18b)

Comment (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).

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References

Reference (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.

Reference (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.

Reference (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.

Reference (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.)

Reference (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.

Reference (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.

Reference (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.

Reference (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

Reference (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.)

Reference (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.

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