Arctic

Site Name

Primary: Arctic
Secondary: Arctic Camp

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Commodity

Primary: Gold
Primary: Zinc
Primary: Lead
Primary: Silver
Primary: Copper
Secondary: Antimony

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Location

State: Alaska
District: Shungnak

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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: Massive sulfide, kuroko

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Chlorite-rich rocks in footwall and surrounding the sulfides form an alteration zone containing a complex assemblage of barian fluorphlogopite, talc, Mg-chlorite, barite, phengite, quartz, and calcite (Schmidt, 1986).

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Rocks

Name: Schist
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: Tetrahedrite
Ore: Chalcopyrite
Ore: Chalcocite
Ore: Bornite
Ore: Galena
Ore: Tennantite
Ore: Sphalerite
Ore: Stibnite
Gangue: Barite
Gangue: Talc
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Arsenopyrite
Gangue: Calcite
Gangue: Pyrite

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Comments

Comment (Geology): Age = Devonian-Mississippian

Comment (Exploration): Status = Active

Comment (Deposit): Model Name = Kuroko

Comment (Deposit): Other Comments = Artic is one of several volcanogenic deposits in the Ambler schist belt along the south flank of the Brooks Range. The deposits may be part of a rifted continental margin (Schmidt, 1981, p. 548).

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

Comment (Reserve-Resource): Reserves = Indicated reserves of 26 million tons grading 4.0% Cu, 5.5 % Zn, 1% Pb, 1.6 oz/ton (55 g/tonne) Ag, and 0.03oz./ton (0.69 g/tonne)Au (Eakins and others, 1985, p. 6).

Comment (Workings): Workings / Exploration = Explored by surface trenches and pits and diamond drill holes. Patented claims held by Kennecott Exploration. Extensive diamond drilling (more 65 holes) (Nana Development Corporation, written comm., 1997).

Comment (Geology): Geologic Description = A syngenetic deposit hosted in a thick sequence of low to medium grade metamorphosed basaltic and rhyolitic rocks, submarine ash flow tuffs, volcaniclastic and minor plutonic rocks, and pelitic, carbonaceous and calcareous sedimentary rocks, known as the Ambler schist belt. These rocks are part of a large fold structure termed the Kalurivik arch. A Devonian or Mississippian age of mineralization is based both on fossil evidence and U-Pb radiometric dating (Hitzman and others, 1986, p.1592-1618).?This polymetallic, stratabound, volcanogenic deposit consists of tabular masses of banded massive and disseminated sulfides, one foot (0.3 m) to more than 55 ft. (18 m) thick, composed of 20% to 90% pyrite, chalcopyrite and sphalerite, along with lesser amounts of pyrrhotite, chalcocite, bornite, galena, tennantite-tetrahedrite, arsenopyrite and stibnite. The sulfides are enclosed in calcareous talcose to quartzose lenses within a metavolcanic (rhyolitic) unit. The mineralized area is 3000 ft. by 2200 ft. (1030 m by 730 m), and about 270 ft. (90 m) thick. The massive sulfide occurrences are covered by a small gossan cap 9 ft. to 15 ft. (3 m to 5 m) deep (Schmidt, 1986, p. 1619-1643).

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References

Reference (Deposit): Schmidt, J.M., 1988, Mineral and whole-rock compositions of seawater-dominated hydrothermal alteration at the Arctic volcanogenic massive sulfide prospect, Alaska: Economic Geology, v. 83, p. 822-842.

Reference (Deposit): Schmidt, J.M., 1983, Geology and geochemistry of the Arctic prospect, Ambler district, Alaska: Stanford, Stanford University, Ph.D. dissertation, 253 p.

Reference (Deposit): Degenhart, C.E., Griffis, R.J., McQuat, J.F., and Bigelow, C.G., 1978, Mineral studies of the western Brooks Range performed under contract to the U.S. Bureau of Mines, Contract #JO155089: U.S. Bureau of Mines Open-File Report 103-78, 529 p., 11 sheets.

Reference (Deposit): Mayfield, C.F. and Grybeck, D., 1978, Mineral occurrences and resource map of the Ambler river quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-120I, 1 sheet, scale 1:250,000.

Reference (Deposit): Hitzman, M.W., Profett, J.M., Jr., Schmidt, J.M., and Smith, T.E., 1986, Geology and mineralization of the Ambler district, northwestern Alaska: Economic Geology, v. 81, p. 1592-1618.

Reference (Deposit): Dillon, J.T., Pessel, G.H., Chen, J.H., and Veach, N.C., 1979, Tectonic and economic significance of late Devonian and late Proterozoic U-Pb zircon ages from Brooks Range, Alaska: in Short Notes on Alaskan Geology, 1978: Alaska Division of Geological and Geophysical Surveys Geologic Report 61, p. 36-41.

Reference (Deposit): Grybeck, D.J., and Nokleberg, W.J., 1979, Metallogeny of the Brooks Range, Alaska, in Johnson, K.M., and Williams, J.R., Jr., The United States Geological Survey in Alaska: Accomplishments during 1978: U.S. Geological Survey Circular 804-B, p. B19-B22.

Reference (Deposit): Schmidt, J.M., 1986, Stratigraphic setting and mineralogy of the Arctic volcanogenic massive sulfide prospect, Ambler District, Alaska: Economic Geology and the Bulletin of the Society of Economic Geologists, vol.81, no.7, pp.1619-1643.

Reference (Deposit): Schmidt, J.M., 1981, Volcanogenic massive sulfide deposition in a rifted continental margin--The Arctic Camp deposit, southwestern Brooks Range, Alaska [abs.]: Geological Society of America Annual Meeting, Program with Abstracts, v. 13, no. 7, p. 548.

Reference (Deposit): Bottge, R.G., 1975, Impact of a natural gas pipeline on mineral and energy development in Alaska: U.S. Bureau of Mines Open-File Report 20-75.

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