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  3. Alaska Resource Data File (ARDF)

Unnamed (south of the Hammond River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities As; Cu; Sb; Zn
Ore minerals azurite; chalcopyrite; galena; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale C-6
Latitude 67.6246
Longitude -149.9863
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,300 feet, on a ridge south of the Hammond River, approximately 6.5 miles west-northwest of Sukakpak Mountain and 5.5 miles north of Jennie Creek Lake. It is about 0.3 mile southwest of the center of section 3, T. 32 N., R. 11 W. The location is accurate within one mile.

Geologic setting

Geologic description

This occurrence was originally described as copper sulfides and malachite-azurite staining in Middle to Upper Devonian(?) conglomerate interbedded in black slate, phyllite, and chloritic siltstone of the Beaucoup Formation (Dillon and Reifenstuhl, 1995). Kurtak and other (2002) describe a quartz vein 1 to 4 inches thick, with trace chalcopyrite and galena, that crosscuts quartz-muscovite schist. Two samples contained up to 356 parts per million (ppm) antimony, 140 ppm arsenic, and 580 ppm zinc, but they were not analyzed for copper and lead.
Geologic map unit (-149.989061054065, 67.6241829591779)
Mineral deposit model Quartz vein with chalcopyrite and galena.
Age of mineralization Late Devonian or younger based on the age of the host rock.
Alteration of deposit Not noted.

Production and reserves

Workings or exploration Only limited sampling by government agencies.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

This occurrence is in the Gates of the Arctic National Park which is closed to prospecting and mining.
MAS No. 0020310094

References

MRDS Number A012154

References

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.
Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.
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.
Dillon, J.T., and Reifenstuhl, R.R., 1995, Geologic map of the Chandalar C-6 quadrangle, southeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 105, 1 sheet, scale 1:63,360.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010