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  3. Alaska Resource Data File (ARDF)

Unnamed (near Wiehl Mountain)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Ag; As; Au; Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; gold; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale C-6
Latitude 67.6576
Longitude -149.5105
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at elevation of about 3,600 feet, about 3.9 miles north-northeast of Wiehl Mountain (peak 5765). It is about 0.2 mile northeast of the center of section 26, T. 33 N., R. 9 W. The location is accurate to within a half mile.

Geologic setting

Geologic description

This occurrence was originally described as galena in Devonian(?) greenstone and greenschist near a contact with Devonian siltstone and grit (Brosgé and Reiser, 1964). Mulligan (1974) and Kurtak and others (2002) found a 3-foot-wide quartz vein exposed for 100 feet along strike. No sulfides were seen in place in the quartz vein but there is abundant quartz float in talus below the vein with 2 to 3 percent disseminated pyrite, arsenopyrite, chalcopyrite, galena, and sphalerite. Three samples averaged 72 parts per billion gold, 2.1 parts per million (ppm) silver, 258 ppm copper, 1,260 ppm lead, 303 ppm zinc, and 3,454 ppm arsenic.
Geologic map unit (-149.513261413478, 67.6571946597778)
Mineral deposit model Polymetallic quartz vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c

Production and reserves

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

Additional comments

MAS No. 0020310132

References

MRDS Number A012146

References

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.
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.
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., 1982, Source of lode and placer gold deposits of the Chandalar and upper Koyukuk Districts: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-158, 25 p., 1 sheet, scale 1:250,000.
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.
Mulligan, J.J., 1974, Mineral resources of the Trans-Alaska Pipeline corridor: U.S. Bureau of Mines Information Circular 8626, 24 p., 9 sheets, scale 1:250,000.
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010