Unnamed (near VABM Pink)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Sb
Ore minerals azurite; chalcocite; galena; malachite; tetrahedrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale C-5
Latitude 67.5142
Longitude -152.3057
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 3,700 feet , about 0.5 mile northwest of VABM Pink, in the NE1/4 section 18, T. 31 N., R. 21 W. The prospect is the location of sample 518 in Dillon and others (1981). The location is accurate.

Geologic setting

Geologic description

This rocks in the vicinity of this prospect are marble of the Middle Devonian Skajit Limestone in fault contact with calcareous schist and mudstone of the Upper Devonian Hunt Fork Shale (Dillon and others, 1986). Dillon and others (1981) identified a vein, more than 2 centimeters thick, of azurite, malachite, and chalcocite, in a unit of metamorphosed conglomerate, sandstone and shale, below marble. A sample of the vein contained 66.4 percent copper and 21.7 parts per million (ppm) silver.
Kurtak and others (2002) examined the site as part of a regional mineral resource assessment and collected several samples. Several pieces of quartz float contained minor amounts of tetrahedrite(?), with rims of malachite and galena. A sample contained 1,744 ppm lead, 921 ppm antimony, and 585 ppm copper. Prior to the mid-1970s, at least five companies including Bear Creek Mining Company, General Crude Oil Company, New Jersey Zinc Company, Alvenco Inc., and BP Alaska prospected and sampled in the area as part of their work in a 5-mile-long, northeast-trending belt of mineral occurrences along a thrust fault. (Degenhart, and others, 1978).
Geologic map unit (-152.308461942471, 67.5137394658461)
Age of mineralization Devonian or younger based on the age of the host rock.
Alteration of deposit Oxidation of copper minerals.

Production and reserves

Workings or exploration Prior to the mid-1970s, at least five companies including Bear Creek Mining Company, General Crude Oil Company, New Jersey Zinc Company, Alvenco Inc., and BP Alaska prospected and sampled in the area as part of their work in a 5-mile-long, northeast-trending belt of mineral occurrences along a thrust fault. (Degenhart, and others, 1978). Examination and limited surface sampling by the Alaska Division of Geological and Geophysical Surveys (Dillon and others, 1981) and the Bureau of Land Management (Kurtak and others, 2002).
Indication of production None
Reserve estimates None.
Production notes None.

References

MRDS Number A011998

References

Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, 2 vols., 845 p.
WGM, 1976, 1975 Annual progress report Alaska project, Part III Wiseman quadrangle, Part IV Heady-Fairbanks area: unpublished report, p. 68-69 (Report held by Doyon Ltd., Fairbanks, Alaska).
Reporters J.M. Britton (Anchorage); D.J. Grybeck (Contractor, USGS)
Last report date 2/1/2011