Unnamed (near Bluecloud Mountain)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Pb
Ore minerals galena; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-1
Latitude 67.4004
Longitude -150.4324
Nearby scientific data Find additional scientific data near this location
Location and accuracy Kurtak and others (2002) reported that WGM Inc. found disseminated galena on the north side of Bluecloud Mountain and subsequently drilled a strong geophysical anomaly on the south side of the mountain. apparently near the coordinates given above. The details of the location are vague. The site is probably in the northwest quarter of section 27 or the southwest quarter of section 22, T. 30 N., R. 13 W.

Geologic setting

Geologic description

Bluecloud mountain is cut by the Wiseman fault which thrusts Proterozoic(?) or Paleozoic(?) quartzite and graphitic schist over Devonian schist, phyllite, sandstone, and conglomerate (Dillon and Reifenstuhl, 1990). The Devonian phyllite probably correlates with the Devonian Hunt Fork Shale to the north.
In following up geochemical anomalies identified in 1975, WGM Inc. found disseminated galena along faults on the north side of Bluecloud Mountain. (Kurtak and others, 2002). Subsequent geophysical surveys identified a strong EM anomaly on the south slope of Bluecloud Mountain. One 150-foot hole was drilled in 1978. A small amount of field work and sampling by ASA Inc. followed in 1992; they concluded that the earlier WGM geochemical anomalies only reflected background. There apparently has been no work by industry since. Kurtak and others (2002) found little signs of mineralization other than disseminated pyrite and pyrite in schist. None of their samples contained notable metals.
Geologic map unit (-150.435144955062, 67.399967639066)
Mineral deposit model No definitive information.
Age of mineralization No definitive information; could be as old as Proterozoic.
Alteration of deposit None noted.

Production and reserves

Workings or exploration From 1971 to 1983, WGM inc. conducted geochemical and geophysical surveys, mapped, sampled, and drilled one 150-foot hole (WGM 1976; WGM 1978; WGM, 1979; Nicol, 1983). ASA Inc. reviewed the information in 1992 and collected some samples. The Bureau of Land Management briefly examined the property and collected a few samples in about 2000 (Kurtak and others, 2002).
Indication of production None
Reserve estimates None.
Production notes None.

References

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, v. 1 and 2, 845 p.
Nichol, D.L., 1983, Evaluation of the mineral potential of Doyon Ltd.'s Blocks 5 and 22: Unpublished report 83-04 for Doyon Ltd. (on file at Doyon Ltd., Fairbanks, Alaska).
WGM Inc., 1976, Doyon Project, 1975 annual progress report, volume 1: Doyon, Ltd. Report 76-05a, 169 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
WGM Inc., 1978, 1977 Annual progress report, Doyon Ltd. project, v. III, west Wiseman Block 5: Doyon Ltd. Report 78-06, 13 p. (Report held by Doyon Ltd., Fairbanks, Alaska)
WGM Inc., 1979, Doyon Ltd. annual progress report, Block 5, general, southern Block 5, and Bluecloud base-metal anomalies: Doyon Ltd. Report 79-17 for Doyon Ltd., 5 p. (Report held by Doyon Ltd., Fairbanks, Alaska.)
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 2/1/2011