Unnamed (near head St. Patricks Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Ore minerals chalcopyrite; galena
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale D-1
Latitude 67.9114
Longitude -150.4613
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on a ridge at an elevation of about 5,200 feet, about 0.6 mile east of the small lake at the head of St. Patricks Creek. It is about 0.3 mile south-southeast of the center of section 27, T. 36 N., R. 13 W. The location is accurate.

Geologic setting

Geologic description

This prospect on the Lucky Boy claims was staked in 1963, again sometime in the 1970s, and was examined by the Bureau of Land Management in about 2000. The rocks in the area are Cambrian to Ordovician?), andesitic to basaltic volcaniclastic rocks, locally accompanied by tuffaceous phyllite, gabbro, diabase, and black phyllite (Dillon and others, 1986). There is little mineralization. On the ridgetop, numerous quartz-carbonate segregations with galena and chalcopyrite occur in the noses of folds in phyllite. On the east side of the ridge, iron-oxide-stained mudstone is coated with malachite and azurite. The highest values in the several samples collected by Kurtak and others (2002) was 62 parts per million (ppm) lead, 824 ppm copper, and 130 ppm zinc. WGM (1978) reported that samples contained gold and platinum-group elements, but none of the samples collected by Kurtak and other (2002) contained gold and they were not analyzed for the platinum-group elements.
Geologic map unit (-150.46407912378, 67.9109807920377)
Mineral deposit model Galena-chalcopyrite-quartz segregations.
Age of mineralization Cambrian to Ordovician(?) or younger based on the age of the host rocks.
Alteration of deposit None noted.

Production and reserves

Workings or exploration None other than the several claims that were staked by industry and limited sampling by the Bureau of Land Management in about 2000.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

Now in the Gates of the Arctic National Park which is closed to prospecting and mining.

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, 2 vols., 845 p.
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 2/1/2011