Unnamed (west of Awlinyak Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Bi; Cu; Sn
Other commodities F
Ore minerals chalcopyrite; fluorite; malachite

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale B-3
Latitude 67.489
Longitude -154.453
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 4300 feet near the headwaters of an unnamed creek 3 miles west of Awlinyak Creek. It is in the SE1/4 of sec. 8, T. 24 N., R. 20 E., of the Kateel River Meridian. Accuracy of the location is within 1000 ft. The site corresponds to locality 31 of Grybeck and Nelson (1981).

Geologic setting

Geologic description

This occurrence consists of locally prominent copper staining in several cliffs near the contact of Devonian gneissic granite with Paleozoic chlorite schist and quartzite (Grybeck and Nelson, 1981). Grab samples that had visible fluorite and chlorite contained up to 3 ppm Ag, 300 ppm Bi, and 100 ppm Sn. A brief examination suggests that the occurrences are erratic and small. They probably are similar in origin to other Devonian contact-metamorphic deposits in nearby areas of the Brooks Range (Newberry and others, 1986).
Geologic map unit (-154.455786835668, 67.4885068184996)
Mineral deposit model Skarn (Cox and Singer, 1986; model 14b)
Mineral deposit model number 14b
Age of mineralization Devonian; related to the intrusion of Devonian pluton.

Production and reserves

Workings or exploration Site examined during regional geologic mapping by the USGS in the late 1970s.
Indication of production None

Additional comments

Located within Gates of the Arctic National Park.

References

MRDS Number 10308328

References

Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Reporters S.W. Nelson (Anchorage, Alaska)
Last report date 9/20/1999