Unnamed (north of Inyuilak Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Bi; Cu; Sn; Zn

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale B-4
Latitude 67.311
Longitude -154.9491
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 4000 feet on a ridge 3 miles north of Inyuilak Creek. It is in the N1/2 of sec. 18, T. 22 N., R. 18 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. The site corresponds to locality 44 of Grybeck and Nelson (1981).

Geologic setting

Geologic description

This occurrence is a contact metamorphic deposit at the contact of Devonian granite and Paleozoic schist (Grybeck and Nelson, 1981). Selected samples contain up 5 ppm Ag, 100 ppm Bi, 1 percent Cu, 30 ppm Sn, and 700 ppm Zn. The deposit is related to intrusion of the granite and is similar to other contact-metamorphic deposits in the Brooks Range (Newberry and others, 1986).
Geologic map unit (-154.951851134845, 67.3104919765669)
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 briefly 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 10308333

References

Reporters S.W. Nelson (Anchorage, Alaska)
Last report date 9/21/1999