Unnamed (north of Noatak River)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Sn
Other commodities Ag; As; Au; Be; Bi; Sb; Zn
Ore minerals chalcopyrite; galena; sphalerite; pyrrhotite
Gangue minerals calc-silicate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale C-5
Latitude 67.55
Longitude -155.01
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is a composite of three occurrences (localities 23-25 of Grybeck and Nelson, 1981) in an area of about 10 square miles north of the Noatak River and south of Mt. Papiok. The coordinates are for the center of an area, in sec. 22, T. 25 N., R. 17 E., of the Kateel River Meridian. Location of area accurate to within 2000 ft.

Geologic setting

Geologic description

The occurrences at the site are contact-metamorphic deposits in Paleozoic phyllite and limestone over a dome of Devonian gneissic granite that is exposed on the north bank of the Noatak River. Three small mineral occurrences have been documented (Grybeck and Nelson, 1981). They include quartz vein rubble and skarn containing various combinations of ore minerals including galena, chalcopyrite, pyrrhotite, and sphalerite. Select samples contain up to 480 ppm Ag, 3.5 ppm Au, 5,000 ppm As, 150 ppm Be, 150 ppm Bi, and 100 ppm Sn. The occurrences are similar to those at SP009, and to other contact metamorphic deposits elsewhere in the Brooks Range (Newberry and others, 1986).
Geologic map unit (-155.012782852538, 67.5494985418381)
Mineral deposit model Skarn (Cox and Singer, 1986; model 14b)
Mineral deposit model number 14b
Age of mineralization Related to the intrusion of the Devonian pluton.
Alteration of deposit Quartz and calc-silicate minerals.

Production and reserves

Workings or exploration Samples were mostly collected during spot stops and short traverses during geologic mapping by the USGS in the late 1970s.
Indication of production None

Additional comments

Located within Gates of the Arctic National Park.

References