Outwash Southeast

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Cu
Ore minerals galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KL
Quadrangle map, 1:63,360-scale A-4
Latitude 68.1487
Longitude -155.2332
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 6.0 miles northwest of the small lake at the divide between a tributary to Kakivilak Creek and head of Itilyiargiok Creek. It is about 0.5 mile north-northeast of the center of section 26, T. 32 N., R. 16 E. The location is accurate to within about a half mile.

Geologic setting

Geologic description

The rocks in the area are Upper Devonian, Hunt Fork Shale and Noatak Sandstone. In a follow-up investigation of geochemical samples collected by the U.S. Geological Survey (Sutley and others, 1984), the Bureau of Mines discovered quartz-cemented breccia and quartz veins with galena and pyrite (Kurtak and others, 1995). A select sample of quartz-cemented breccia in shale contained 25 percent lead and 352 grams of silver per tonne. Another select sample of rubblecrop contained 7.3 percent lead, 9.3 percent zinc, more than 50 parts per million (ppm) silver, and 785 ppm copper. The extent of the mineralization was not determined.
Geologic map unit (-155.236069483142, 68.1482142880225)
Mineral deposit model Silver-lead-zinc-quartz veins.
Age of mineralization Late Devonian or younger based on the age of the host rock. Possibly Late Jurassic to Cretaceous based on analogy with other deposits in the western Brooks Range.
Alteration of deposit Not noted.

Production and reserves

Workings or exploration Only limited sampling by the U.S. Geological Survey and U.S. Bureau of Mines.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

The occurrence is in the Gates of the Arctic National Park which is closed to prospecting and mining.
MAS No. 002010009

References