Outwash Southwest

Occurrence, Inactive

Commodities and mineralogy

Main commodities Pb; Zn
Ore minerals galena; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KL
Quadrangle map, 1:63,360-scale A-4
Latitude 68.1526
Longitude -155.2492
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 6.5 miles northwest of the small lake at the divide between a tributary to Kakivilak Creek and head of Itilyiargiok Creek. It is about 0.6 mile southeast of the center of section 20, 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 shale and minor graywacke sandstone of the Upper Devonian, Hunt Fork Shale. The occurrence consists of rubblecrop of silicified sandstone and conglomerate with sphalerite, galena and pyrite. Samples contained up to 2.8 percent zinc and 0.62 percent lead (Kurtak and others, 1995). The extent of the mineralization was not determined.
Geologic map unit (-155.252070140058, 68.1521141004013)
Mineral deposit model Disseminated lead-zinc mineralization in sandstone.
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 The sandstone host rock is silicified.

Production and reserves

Workings or exploration Only limited sampling and mapping 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.

References