Unnamed (west of Kivliktort Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Ba
Ore minerals barite; galena; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HW
Quadrangle map, 1:63,360-scale B-2
Latitude 68.3002
Longitude -156.6432
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 3.2 miles west-northwest of the summit of Kivliktort Mountain, near the center of section 31, T. 34 N., R. 10 E.

Geologic setting

Geologic description

The rocks in the area consist of Upper Devonian to Lower Mississippian, Kayayut Conglomerate and Kayak Shale(?). The mineralization is mostly in massive to crossbedded sandstone of the Kanayut Conglomerate but some is in red-brown, carbonate-cemented, interbedded sandstone, siltstone, coal, and shale that may be part of the Kayak Shale, or a lateral equivalent (Kurtak and others, 1995).
The mineralization is along a probable, southeast-dipping, low angle thrust-faulted zone at the base of Kivliktort Mountain (Kurtak and others, 1995). The structure in the area is complex and there are numerous repeated sections of the Kayayut Conglomerate and Kayak Shale. There are four types of mineralization: breccia, vein, replacement, and disseminated. The mineralization is accompanied by silicification and bleaching of the sandstone. Abundant mineralized float with galena and sphalerite extends over a northeast-trending area about 20 meters by 100 meters in size. Breccia along the thrust faults is cemented by quartz, sphalerite, and galena. Disseminated sphalerite occurs in sandstone near the thrust faults and sphalerite replaces coal. Sphalerite veins and late barite veins occur locally. Selected samples contained up to 31.5 percent zinc, 2.8 percent lead, and 26.1 grams of silver per tonne. There is considerable evidence for remobilization of the sulfides from what may have originally been a sandstone-type lead-zinc deposit. Lead isotope values from galena are: Pb 206/204 = 18.632; Pb 207/204 = 15.617, and Pb 208/204 = 38.353. These data suggest a Mississippian to Pennsylvanian model age and remobilization of the sulfides.
Geologic map unit (-156.646116645206, 68.2996926571836)
Mineral deposit model Remobilized, lead-zinc sandstone deposit?
Age of mineralization Probably Mississippian by analogy with other lead-zinc deposits in the western Brooks Range.
Alteration of deposit Widespread silicification and bleaching of the sandstone.

Production and reserves

Workings or exploration Only sampling and mapping by the U.S. Bureau of Mines is documented.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

MAS number 0020200003.

References