Unnamed (near hill 1265)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Sn
Other commodities As; Cd; Hg; Zn
Ore minerals hematite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-1
Latitude 62.39221
Longitude -156.16988
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is near hill 1265 on an northwest-trending ridge about 2 miles west of the Kuskokwim River. The occurrence is about 0.5 mile northeast of the center of section 32, T. 27 N., R. 37 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a zone of thin quartz veinlets with small tourmaline grains in a distinctively reddish colored, hematite-bearing sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). The sandstone strikes N42W and dips 50SW. The individual quartz veinlets are about one-eighth of an inch thick but there is no information on the overall size of the zone of quartz veinlets. A grab sample contained 150 parts per million (ppm) tin, 500 parts per billion (ppb) silver, 900 ppm zinc, 20 ppm arsenic, 960 ppb mercury, 1.9 ppm cadmium, and 2,000 ppm boron (McGimsey and others, 1988).
Geologic map unit (-156.172240126867, 62.3915572996733)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Development of hematite and tourmaline.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Indication of production None

References