Occurrence, Active

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Pb
Ore minerals chalcopyrite; galena
Gangue minerals calcite; muscovite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale B-6
Latitude 62.285
Longitude -152.7352
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is in a drainage located about 3.9 miles west-northwest of the fork of the Kichatna River with Moose Creek and about 4.2 miles north-northeast of Kohlsaat Peak in section 2, T. 12 N., R. 19 W., of the Seward Meridian. Accurate to within about 0.25 miles.

Geologic setting

Geologic description

The Kohlsaat occurrence is defined by quartz carbonate vein and vein breccia with steeply dipping 3-10 foot (1-3 meters) thick vein zone cutting monzodiorite (William Ellis, Alaska Earth Sciences, personal communication, 2014).
The local geology is composed of Jurassic to Early Cretaceous flysch sequence with local composite plutonic complexes intruding the host rock (Wilson and others, 2012).
Geologic map unit (, )
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Late Cretaceous.
Alteration of deposit Quartz carbonate.

Production and reserves

Workings or exploration Mapping and sampling program executed in 2013 by Alaska Earth Resource, Inc., and Millrock Resources, Inc.; no drilling has been performed. Over 100 samples were taken and assayed. One grab sample assayed at 4.25 ppm gold and 50 ppm silver (William Ellis, Alaska Earth Sciences, personal communication, 2014).
Indication of production None
Reserve estimates None.
Production notes None.