Liberty

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals arsenopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale B-6
Latitude 63.263
Longitude -149.538
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Liberty prospect is at an elevation of about 2,700 feet on the broad flat ridge between Costello Creek and Colorado Creek. It is in sec. 18, T. 19 S., R. 10 W., of the Fairbanks Meridian. Access to the prospect is from the road to the Dunkle Coal mine. The prospect is approximately 200 feet east of the road and approximately 500 feet south of the airstrip. The location is accurate to within 500 feet. This is locality 3 of Cobb (1978: OFR 78-1062).

Geologic setting

Geologic description

Thick Quaternary glacial deposits and Upper Tertiary sedimentary cover the older rocks in this area, which consist of Upper Jurassic to Upper Triassic(?) crystal tuff, argillite, chert, graywacke, and limestone. The older rocks are intruded by Late Cretaceous quartz diorite dikes, mainly along the nearby Chulitna fault (Wilson and others, 1998). The Liberty deposit consists of arsenopyrite-bearing quartz veins, reportedly in silicified limestone. Samples from trenches and pits contain 0.06-0.14 ounce of gold per ton and 1.2-8.6 ounces of silver per ton (Ross, 1933). Hawley and others (1978) report values of 0.005 to 0.06 ounce of gold per ton and traces of silver in samples from the same trenches sampled by Ross (1933).
Geologic map unit (-149.540289875343, 63.2625285734715)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1987; model 36a)
Mineral deposit model number 36a
Age of mineralization Probably Late Cretaceous (70-65 Ma) or younger, assuming deposit is related to the diorite dikes.

Production and reserves

Workings or exploration Surface trenching and pitting. Samples from trenches and pits contain 0.06-0.14 ounce of gold per ton and 1.2-8.6 ounces of silver per ton (Ross, 1933). Hawley and others (1978) report values of 0.005 to 0.06 ounce of gold per ton and traces of silver in samples from the same trenches sampled by Ross (1933).
Indication of production None

References

MRDS Number A011316

References

Salisbury and Dietz, Inc., 1984, 1983 mineral resource studies--Kantishna Hills and Dunkle Mine areas, Denali National Park and Preserve, Alaska: U.S. Bureau of Mines, Contract No. S0134031, 1,080 p.
Reporters N. Van Wyck (Stevens Exploration Management Corporation); F.H. Wilson (USGS)
Last report date 3/28/2016