Unnamed (west of Tsusena Creek)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Ag; Cu; Sn
Other commodities Pb; W; Zn
Ore minerals cassiterite; chalcopyrite; galena; sphalerite; wolframite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-4
Latitude 63.013
Longitude -148.689
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 4,000 feet, near the drainage divide between Tsusena and Portage creeks. The map site is about 2.2 miles south of peak 5896, in the NW1/4 of in sec. 15, T. 22 S., R. 6 W., of the Fairbanks Meridian. The location is accurate to within 1,000 feet. This is locality D6 of Balen (1990: OFR 34-90).

Geologic setting

Geologic description

The country rocks in the area of this prospect are Upper Triassic calcareous shale, argillite, and siltstone cut by numerous dikes, sills, and plugs of altered diabase and gabbro. These rocks are overlain by Oligocene to Paleocene volcanic flows, and pyroclastic rocks, and intruded by diverse, Tertiary(?) hypabyssal plutons (Wilson and others, 1998). The deposit consists of tin- and silver-bearing quartz veins and a mineralized shear-zone. The ore minerals are cassiterite, chalcopyrite, galena, sphalerite, and wolframite. Samples of the deposit contained as much as 26.5 ounces of silver per ton, 0.55% tin, 1.2% lead, 5.4% zinc, and 0.66% copper (Balen, 1991).
Geologic map unit (-148.691260096169, 63.0125320334217)
Mineral deposit model Sn veins (Cox and Singer, 1986; 15b)
Mineral deposit model number 15b
Age of mineralization Early Tertiary(?).

Production and reserves

Workings or exploration The deposit was explored in 1980-81 by detailed geological mapping and geophysical exploration, but the claims later were allowed to lapse (Balen, 1991).
Indication of production None