Frederich

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sb
Ore minerals arsenopyrite; gold; limonite; pyrite; stibnite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-2
Latitude 65.022
Longitude -147.65
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Frederich mine is located about 5 miles north of Fox along the Elliot Highway; NW1/4NE1/4 sec. 12, T. 2 N., R. 1 W., of the Fairbanks Meridian. Accuracy is within 2,000 feet.

Geologic setting

Geologic description

This site is a mineralized shatter zone in schist that is cut by granitic dikes. The lode consists of quartz and sulfides and their oxidation products. Kidneys of stibnite, some coarsely columnar and some finely granular, are more abundant near the footwall than the hanging wall (Brooks, 1916; B 649). Some of the ore is very rich in gold; production occurred from 1910 to 1912 (Brooks, 1911; Brooks, 1912). A shaft, a little more than 300 feet deep was sunk in a vein that dips from 70 degrees at the surface to 45 degrees at the bottom of the shaft, and is as much as 3.5 feet wide (Smith, 1913; B 525). Granitic rock was encountered 50 feet from the shaft in a crosscut into the hanging wall. A decomposed granite dike was encountered in a crosscut on a 300-foot level drift. Grab samples from probable mill ore taken in 1931 assayed 0.07 to 0.14 ounces of gold per ton (Hill, 1933).
Antimony ore was mined in 1916 (Smith, 1917; BMB 153). Some stibnite was produced during World Wars I and II (Mulligan, 1974, p. 11).
Geologic map unit (-147.652444095905, 65.0215708674932)
Mineral deposit model Gold-stibnite quartz vein.
Alteration of deposit Quartz, sericite, calcite, ankerite; the stibnite is partly oxidized on the 100-foot level and the granite weathers rusty yellow.

Production and reserves

Workings or exploration Two shafts sunk; drifts on 100-foot, 200-foot, and 300-foot levels (Smith, 1913; B 525).
Indication of production Yes; small
Production notes Gold mined from 1910 to 1912; antimony ore mined in 1916 and during WWII, but total production is unknown (Cobb, 1976; OFR 76-633, p. 69).

References

MRDS Number A015408

References

Smith, S.S., 1917, The mining industry in the territory of Alaska during the calendar year 1916: U.S. Bureau of Mines Bulletin 153, 89 p.
Reporters C.J. Freeman, J.R. Guidetti Schaefer (Avalon Development Corporation)
Last report date 5/4/1999