Mother Lode

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sb
Ore minerals gold; stibnite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.05
Longitude -147.463
Nearby scientific data Find additional scientific data near this location
Location and accuracy Cobb (1972, MF-413), loc. 37; NW1/4 sec. 36, T. 3 N., R. 1 E., of the Fairbanks Meridian. This prospect is on the ridge at the head of Willow Creek, about a mile WNW of Cleary Summit. Accuracy is within 2,500 feet.

Geologic setting

Geologic description

The prospect consists of a sericitized granite porphyry dike which cuts a stibnite-bearing schist. The stibnite occurs as pods and veinlets in the schist and as a surface coating on the dike contact (Prindle, 1910). Specimens of ore from this deposit are made up of a granular aggregate of stibnite (Brooks, 1916, p. 33; B 649). The aggregates are highly weathered, and a little pyrite occurs with the stibnite. There are also some vitreous quartz grains buried in the stibnite; some of these grains showed crystal terminations (Brooks, 1916, p. 33; B 649).
The stibnite contains less that $1 per ton in gold (0.05 ounces of gold per ton) but the grade of the granite porphyry is unknown. The prospect was idle in 1916 and was noted to be associated with a horizontal structure which may have been parallel to foliation (Brooks, 1916; B 649). The Mother Lode prospect was examined as a possible source of antimony in 1942 but no additional exploration was conducted due to insufficient tonnage potential (Killeen and Mertie, 1951).
Geologic map unit (-147.465446089859, 65.0495762975531)
Mineral deposit model Stibnite vein (Cox and Singer; model 27d).
Mineral deposit model number 27d
Alteration of deposit Stibnite aggregates are highly oxidized and sericite alteration was observed in the granite porphyry dike.

Production and reserves

Indication of production None

References