Bobbie

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Pb; Sb
Ore minerals argentiferous galena; pyrite; stibnite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.061
Longitude -147.417
Nearby scientific data Find additional scientific data near this location
Location and accuracy Cobb (1972, MF-413), loc. 41; SW1/4NE1/4 sec. 30, T. 3 N., R. 2 E., of the Fairbanks Meridian. This prospect is west of the junction of Tamarack and Chatham Creeks, at an elevation of 1,650 feet. Accuracy is within 1,500 feet.

Geologic setting

Geologic description

A 60-foot adit was driven on a northwest striking, southwest dipping shear zone which varied from 12 to 14 inches thick and contained abundant galena. The ore contained $79.58 per ton in gold and silver (equivalent to about 3.8 ounces of gold per ton) and significant values in lead (Times Publishing Company, 1912). Smith (1913, B 525) reported that the Bobbie shear zone trends nearly north-south with a west dip and consists of banded galena with stibnite as the main components. Galena crystals near the wall rock grade into the center of the sulfide vein where coarse euhedral galena occurs. Brooks (1916, B 649) noted that stibnite occurred as kidney-shaped masses with euhedral quartz crystals; minor pyrite was embedded in the stibnite. The Bobbie 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 (-147.419447480082, 65.0605770108465)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c

Production and reserves

Workings or exploration A 60-foot adit was been driven on a northwest striking, southwest dipping shear zone. The ore contained $79.58 per ton in gold and silver (equivalent to about 3.8 ounces of gold per ton) and significant values in lead (Times Publishing Company, 1912).
Indication of production None

References

MRDS Number A015435

References

Reporters C.J. Freeman, J.R. Guidetti Schaefer (Avalon Development Corporation)
Last report date 5/4/1999