Bobbie Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi

Regional Level Types
Bobbie Prospect	Prospect
Fairbanks Mining District	Mining District
Fairbanks North Star Borough	Borough
Alaska	State
USA	Country

Location: 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.
Geology: 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).
Workings: 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).

Commodities (Major) - Ag, Au; (Minor) - Pb, Sb
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

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Link to USGS - Alaska:	LG129

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References