Anna Mary Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi

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

Location: Cobb (1972, MF-413), loc. 42; NW1/4 sec. 29, T. 2 N., R. 3 E., of the Fairbanks Meridian. This prospect is located on the hill between Chatham and Tamarack Creeks, at an elevation of about 500 meters.
Geology: The discovery on the Mary claims was explored in 1931 and consisted of a N 70 W, 70 SW shear zone which averaged 4 to 8 feet wide. The hanging wall consists of 1 to 6 feet of crushed quartz while the footwall is 1 to 2 feet of blue clay-rich gouge (Hill, 1933). Iron oxide staining was present on some quartz, and arsenopyrite, and argentiferous galena had been identified on the prospect. A sample collected by Hill (1933) across 5 feet at the bottom of a 15 foot shaft averaged $0.46 of gold per ton (0.02 ounces of gold per ton). The Anna prospect was one hundred feet south and uphill from the Mary but had not been exposed to any degree in 1931. By 1931, the shaft on the Mary prospect had been sunk to a depth of 25 feet but had caved when visited by Stewart (1933) and Pilgrim (1932). Dump samples contained galena, arsenopyrite and stibnite with moderate gold. No production records are available from this shaft. The prospect was purchased by George Warmbold in 1938 and several pits and trenches were dug in late 1938 in an attempt to trace the shear zone.
Workings: By 1931 the shaft on the Mary prospect had been sunk to a depth of 25 feet but had caved when visited by Stewart in 1932 and Pilgrim in 1931.

Commodities (Major) - Au; (Minor) - Ag, Pb, Sb
Development Status: None
Deposit Model: Sulfide bearing, auriferous quartz, shear zone.

Other Databases

Link to USGS - Alaska:	LG130

Other Regions, Features and Areas containing this locality

References