Anna Mary

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Pb; Sb
Ore minerals arsenopyrite; galena; gold; limonite; stibnite

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.06
Longitude -147.397
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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.
Geologic map unit (-147.399447430639, 65.0595772438911)
Mineral deposit model Sulfide bearing, auriferous quartz, shear zone.

Production and reserves

Workings or exploration 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.
Indication of production None


MRDS Number A015438


Freeman, C.J., 1992, 1991 Golden Summit project final report, volume 2: Historical summary of lode mines and prospects in the Golden Summit project area, Alaska: Avalon Development Corp., 159 p. (Report held by Freegold Recovery Inc. USA, Vancouver, British Columbia.)
Pilgrim, E. R., 1932, Progress of Lode mining in Interior Alaska - 1931: Alaska Territorial Department of Mines Internal Report 9 p.
Pilgrim, E.R., 1933, Progress of lode mining in interior Alaska, 1932: Alaska Territorial Department of Mines Miscellaneous Report 194-4, 11 p.
Reporters C.J. Freeman, J.R. Guidetti Schaefer (Avalon Development Corporation)
Last report date 5/4/1999