McCarty Shaft

Mine, Active

Commodities and mineralogy

Main commodities Au
Ore minerals arsenopyrite; gold; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.0627
Longitude -147.3626
Nearby scientific data Find additional scientific data near this location
Location and accuracy The McCarty Mine was mined from a shaft on the McCarty vein. It is the westernmost shaft in a group of six claims of the McCarty and American Eagle Mine group (LG152) that lie at the head of Fairbanks Creek, just east of the Wolf Creek divide. The shaft is about 0.5 mile west-southwest of the McCarty Mine labeled on the U.S. Geological Survey Livengood A-1 SW, topographic map. It is in the NW1/2 section 28, T. 3 N., R. 2 E., of the Fairbanks Meridian.

Geologic setting

Geologic description

Note: As of 2008, this site and several others in the vicinity are being explored as a single entity by Freegold Ventures Inc. (Freeman, 2008) Considerable new mineralization has been discovered that indicates this is part of a larger mineralized system that is described as a separate ARDF site (LG206).
The vein exposed at the McCarty shaft varies from a few inches to five feet wide; it strikes N70W and dips 65SW. It has been traced for 1,200 feet and samples from the surface pits along the whole distance carry gold. There has been considerable shearing along the vein walls and several small faults have been noted. The vein filling is a milky quartz that often contains arsenopyrite (W.J. McCarty, unpublished report, 1932).
By 1930, the McCarty shaft was sunk 60 feet on the south-dipping McCarty shear zone (Stewart, 1931). A drift from the 60-foot level of the shaft extended 135 feet east and 369 feet west. Two raises had been driven to the surface from the 60-foot level, one at the 135-foot station in the east drift and one at the 284-foot station of the west drift. The shaft was being deepened in 1930. Work continued in 1932 to deepen the shaft from 80 to 150 feet and drive production drifts at that level (Pilgrim, 1933). Stopes above the 60-foot level produced a little more than 1,000 tons of ore by 1930. This ore was processed at the nearby McCarty mill northeast of the McCarty shaft. There was at least some production through the 1930s but the details are unknown.
Geologic map unit (-147.365047653955, 65.0622778521028)
Mineral deposit model Gold-quartz vein.
Age of mineralization Probably about 90 Ma based on analogy with similar gold deposits nearby.

Production and reserves

Workings or exploration By 1930, the McCarty shaft was sunk 60 feet on the south-dipping McCarty shear zone (Stewart, 1931). A drift from the 60-foot level of the shaft extended 135 feet east and 369 feet west. Two raises had been driven to the surface from the 60-foot level, one at the 135-foot station in the east drift and one at the 284-foot station of the west drift. The shaft was being deepened in 1930. Work continued in 1932 to deepen the shaft from 80 to 150 feet and drive production drifts at that level (Pilgrim, 1933).
Indication of production Yes; small
Production notes Stopes above the 60-foot level produced a little more than 1,000 tons of ore by 1930. This ore was processed at the nearby McCarty mill northeast of the McCarty shaft. There was at least some production through the 1930s but the details are unknown.

References

MRDS Number 10307739

References

Freeman, C.J., 2008, Executive summary report for the Golden Summit project, Fairbanks Mining District, Alaska: Unpublished Technical Report for Freegold Ventures Ltd., 112 p. (posted on www.sedar.com, March 31, 2008).
Pilgrim, E.R., 1933, Progress of lode mining in interior Alaska, 1932: Alaska Territorial Department of Mines Miscellaneous Report 194-4, 11 p.
Stewart, B.D., 1931, Report on cooperation between Territory of Alaska and the United States in making mining investigations: Alaska Territorial Department of Mines, Annual Report 1931.
Reporters C.J. Freeman, J.R. Guidetti Schaefer (Avalon Development Corporation); D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008