Brumfield

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale FB
Quadrangle map, 1:63,360-scale D-1
Latitude 64.97
Longitude -147.43
Nearby scientific data Find additional scientific data near this location
Location and accuracy The claims that constitute the Brumfield mine lie in the valley of Hill Creek, a tributary of Gilmore Creek, in sec. 30, T. 2 N., R. 2 E., Fairbanks Meridian (Saunders, 1963). It is directly south of the Hill Creek mine (FB109).

Geologic setting

Geologic description

Hill (1933) shows a granite porphyry extending along the ridge south of Gilmore Creek from the head of Engineer Creek to the head of Pearl Creek, a distance of about 7 miles. All of the bedrock exposed by placer mining is part of this intrusion (Saunders, 1963). Gold is found throughout the granitic bedrock and also occurs in narrow quartz veinlets that carry visible free gold (Saunders, 1963). Saunders (1963) reported that placer mining was done using a small crawler-type tractor for stripping moss and one or two feet of overburden. The remaining two to four feet of gravel was shoveled by hand into a 6-inch sluice box. The descriptions are somewhat unclear, but this may be a residual placer on a decomposed, quartz-veined granite.
Geologic map unit (-147.432437162026, 64.969575683114)
Mineral deposit model Residual placer on a decomposed, quartz-veined granite porphyry?

Production and reserves

Workings or exploration Saunders (1963) reported that placer mining was done using a small crawler-type tractor for stripping moss and one or two feet of overburden. The remaining two to four feet of gravel was shoveled by hand into a 6-inch sluice box.
Indication of production Yes; small
Production notes The production data are not available.

References