Specimen Gulch

Mines, Active

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-1
Latitude 64.5764
Longitude -165.38
Nearby scientific data Find additional scientific data near this location
Location and accuracy Specimen Gulch is a southwest-flowing seasonal tributary of Anvil Creek. It is below the high-level or bench deposits of the Summit claim (NM247). The map location is at an elevation of about 350 feet at about the midpoint of Specimen Gulch in the south-central part of section 36, T. 10 S., R. 34 W., Kateel River Meridian. The location is locality 48 of Cobb (1972 [MF 463]); it is accurate to within about 500 feet.

Geologic setting

Geologic description

Specimen Gulch heads in the high-bench gravels near the Summit claim (NM247); it also crosses a major east-side bench of Anvil Creek. Both the Summit and Anvil Creek bench placers contributed gold to the shallow deposits in Specimen Gulch (Collier and others, 1908, p. 191; Moffit, 1913, p. 84). In Specimen Gulch, gold occurred throughout an 8-foot section beneath a 1-foot muck layer. The gold was bright, coarse and not well waterworn (Collier and others, 1908, p. 191). In lower Specimen Gulch, bedrock is mainly graphitic schist, possibly between strands of the Anvil Creek fault (Hummel, 1962 [MF 247]). Upper Specimen Gulch is underlain by orthogneiss and metavolcanic schist (Bundtzen and others, 1994). The area has been mined repeatedly from 1899 until the present.
Geologic map unit (-165.382605537572, 64.5756351734121)
Mineral deposit model Alluvial placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Extensive surface workings. The area has been mined since 1899.
Indication of production Yes