Sledge Creek

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Sn; W
Ore minerals cassiterite; gold; scheelite

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-2
Latitude 64.637
Longitude -165.5042
Nearby scientific data Find additional scientific data near this location
Location and accuracy Sledge Creek is a west tributary to Snake River. A placer gold deposit has been mined at the surface near the point where the creek enters the Snake River valley and was drift mined at unknown locations. The location is the site of surface mining. It is accurate within about 1,000 feet. Cobb (1978 [OFR 78-93]) summarized information about this locality under the name 'Sledge Cr.'.

Geologic setting

Geologic description

Sledge Creek has been mined at the surface in a shallow deposit near where the creek emerges from the hills and enters the Snake River valley. Drift mining at two unknown locations was also reported by Mertie (1918 [B 662-I, p. 454]). Patented claim U.S. Mineral Survey No. 1343 is in lower Sledge Creek, immediately above the surface placer cut, and claim U.S. Mineral Survey No. 1840 is in the south fork of Sledge Creek. Gold and tungsten were reported at the former site (Heiner and Porter, 1972, Kardex site Kx 52-259). Tungsten in scheelite was also reported by Thorne and others (1948, p. 33) in Sledge Creek. Kennecott Exploration Company found gold in two pan concentrate samples collected 1,500 and 3,000 feet below the south fork junction. The samples, contained more than 4 and more than 2 ppm gold respectively. They also contained anomalous amounts of tin, suggesting that cassiterite is present. This placer deposit is at an elevation of 150 to 175 fee, suggesting that it may have been influenced by Quaternary sea-level changes during its development.
Bedrock of the Sledge Creek drainage is mostly chloritic and calcareous schist. One or more branches of the Rodine fault parallel upper Sledge Creek (Bundtzen and others, 1994). At least some of the placer gold in Sledge Creek was probably derived from erosion of the Alpha Ridge deposit (NM171).
Geologic map unit (-165.50680652864, 64.6362323536133)
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 Drift mining reported in 1916; small open-cut surface mining on and below U.S. Mineral Survey No. 1343 probably took place in about 1925 (Heiner and Porter, 1972).
Indication of production Yes; small
Reserve estimates Sledge Creek could contain a largely unmined placer deposit (C.C. Hawley, personal observation, 1994, 2000).