Six Gulch (Last Chance Gulch)

Mine, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-2
Latitude 62.96495
Longitude -156.51236
Nearby scientific data Find additional scientific data near this location
Location and accuracy Six Gulch, formerly known as Last Chance Gulch is a west and northwest flowing tributary of Ganes Creek (Maddren, 1910). The mine extends up Six Gulch for about 800 feet. The coordinates are at the mouth of gulch in the SE1/4 NE1/4, section 8, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate. Cobb (1972 [MF 363]; 1976 [OFR 76-576]) referred to the site as Last Chance Gulch and described it as locality 42.

Geologic setting

Geologic description

Six Gulch is a 2-mile-long tributary of Ganes Creek (ID011). It is locally incised into detrital sedimentary rocks of the Upper Cretaceous, Kuskokwim Group, which are intruded by Cretaceous or Tertiary, felsic to mafic dikes and sills (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994) Placer gold, locally accompanied by scheelite, was probably derived from mineralized dikes and sills. Stream gravels consist of locally derived sandstone, siltstone, and shale from the Kuskokwim group, and intrusive rocks (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005).
Gold was discovered on Ganes Creek in 1906 at the mouth of Six Gulch, then called Last Chance Creek (Maddren, 1910). The Six Gulch placer was mined for about 800 feet above its mouth. Early production was from open cuts; however, a dredge operated at the mouth of Six Gulch during the early 1930s (Mertie, 1936).
Geologic map unit (-156.514724362001, 62.9643172863416)
Mineral deposit model Placer Au deposit (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; probably mid-to-late Pleistocene (Bundtzen, 1980 [MIRL]).

Production and reserves

Workings or exploration Prospectors following up the occurrences flour gold on the Innoko River and lower Ganes Creek found an economic placer deposit at the mouth of Six Gulch in 1906. The deposit was worked on a small scale for about 20 years and was dredged in the 1930s.
Indication of production Yes; small
Reserve estimates There are possible gold resources in upper Six Gulch and at the sides of paystreaks that have been mined.
Production notes Six Gulch has produced gold for many years. The production is probably aggregated with Ganes Creek (ID011).

References

References

Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/12/2003