Six Gulch Mine (Last Chance Gulch), Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Six Gulch Mine (Last Chance Gulch)	Mine
Innoko Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: 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.
Geology: 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).
Workings: 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.
Age: Quaternary; probably mid-to-late Pleistocene (Bundtzen, 1980 [MIRL]).
Production: Six Gulch has produced gold for many years. The production is probably aggregated with Ganes Creek (ID011).
Reserves: There are possible gold resources in upper Six Gulch and at the sides of paystreaks that have been mined.

Commodities (Major) - Au; (Minor) - Ag, W
Development Status: Yes: small
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).

Other Databases

Link to USGS - Alaska:	ID025

Other Regions, Features and Areas containing this locality

References