Last Chance Creek (west bench)

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals gold; hematite; magnetite; pyrite; scheelite

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-1
Latitude 64.7214
Longitude -165.4594
Nearby scientific data Find additional scientific data near this location
Location and accuracy This is a small bench placer mine located on the west side of Last Chance Creek, about 2,000 feet southwest of its confluence with North Fork Snake River. It is included in locality 89 of Cobb (1972 [MF 463], 1978 [OFR 78-93]). The map location is in the SW1/4 section 10, T. 9 S., R. 34 W., Kateel River Meridian. Mining claims were patented under U.S. Mineral Survey No. 1838.

Geologic setting

Geologic description

A bench placer was mined about 500 to 600 feet west of Last Chance Creek, immediately above its confluence with North Fork. The pit is oriented northeast, parallel to the modern drainage. The placer was mined hydraulically to bedrock for a distance of about 1,000 feet on the California Association and Good Chance Association claims (U.S. Mineral Survey No. 1838). Moffit (1913, p. 87) reported scheelite, pyrite, magnetite, and hematite from Last Chance Creek near Dewey Creek, a name not currently used. A quartz-ankerite vein cutting schistose bedrock is exposed at a bedrock drain of the cut. A sample of this vein did not contain gold, but it is similar to others in the area that are locally auriferous. Bedrock in the area is probably part of the 'mixed unit' of Till and others, 1986) and the calcareous metaturbidite schist of Bundtzen and others (1994).
Geologic map unit (-165.462016964561, 64.7206362431258)
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 This small bench placer was mined hydraulically, probably before 1926. Claims were located between 1906 and 1916; the claims were surveyed for patent in 1926, and most of the workings predate that year.
Indication of production Yes; small