Switch Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities As; Pb; W
Ore minerals arsenopyrite; galena; gold; ilmenite; limonite; magnetite; pyrite; scheelite
Gangue minerals garnet; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale CI
Quadrangle map, 1:63,360-scale B-2
Latitude 65.468
Longitude -144.892
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location is the approximate center of mining on Switch Creek. The placered area extends about 3,500 ft up and down stream from the intersection of the coordinates. Switch Creek is a tributary of Deadwood Creek.

Geologic setting

Geologic description

Headwaters of Switch Creek drain both Cretaceous biotite monzogranite and calcareous quartz-muscovite schist (Wiltse and others, 1995).
Both flood-plain and bench gravels have been mined. A bench on the west side of the creek in the lower valley is 12 to 15 meters above the creek bed. Remnants of other benches upvalley are sites of former mining operations (Mertie, 1938). The gravel on the benches is composed of cobbles and a few boulders. Boulders are fairly common in the present valley (Yeend, 1991). Gold has been concentrated within the lower 1 meter above of bedrock. The largest nugget found was 4 ounces (Mertie, 1938). Weighted mean of eight assays showed fineness of 760 Au and 231 Ag (Mertie, 1938). Johnson (1910), reported arsenopyrite in quartz-feldspar veins, and concentrates containing gold, arsenopyrite, pyrite, galena, cassiterite, ilmenite, garnet, tourmaline, limonite, and quartz. Gold has been mined sporadically on Switch Creek since 1906. Initially, opencut and drifting were the only mining methods used. Once hydraulic mining was introduced in 1922, it was the predominant mining method used on the creeks through the 1930s (Mertie, 1938). Both surface and underground work took place. Drift mining occurred on benches while hydraulic mining was used on creek gravels (Menzie and others, 1983, p. 52).
Geologic map unit (-144.894446735266, 65.4676352757651)
Mineral deposit model Placer gold deposit (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a

Production and reserves

Workings or exploration Gold has been mined sporadically on Switch Creek since 1906. Initially, opencut and drifting were the only mining methods used. Once hydraulic mining was introduced in 1922, it was the predominant mining method used on the creeks through the 1930s (Mertie, 1938). Both surface and underground work took place. Drift mining occurred on benches while hydraulic mining was used on creek gravels (Menzie and others, 1983, p. 52).
Indication of production Yes; small
Production notes Mining has been reported (see workings/exploration), however, amount of production is unknown.

Additional comments

See also Deadwood Creek, ARDF no. CI014.

References

MRDS Number A012237; D002684

References

Reporters C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)
Last report date 9/14/1998