See also: Bonneville County Idaho Gold Production
Mount Pisgah District
Commodity: gold
This little-known district, about 40 miles from Soda Springs on the Union Pacific Railroad, was discovered in the seventies and at first is reported to have yielded $250,000 annually from placers. There has been some lode mining and recently some dredging, but the dredge has been idle for several years. Since 1932, an increase in production from small placer operations has been reported.
Mesozoic sedimentary rocks are cut by intrusive rocks, apparently largely dioritic and in the form of dikes and sills. The principal lodes are large tabular masses of quartz (whether veins or quartzite beds is not clear), which have been shattered and had calcite and auriferous pyrite deposited in them. In the material so far mined, the pyrite is oxidized and the gold is free.
Pine Creek Coal District
Commodity: coal
Several prospects have been opened in Cretaceous sedimentary rocks here, but they show mainly lenses of carbonaceous shale intercalated in sandstone with some impure and mashed coal.
Willow Creek-Caribou Coal District
Commodity: coal
A number of prospects have been opened in Cretaceous beds here, but they show mainly lenses of carbonaceous shale in sandstone. Coaly material that can be burned has been sorted from some of the lenses.
