Blackfoot Bridge Mine, Idaho

The Blackfoot Bridge Mine is a recently opened mine in the Permian-age sea bed deposit known as the Phosphoria Formation, in southeastern Idaho. While not as large as the phosphate operations in Florida, more than thirty mines have been worked here over the last century, and today there are a half dozen or so active mines. Blackfoot Bridge was opened by Monsanto, which has mined the area for many years in order to supply its phosphate plant in Soda Springs.