Geology and mining history of the Southeast Missouri ...
The Southeast Missouri Barite District and the Valles Mines are loed in Washington, Jefferson, and St. Francois Counties, Missouri, where barite and lead ore are present together in surficial and nearsurface deposits. Lead mining in the area began in the early 1700's and extended into the early 1900's. Hand mining of lead in the residuum resulted in widespread pits (also called shafts ...