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Mining in Missouri’s Old Lead Belt left material that can be carried downstream with river sediment. This study examines suspended sediment and associated trace elements in the Big River during 2018–21.
The authors describe sample collection, laboratory analysis and quality controls, then compare sediment concentrations, transport and chemical composition under different stream conditions. Maps, measurements and tables connect the findings to the river and its mining history. The complete original report, prepared with the U.S. Environmental Protection Agency, retains its data explanations, supporting references and federal cover photograph.