A Tennessee gravel and sand mining operator has been ignoring a cease-and-desist letter for months, andopponents say its continued construction on the banks of North America's most biodiverse river may already beharming wildlife.The Duck River in middle Tennessee has the most species of any river on the continent, Tennessee WildlifeResources Agency Assistant Chief of Biodiversity Pandy Upchurch said, with at least 151 species of fish and 55species of mussels including eight federally endangered species.
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