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Strong commitment to ongoing cleanup of lead in Tri-State Mining District Spanning nearly 2,500 square miles across Missouri, Kansas and Oklahoma, the Tri-State Mining District was one of the world's leading zinc and lead mining areas, producing over 400 million tons of crude ore between about 1850 and 1970. Over the past four decades, EPA has cleaned up millions of cubic yards of mining ...

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  • Environment and natural world 67.53%
  • Business, economics, society 32.47%
    • Society and people 100.00%

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