Oklahoma+Lead+Contamination

=The Oklahoma Lead Contamination=

The Oklahoma Lead Contamination was first discovered on April 24, 2006.

In 1913, as the Tri-State district expanded, lead and zinc ore was discovered on Harry Crawfish's claim and mining began. The Picher area became the most productive lead-zinc mining field in the Tri-State district producing over $20 billion worth of ore between 1917 and 1947. More than 50% of the lead and zinc metal used during World War I were produced by the Picher district. At its peak over 14,000 miners worked the mines and another 4,000 worked in mining services.

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