Photograph : Mining Tour with Teachers - Las Vegas Sun News

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Miners set off a blast at the PABCO Gypsum mine near Lake Mead during an earth science workshop for teachers Wednesday, April 4, 2012. The workshops are sponsored by the Nevada Mining Association and the Nevada Division of Minerals.

Steve Marcus

Miners set off a blast at the PABCO Gypsum mine near Lake Mead during an earth science workshop for teachers Wednesday, April 4, 2012. The workshops are sponsored by the Nevada Mining Association and the Nevada Division of Minerals.

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