Las Vegas Sun - Photograph : Mining Tour with Teachers

January 21, 2018

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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.