Frack Sand Mining Boom Silica Dust

Nov 14 2014 Add sand mining to the list of industries transformed by the U.S. oil boom. The tiny grains of silica are what keep frackers fracking propping open cracks punched into rock so oil and natural gas can flow. As drilling surged so has demand for sand. Sand production has more than doubled in the U.S. over the past seven years.

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