Sentences with phrase «gypsum stacks»
Thus, according to US News & World Report, the EPA is currently «weighing whether to classify the gypsum stacks as hazardous waste under federal statutes, which would force the industry to provide strict safeguards» (to nearly 1 billion tons of waste).
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Miners pull phosphate ore out of the ground, crush it, and throw it into an acid lake, where it separates into white gypsum stacks and a liquid acid that is then processed further to feed crops.
On June 27, 1994, a gaping sinkhole developed in a 400 - acre, 220 - foot - high gypsum stack containing a liquid impoundment of acid and ammonium.