Question: Which Central Appalachian coal producer was responsible for a spill that dumped 306 million gallons of slurry into tributaries of the Tug Fork River? 
Sentence (from "Martin County coal slurry spill"): By morning, Wolf Creek was oozing with the black waste; on Coldwater Fork, a 10 ft wide stream became a 100 yd expanse of thick slurry.
Relevant evidence: No