Location: Centralia, Washington Owner: Transalta Improving the Process Following the closure of the Transalta Centralia coal mine, the company decided to move the refuse tailings to an old mined-out pit as part of the site remediation. The old refuse ponds are dredged, reprocessed to recover the fine coal, and then dewatered and deposited sub-aqueously into the mined-out pit. The pit receives the area drainage and essentially functions

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