The Alberta Energy Regulator has wrapped up an investigation of nearly three dozen coal mine water structures across the province and has found them all to be without significant deficiencies except for one.

“One structure, owned by Coal Valley Resources, was found to be significantly deficient,” AER Executive Vice President of Operations Kirk Bailey said.

“Inspectors found erosion within the structure, which was causing a free flow of water from a partially reclaimed pit, which is a contravention of several Environmental Protection and Enhancement Act approval conditions.” The mine pond, which is located near Edson, is now under investigation. Bailey said the AER will release the probe’s results when complete.