30 blue herons found dead at Syncrude Mildred Lake site

The province is investigating after about30 blue herons werefound dead at an oilsands mine in northern Alberta.

Alberta's Energy Regulator (AER) saidit will investigate to determinewhat killed the birds at Syncrude's Mildred Lake facility, about 40 kilometres north of Fort McMurray, Alta.

Bob Curran, a spokesman for the agency, saida Syncrude worker found one heron Wednesday. The birdwas alive, but had to be euthanized. After the company searched the area, they found the rest of the birds dead in a run-off pond.

"It would contain mostly rainwater but there was some bitumen in there as well," Curran said.

Systems should keep wildlife out

The areathe birds were in isnot a tailings pond.Curran said AER is investigating whether the bitumen in the water was naturally occurringor was a result of the plant's operations.

He said the investigation would also look at the systems set up to keep wildlife away from the facility.

"One of the things we are doing is determining whether their deterrent systems were working properly."

Officials atSyncrudecould not immediately be reached for comment.

Five years ago, Syncrude was fined $3 million after 1,600 ducks died after landing on a tailings pond at a different facility in 2008.

Last November, 122 birds were killed after landing in three tailings ponds in the area, including one at Mildred Lake. Curran said in that case, the wildlife deterrents were working properly and severe weather forced the birds to land on the ponds.