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While Husky Energy Inc. says cleanup is underway at a pipeline spill in Kananaskis Country, the incident is but the latest in a series of leaks and ruptures the Calgary company has reported in recent years.

A Husky operator discovered crude oil beside a pipeline route at Cox Hill Creek on Thursday afternoon. The volume of oil that spilled is unknown, but the energy regulator said the crude has affected the creek.

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Husky said its crews are using vacuum trucks to clean up the site, located 22 kilometres west of the popular hiking and camping community of Bragg Creek. Husky spokesman Mel Duvall said the spill is in a heavily treed area and difficult terrain is hindering the speed of the cleanup.

Duvall said the company’s leak detection system was operational but the spill went unnoticed until it was found by a worker. He said the investigation will uncover why its mechanical system did not flag the failure.

The company said despite having two high-profile spills in less than a year — following a massive spill on the North Saskatchewan River last summer — its rate of pipeline incidents has been steadily declining.

“We take every incident seriously and will use what we learn from this incident to further improve our operations,” Duvall said in a statement.