Canadian Natural Resources Limited is facing charges for alleged environmental infractions north of Fort McMurray.
The province says, in May 2010, hydrogen sulphide gas, produced during the bitumen upgrading process, was released into the environment at the Horizon Oil Sands facility, 70 kilometres outside city limits.
The operator is facing three charges, for infractions including, releasing a substance with adverse environmental effects and failing to report the infraction once it was discovered.
Hydrogen Sulphide gas is a colorless, very poisonous, highly explosive flammable gas with the characteristic foul odor of rotten eggs.
CNRL is slated to appear in court, July 11th.