Firefighters battled wildfires in northern Alberta, Canada’s biggest crude-producing region , for a sixth day on Thursday, with two blazes near oil sands facilities still out of control. The wildfires have forced producers in the Western Canadian province, the largest source of U.S. crude imports, to shut in 233,000 barrels per day of crude production, around 10 percent of total oil sands output. The biggest fire, on the Canadian military’s Cold Lake Air Weapons Range, had grown in size to 20,000 hectares (49,000 acres) from 17,000 hectares on Wednesday. That blaze has forced Cenovus Energy Inc and Canadian Natural Resources Ltd to shut down production and evacuate staff from their Foster Creek and Primrose oil sands projects. Janelle Lane, a wildfire information officer at the Alberta government, said the fire had advanced to roughly 15 kilometres (9.3 miles) away from Cenovus’s Foster Creek […]