Two major Canadian oil sands operators said Monday they have resumed output at sites that had been shut down by a more than two-week old wildfire in northern Alberta, which exports much of its crude oil production to the U.S. The blaze had shut-in nearly 10% of Canada’s oil sands output, or about 233,000 barrels a day, since it was first detected on May 22. Canadian Natural Resources Ltd. CNQ -2.32 % said it expects to resume full production later this week at its 80,000 barrel-per-day Primrose site, which had been evacuated and shut down, and its 30,000 barrel-a-day Kirby South operation, which was forced to cut output due to the temporary closure of a pipeline. Cenovus Energy Inc. CVE -3.28 % said it began ramping up production at its 135,000 barrel-per-day Foster Creek site over the weekend, but didn’t provide an estimate for when output levels would return […]