Canadian Natural Resources Limited ("Canadian Natural" or the “Company") is providing this third
update regarding the fire that occurred on January 6, 2011 at its Horizon Primary Upgrader.
Investigations by Occupational Health and Safety ("OH&S") and the Canadian Natural Investigation
team have been underway since the incident occurred. In addition, Canadian Natural has had a
Recovery team in place since January 7, 2011 which has begun planning the work to repair and
reinstate the equipment and derrick infrastructure damaged by the fire.
The following is an updated summary:
The fire occurred at approximately 3:30 pm on January 6, 2011 at the top of coke drum 1 B (1 of 4
coke drums used on the Horizon site numbered 1 A, 1 B, 2 A and 2 B), an area commonly referred to
as the cutting deck. The fire burned for approximately 3 hours and 45 minutes and was allowed to
burn itself out, which is the safest way to manage this type of fire.
Five workers were injured during the incident. Four of which were medically cleared on January 6,
2011. One worker remains in hospital in Edmonton and is in stable condition.
Air monitoring at the Horizon site and areas around the site, including Fort McKay, has b