Move will push up costs by Cdn$250 million ($187M).
Nexen Mining News
Second worker is in critical condition.
The remaining 55 pipelines affected by a suspension order must stay closed until the company can demonstrate they're safe.
The largest synthetic crude oil processing facility in Canada is slowly recovering from a fire that damaged equipment and communication lines over the weekend.
Questions multiply on future of Canadian projects.
A day after reporting a significant jump in the number of pipeline failures, the Alberta Energy Regulator is now investigating one of the biggest ruptures in the province in years.
Natural Resources Minister Joe Oliver says oil sands investment not declining on foreign deal limits.