Three companies face 53 charges in the deaths of two foreign workers at an oilsands project two years ago.

The charges are laid under the province's Occupational Health and Safety Act and involve Canadian Natural Resources Ltd., Sinopec Shanghai Engineering Company Ltd. and SSEC Canada Ltd.

The incident happened in April 2007 on an oilsands project near Fort McKay, about 70 kilometres north of Fort McMurray, when two temporary workers from China were killed when the roof of an oil container collapsed on top of them.

The companies are to appear in court on June 8th and the maximum penalty for a first offence under act is $500,000 for each charge.

With files from the Canadian Press