It may not have affected production too heavily but a fire at the Co-op Refinery Complex on May 15 is still proving costly.

The fire department has determined that the blaze began in a pump used to move crude oil. The pump suffered a mechanical failure, which caused it to overheat. That set the crude oil on fire.

The blaze was small, but it created heavy, thick black smoke that was noticed throughout the city.

While the fire was quickly put under control, the damage is still estimated at around $5 million.

Fire and Protective Services indicates that a final report has still not been completed in a previous fire and explosion at the refinery last October.

Edited by CJME's Sabeen Ahmad and Karen Brownlee.