Haul truck driver was entering the shovel pit when he noticed no power on the shovel & smoke coming out of the back of house. The fire suppression system activated & a mayday was called at 11:26. The electrician killed the power-fire brigade was dispatched. The fire was out at 11:54 & a fire watch was put in place. At approx 12:10 it started to burn again & was called out at 12:26.