The company said a transformer from a ball mill was being moved over to the SAG mill, which was scheduled to be back in production by Saturday.
However, Copper Mountain said production would be limited to about 1,000 tonnes per hour for about four weeks while repairs are made.
The cause of the failure was being evaluated, but details were not immediately available.
Copper Mountain owns a 75 per cent stake in the Copper Mountain mine in southern British Columbia.
Mitsubishi Materials Corp. who owns the remaining 25 per cent.