NEW YORK Operations
resumed at Copper Mountain Mining Corp.s semi-autogenous
grinding (SAG) mill in British Columbia late May 17 after an
earlier transformer failure temporarily idled the operation (
amm.com, May 17).
The Vancouver, British
Columbia-based company said it was able to bring the SAG mill
and one ball mill at the site back online one day ahead of
schedule by replacing the damaged transformer with an identical
transformer from the facilitys other ball mill.
Production from the restarted
mill over the weekend was better than forecast, the company
said, noting that the SAG mill and single ball mill operated at
an average rate of 25,400 tonnes per day compared with an
average run rate of 29,000 tonnes per day in the first quarter
"We are extremely pleased with
our mine site teams ability to work quickly and
effectively to get the SAG mill operational one full day ahead
of our original estimate and at an increased throughput rate,"
Copper Mountain president and chief executive officer Jim
ORourke said in a statement.
Copper Mountain said the exact
cause of the failure is being investigated by supplier ABB as
well as a third-party consultant. The damaged transformer was
trucked to ABBs transformer facility in Edmonton,
Alberta, for repair, which the company expects to take two and
a half weeks. ABB also will manufacture a full set of
replacement coils costing C$125,000 ($121,000) for any future
A company spokeswoman did not respond to a request for