Peru’s Antamina said its copper production will rise by 40% after a $1.2bn expansion is completed.

Antamina president Ian Kilgou said the company’s copper output will grow 30-40% annually following the expansion.

The construction work will be completed in the second half of 2011 and the expansion will extend the life of the mine to at least 2029, Antamina said.

Antamina, a joint-venture between BHP Billiton, Xstrata, Teck Cominco and Mitsubishi Corp, produced 343,179t of copper and 495,420t of zinc in 2009.