Kazakhmys net profits slide

■ Copper mining group Kazakhmys yesterday posted a 10 per cent jump in full year revenues in 2011 to $3.5bn (£2.2bn). The group's pre-tax profit rose to $1.62bn. But net profit slumped by 36 per cent from last year to $930m, as the group recorded $444m impairment charge linked to the sale of its petroleum business and booked $472m in losses from discontinued operations. Revenues from the sale of copper cathode and rods were $2.57bn, marginally higher than 2011, as the stronger copper prices compensated for lower sales volumes.