Glencore trims copper guidance after mixed first half

Glencore reported a 15% fall in own-sourced copper production in its first half on Friday, to 510,200 tonnes, as it trimmed its copper production guidance for the rest of the year.

The FTSE 100 mining giant put the decline down to ongoing geotechnical constraints at Katanga, the basis change arising from the sale of Ernest Henry in January, mine sequencing at Collahuasi, and lower copper units…