Head of Global Sales and Marketing Markus Meurer said purchases in 2017 would rise to as much as 600,000 oz of palladium, compared to 160,764 oz last year.
Katanga, which operates cobalt and copper mines in the DRC, said Aristotelis Mistakidis, Liam Gallagher and Tim Henderson had tendered their resignations.
London hedge fund giant Lansdowne Partners lost a long-term bet against Glencore this year after the spectacular recovery of the miner took some by surprise.
"Hedging by means of long-term (supplier) contracts is [] way to control such new issues (of securing materials supplies)," says VW head of sustainability.