Katanga, which operates cobalt and copper mines in the DRC, said Aristotelis Mistakidis, Liam Gallagher and Tim Henderson had tendered their resignations.
Canadian heavy crude prices and TransCanada Corp shares slid on Friday, the day after the Keystone pipeline spilled 5,000 barrels of oil in South Dakota as officials in Nebraska mulled whether to approve another pipeline proposed by the company.
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.
Ontario Securities Commission says administrative penalty of up to C$1 million ($784,190) is due to Omega failure to comply with provincial securities law.
"Hedging by means of long-term (supplier) contracts is [] way to control such new issues (of securing materials supplies)," says VW head of sustainability.