UK investigators raided home of former investment banker to look for evidence connected with a bribery investigation into mining giant Rio Tinto Group.
Partial updgrading would free up pipeline space and produce a grade of oil that's easier to refine and more valuable than the heavy grades produced currently.
Samsung C&T has approached Somika SPRL to buy cobalt produced at its Kisanfu mine in Congo after only buying copper from the company for the past four years.
