Glencore’s sudden discovery that some of its cobalt is radioactive could not come at a better time. After a surge in prices in 2017, enthusiasm for cobalt has been fading, partly because of a surge in new supply. But sentiment could be changing after Glencore’s unit in the Democratic Republic of Congo (DRC) suspended cobalt sales after detecting low levels of radioactivity. “It’s nice to finally have some positive news in the market,” Gordon Buchanan, a senior trader at Stratton Metal Resources, said by phone from London. Glencore has a long history of curtailing supply to meet demand, and has long criticised rivals for producing too much and depressing prices. The Swiss commodity giant curtailed zinc output at mines in Australia, Peru and Kazakhstan in 2015 when prices languished at six-year lows. It also limited coal output when prices were low. Metal Bulletin prices for refined cobalt have fallen 5.6% in 2018, but there have been more pronounced declines in the raw material. As s...

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