Hydro plans to halt production and lay off 4,700 people at Alunorte, which has been operating at half capacity since March due to an environmental dispute.
Quarterly deal volume was up 91% to $75.7 billion from $39.6 billion in the same period last year, bucking a global trend of declines in Europe and Asia.
Experts say that, when done correctly, artisanal mining can be an ethical source of low-cost, high-grade cobalt and a key mechanism in keeping the market balanced during times of supply shortage.