The Talvivaara mine in Finland uses a novel bio based method to get nickel out of the ore but it has not been super successful so far. But it is in operation, a

The Talvivaara mine in Finland uses a novel bio based method to get nickel out of the ore but it has not been super successful so far. But it is in operation, after quite major problems. AFAIU the concentration is so low that traditional methods would not have been profitable.