PARIS (Reuters) – French mining company Eramet said on Tuesday that New Caledonia had authorised its SLN subsidiary to export an additional 2 million tonnes of nickel ore per year, as part of steps to revive the struggling nickel producer. The extra volume, which will allow SLN to export up to 6 million tonnes of nickel ore annually, has been a key demand of Eramet as it attempts to turn around the business that has faced recurring losses due to high costs. The increase in exports to 6 million tonnes is expected to be achieved by 2024, Eramet said in a statement. SLN is still ramping up export…