New Caledonia's Koniambo nickel plant says jobs have to be cut in the face of the slump of commodity prices.
The company, KNS, announced last week that 140 positions would be dis-established - 50 of them affecting New Caledonians.
Its chief executive has been in talks with unions, telling them that there was no other option to survive given the competition from Indonesia.
Marc Boissonneault told a media conference that he hoped the Glencore investors, who are key stakeholders, could help return the plant to profitability by 2018.
The job cuts are expected to be carried out within the next month.
Paris considers the Koniambo plant to be a pillar of its policy to rebalance the territory's economy by developing the poorer mainly Kanak northern province.