Manganese ores are found associated with basaltic outcrops on the west coast
of New Caledonia. Deposits located near Bourail, Poya, and Ouaco were quarried
between 1918 and 1922 and again between 1949 and 1953, producing a total of
about 60,000 tonnes of ore with an average content of 49 per cent manganese. The
ores were exported, mainly to the United States. The landscape impacts of this
mining have been negligible in comparison with those resulting from the
extraction of nickel and iron ores.