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this site refers to ferruginous mantle and ferruginous lateric crust:
West of the ultrabasic plateau that forms the peninsula of Cap Bocage, the lower basin of the Ho River (catchment: 23 sq km) contains some opencast nickel mines, and pisolitic ironstone sands derived from the ferruginous lateritic crusts have been carried downstream and built by wave action into beach ridges bordering the river mouth in Baie Ugué.
The lower part of the catchment has been much affected by opencast mining, and by gullying and slumping of red ferruginous lateritic mantles on valley-side slopes. More than 60 years ago there were reports of rapid erosion as a sequel to mining in this area (Compton 1917).
This site shows a figure with the ferruginous crust and nickel underneath
FIG.4. Weathering Profile Characteristic of Hilltop Plateaux on Ultrabasic Massifs in New Caledonia. Shown are the typical locations of nickel ore (garnierite) at the weathering front, and zones of nickel, chromite, and cobalt accumulation beneath the red and yellow laterite horizons and the ferruginous crust. (After Paris 1981.)
Kate Hudson Netherlands Local time: 08:44 Native speaker of: English