NICKEL LATERITE

The MPSA area is chiefly underlain by ophiolitic rock suite consisting of highly folded, interlayered serpentinized harzburgite and dunite intruded by diabasic like swarms. The nickeliferous deposits in the area occur as residual product of extensive weathering of the serpentinite along the flat-lying to gentle sloping ridge which is the favourable site for the formation of this type of deposit. In the early stages of decomposition, the serpentinized peridotite is broken down by the groundwater entering along fractures and other planes of weakness. As decay continues, magnesia and silica begin to dissolve, porosity develops and more water is brought into contact with rock surfaces as decomposition progresses, the serpentine softens to an earthy material and passes through a colour of light green, to yellow-green, to yellow-brown, to brown lateritic soil mantle.

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