Nickel deposits are typically found as concentrations in lateritic soils or in association with sulfide minerals in ultramafic magmatic rocks. Nickel occurs often with platinum group elements and has geochemi-cal affinities that make it occur with sulfide minerals such as pyrite, chalcopyrite, and pyrrhotite in ultamafic rocks such as komatiites.
Other nickel deposits are found in tropical regions, where lateritic weathering leaches away many elements, leaving just the residual material such as nickel that is not soluble. These deposits, called nickel laterite deposits, are found in parts of Africa including Madagascar and in the Caribbean. In most cases the host rock is ultramafic, but in some examples the tropical weathering is so intense that the nickel and associated metals are concentrated from other host rocks. Gold may also be concentrated in some lateritic weathering profiles.
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