Ore bodies are elongate, overlapping lenses, bands, and irregular masses in shear zones cutting serpentinized dunite, peridotite, and pyroxenite forming parts of a highly differentiated ultramafic intrusive. The ores are believed to have been deposited by residual chromite-rich hydrothermal solutions formed by differentiation of an original homogeneous ultramafic magma. Following chromite deposition, further differentiation of these solutions produced a siliceous residue that filled fractures and hydrothermally altered the wall rocks. This interpretation is supported by field and petrographic relationships and by chemical and trace element studies of cross-sections of the ore bodies.

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