 The internal structure of the ultamafic includes some interesting features, notably a so-called "chill-zone" of assumed orthocumulate composition, which occupies the marginal facies of the ultramafic unit.This chill zone may represent a chill zone which infers an intrusive origin for the ultramafic, or it may represent a zone of metasomatism and/or contamination.The orebody itself is composed of 2 to 6 metres of massive nickeliferous sulfides, usually banded and foliated pentlandite-pyrrhotite-pyrite.