Reviews evidence of the close association of certain metals and ore types with particular types of crystalline rocks in the light of the concept that during crystallization, separate magmatic fractions might constitute systems sufficiently closed to permit fractionation and collection of specific metals. Similar fractionation of metals could occur during recrystallization in metamorphic or metasomatic environments. The geochemical characteristics of the associated residual differentiates--the crystallates from which particular ore metals have been fractionated--may be significant as exploration criteria, particularly in virgin or poorly known terrain.

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