Gold mineralization generated by magmatic-hydrothermal systems has traditionally been associated either with porphyry base and precious metal deposits within and peripheral to calc-alkalic intrusions, or with intrusions of alkalic composition. These systems form in convergent margins and are characterized by highly oxidized, I-type or magnetite-series plutons of predominantly intermediate composition; pervasive alteration associated with mineralization is extensive. More recently a new, globally widespread class of intrusion-related deposits in which gold is the principal commodity has been proposed (Fig. 1; Sillitoe, 1991; Hollister, 1992; Newberry et al., 1995; Lang et al., 1997; McCoy et al., 1997; Thompson et...

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