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The Ajax East pit, in the Afton mine district, on the southwestern side of the sub-alkalic Iron Mask batholith, was developed on copper-gold mineralization located 600 m east of the Ajax West pit. Porphyry-style mineralization, mainly pyrite and chalcopyrite, is located at the intersection of two dioritic phases of the Iron Mask pluton.

Pit mapping at 1:750 scale and logging of representative drill core sections in 1992 resulted in the recognition of nine major lithologies and a revised chronological order: (I) Nicola volcanics. (2) picrite, (3) hybrid diorite, (4) pegmatitic hybrid diorite, (5) Sugarloaf diorite, (6) pyroxene gabbro, (7) monzonite dykes, (8) syenite dyke and (9) quartz-eye latite dykes.

Intense albitization in the Sugarloaf diorite is related both spatially and temporally to mineralization. Potassic alteration is most intensely developed in the relatively mafic hybrid diorite and Nicola volcanic units and is also related to mineralization.

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