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Abstract

Ajax West pit (50°37ʹN, 120°24ʹW), in the Afton mine district, lies 13 km west of Kamloops and 420 km northeast of Vancouver, B.C. The pit, on the southwestern side of the alkalic Iron Mask batholith, was developed on copper-gold mineralization at the intersection of three major rock units: two dioritic units of the Iron Mask pluton and a picritic unit of uncertain origin. Porphyry style mineralization is mainly pyrite and chalcopyrite with minor amounts of bornite and chalcocite. Alteration includes intense albitization and less intense K-feldspar, epidote and chlorite ± anhydrite and diopside.

Field work consisted of pit mapping at 1:750 scale and detailed core logging of representative sections. Eleven major lithologies are recognized and arranged in a preliminary chronological order, from oldest to youngest: (1) picrite, (2) monzodiorite, (3) Sugarloaf diorite, (4) pyroxene gabbro, (5) hybrid diorite, (6) pegmatitic hybrid diorite, (7) dioritic dykes, (8) plagioclase porphyry dykes, (9) Cherry Creek monzonite dykes, (10) magnetite-rich diorite dykes, and (11) quartz-eye latite dykes.

Future work will refine descriptions of the lithologies and explain alteration and structural relationships

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