Abstract
The Chibougamau mining camp, a major gold producer, has so far produced a total of 1,050 mt of gold at an average grade of 1.85 g/tonne. In contrast to a general tendency to group the deposits as vein type with varying compositions, this paper demonstrates the strong influence of regional lithologic and tectonic evolution of the area on the gold mineralization patterns. A syn-volcanic period of mineralization comprises both the volcanogenic massive sulphide and disseminated mineralization, and the subsequent epithermal mineralization. The latter is also associated with evolving volcanic landforms and syn-volcanic intrusions. The emplacement of the typical Archean lode-gold deposits and later Cu-Au deposits of uncertain origin coincides with the syn-deformational (Kenoran) period. The spatial relationship between the east-west-trending shear zones and a north-east-trending fault system is shown to be a possible mechanism for generating added dilatancy during the gold mineralizing phase. A late-to-post Kenoran shear system controlled the emplacement of the last major phase of gold mineralization within a stratiform intrusion.
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