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This excursion is mainly based on work done by the field trip leader between 1976 and 1977 in the framework of an M.Sc. thesis supervised by Léopold Gélinas and Jean Lajoie at l'Université de Montréal.

By that time, the association of massive sulphides and rhyolites was already well documented in the Rouyn-Noranda district. A large portion of the rhyolites were thought to be flows. However in more recent environments, such as Japan, rhyolitic volcanism is mostly explosive especially near mineralized areas. This association can be explained by the porous nature of pyroclastic breccias that facilitates the circulation of hydrothermal fluids necessary for the formation of volcanogenic deposits.

The eas i 1 y access i b 1 e Don Camp 1 ex crops, put over 90 % of the area and provides a unique opportunity to observe and study volcanic processes that could not otherwise be fully appreciated under normal outcrop conditions or with drill hole data.

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