A gold mine in a variably sheared, faulted, carbonatized and mineralized sequence of komatiitic ultramafic volcanics, belonging to the Stoughton-Roquemaure Group strikes southeast across the property, along the southeast strike of the DPFZ. This structure and the surrounding stratigraphy dip to the southwest at approximately 45 degrees. These altered and deformed komatiites are generally bleached to a light grey-buff colour with ankerite-talc and ankerite-quartz-sericite-fuchsite assemblages. This alteration package is underlain to the north by a thin, fine grained, green greywacke-type sediment unit, a thick sequence of massive to pillowed tholeiitic mafic volcanics and lastly by the regionally extensive package of argillites and wackes of the Porcupine Group sediments which underlie the northeastern portion of the property. To the south and forming the hanging wall of the main ankerite zone are relatively undeformed very fine-grained and green pillowed tholeiitic mafic volcanics with lesser intercalated black chloriteserpentine, chlorite and talc-chlorite altered komatiitic ultramafic flows. Numerous syenitic and feldspar +/- quartz porphyry sills and dykes of various ages occur, primarily within the main ankerite alteration zone. They are commonly massive to brecciated, silicified and pyritic with occasional sericite and hematite alteration and a more common black chlorite alteration at the contacts. They vary in colour from pink, grey, whitish, yellow, pale green and reddish. Within the more strongly deformed green carbonate zones, fragments of these dykes frequently occur. Very narrow massive, dark green to buff-green mafic dykes and sills commonly occur within the main ankerite zone. They are generally weakly altered and probably post-date much of the alteration and deformation. Diabase dykes are the youngest rocks in the area, occupying very late north-striking crustal fractures.
7 entries listed. 6 valid minerals.
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MDI Number: MDI42A09SW00165