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Location: 19 km NE from Val-d’Or, Quebec, Canada
776, Chemin PerronVal-d’OrQuebec, CanadaJ9P 0C3
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Gold mineralization at the Beaufor Mine occurs mainly as coarse pyrite with gold inclusions and occasionally as free gold within a complex vein system. These veins are spatially related and parallel to late dioritic dikes that cross-cut the granodiorites. According to Tessier (1990), two main mineralization episodes have been observed at Beaufor. The first is associated to the late stages of crystallization of the Bourlamaque Batholith. This magmatic hydrothermal mineralization can be observed in sub-vertical centimetric quartz, chlorite, pyrite, chalcopyrite and molybdenite veinlets. These veinlets usually strike towards the northeast and grade below 5 g/t Au. The second event contains most of the gold bearing veins, which have been mined to this point. These gold bearing veins are sub-metric to metric in thickness and composed of quartz, tourmaline and carbonate containing 5-10% of large cubic pyrite aggregates with occasional traces of chalcopyrite and pyrrhotite. These veins typically strike at N115° and dip south from 30° to 65°. Mineralization Types Gold mineralization occurs in quartz-tourmaline fault-fill veins associated with extension fractures in shear zones, which dip moderately south. Gold-bearing veins show a close association with the mafic dikes that intrude the granodiorite. The dikes are interpreted to have influenced the structural control of the gold-bearing veins. The sulphide content within the veins is generally less than 10%, and the principal mineral is pyrite with some minor chalcopyrite and pyrrhotite. Locally, native gold is seen to have infilled voids inside pyrite crystals (Pelletier and Langton, 2020). Veins strike at N115° and dip moderately to the south from 30° to 65° (Thelland and Manda Mbomba, 2016). The thickness of the veins varies from 5 cm to 5 m, but generally, the thickness of the quartz veining system is 30 cm to 120 cm. All the gold-bearing veins are contained in a strongly altered granodiorite in the form of chlorite-silica forming anastomosing corridors 5 m to 30 m thick. The veins at the Beaufor Mine sometimes form extended panels (Pelletier and Langton, 2020). Some major mineralized zones, e.g., the C and Q zones, have been traced along strike and down dip for 450 m x 250 m and 550 m x 250 m, respectively. The multiple vein systems of the Beaufor deposit are cut and split apart by numerous steeply dipping discreet shear zones. The Beaufor Fault marks the limits of several major mineralized zones. The Beaufor Fault may have been one of the main conduits for mineralizing hydrothermal fluids at the Beaufor Mine. Several post-mineralization faults intersect and displace the quartz veins. Mafic dikes that predate mineralization are associated with shear-hosted gold-bearing veins. Shallowly dipping extensional gold-bearing veins are commonly observed at the Beaufor Mine. The main gold-bearing quartz veins are intimately associated with dioritic dikes (Pelletier and Langton, 2020).
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