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Projects

Quévillon

Property Summary

The Quévillon property is 100% owned by Osisko Mining Inc. The Quévillon property is 160 kilometres of the city of Val-d’Or in the province of Québec. The Quévillon Property consists of 4,211 non-contiguous mining titles, this land package covers 2,244 square kilometres. The property is centred around the town of Lebel-sur-Quévillon.

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Project Description

Geology

The Quévillon property occurs in the Northern Volvanic Zone of the Abitibi subprovince, part of the Archean Superior Province. The Abitibi subprovince hosts some of the richest mineral deposits of the Superior Province.

The geology of the Quévillon property is dominated by undifferentiated mafic and intermediate volcanic rocks of basaltic to andesitic compositions; felsic volcanic and volcaniclastic rocks of dacitic to rhyolitic compositions; and local interlayers of various sedimentary rocks (argillites, graphitic shales and iron formations). The stratigraphy trends east-west resulting from regional east-trending folds, with the Lamarck-Wedding Fault passing through the Property. The rocks are mainly metamorphosed to greenschist facies, locally reaching amphibolite facies along the fringes or margins of late intrusive stocks. Bedrock exposures are generally scarce on the Quévillon Property with most of them found on the Western and Northeastern blocks and eastern portion of the Central Block.

Osborne-Bell

The geology of the Osborne-Bell area is characterized by a package of synvolcanic felsic units, enclosed within a broad package of mafic volcanic rocks. The stratigraphy trends west-northwest and dipping steeply to the north, changing to north northeast-south southwest in the northeastern part of the property and to norhteast-southwest in the western part of the property. These changes in orientation may be related to the presence of numerous intrusions and regional deformation. The most important intrusions are the Comtois Stock and Beehler Stock.

The structural data demonstrates that the change in lithological orientation is caused by the presence of a fold, not a fault, thereby confirming the stratigraphic continuity between Osborne-Bell and the Eastern Extension.

The typical Osborne-Bell lithological succession and mineralization intersected in drill holes from north to south include mafic volcaniclastic units containing trace to 3% sulphides (rarely 5%), with the percentage increasing to 5% near the contact with the main felsic units. The main felsic units generally contain 1% to 3% sulphides. Drill holes were then stopped in the barren Beehler Stock, which marked the end of the favourable sequence. Drill holes in the Midway area intersected another mafic volcaniclastic unit after the main felsic package, before ending in the Beehler Stock.

Osborne-Bell deposit – gold mineralization

The Osborne-Bell area hosts the Osborne-Bell disseminated pyrite gold deposit (±Ag, ±Cu, ±Zn), volcanogenic massive sulphide mineralization (±Zn, ±Pb), and other occurrences of gold and zinc. There has been improvement in the understanding of this deposit type in recent years, the current interpretation of the Osborne-Bell area geology is based primarily on drill hole and geophysical data. The deposit can be subdivided from west to the east into five zones: Bell VMS, Bell, Midway, Osborne and Camten. These zones are historical names given at the time of there discovery and are all part of the same mineralized system. The sulphide-rich gold mineralization of the Osborne-Bell deposit extends over a 1,900-metre up to 430 metres wide and is known to a vertical depth of 700 metres below surface in the Osborne area.

Gold-bearing mineralization is characterized by disseminated sulphides, concentration of sulphides in millimetre- to centimetre-scale lenses and by millimetre-scale stringers and veinlets of fine-grained sulphides. Higher-grade stringers and veinlets display two main orientations: one parallel or subparallel to schistosity, and the other perpendicular to it. Sulphide minerals are typically pyrite with some pyrrhotite, chalcopyrite and sphalerite. Higher gold grades are generally associated with the presence of 5% to 10% sulphides mainly occurring as sulphide stringers and veinlets with minor chlorite.

In addition to gold, many intervals in the Osborne-Bell deposit returned significant results for copper (Cu), zinc (Zn), silver (Ag) or lead (Pb), or a combination thereof. In many cases, gold is present in intervals with base metal grades. The most significant zone is in the Osborne area, where gold, silver, copper and zinc are strongly associated

Volcanogenic massive sulphide (VMS) mineralization has been documented in the western extremity of Osborne-Bell (Bell-VMS area). Anomalous zinc and lead values have been documented in drill core from this area. Zinc contents exceed 1.0% in places (Fig. 7.13), and in these cases, narrow sphalerite stringers are observed in graphitic black shales. Lead, which is rarely present in concentrations greater than 0.5% Pb, is typically associated with anomalous zinc values.

2018 Osborne-Bell Deposit Inferred Mineral Resource Estimate

Cut-off Grade Tonnage Au g/t Ounces
3.00 g/t 2 587 000 6.13 510 000

 

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