Types de Gîtes:
Orogenic Au, Intrusion-related Au
The O’Sullivan Project covers 27,595 ha of the Abitibi Greenstone Belt (AGB) along the Casa Beradi Deformation Zone (CBDZ). The CBDZ is of the primary structures that controls orogenic gold mineralization in the belt it hosts the active Casa Berardi mine that has produced 1.9 M ounces since 1988 and has proven and probable reserves of 1.7 million ounces (December 31st 2019) and the Nelligan gold deposit that has a 3.2 million ounce inferred resource (October 22 2019). The O’Sullivan project covers ~15km of strike length along the southern margin of the CBDZ where the deformation zone intersects volcanic rocks of the Stoughton-Roquemaure and Kidd-Munro assemblages, which host several significant intrusive related Au-deposits such as the Douay West, Windfall and Langlois deposits.
Emplacement et accès
The project is located approximately 50 kilometers east of the city of Lebel-sur-Quévillon and 150 kilometers northeast of Val-d’Or, Quebec. Local infrastructure includes a power transmission line transecting the property, a railway line ~5km to the north and an extensive network of logging roads throughout the property.
Géologie et minéralisation
The geology of the O’Sulliavan Project consists of volcanic rocks belonging to the Stoughton-Roquemaure and Kidd-Munro volcanic assemblages. Rocks in the northwestern portion of the property associated with the CBDZ are marked by polymictic conglomerates and clastic sedimentary basins which have been moderately to strongly strained. This geological setting is analogous to that of the Casa-Beradi deposit to the west. Within the central and southern portion of the project the geology mainly consists of mafic volcanic rocks, and felsic to mafic intrusive rocks, primarily interpreted from magnetic data. The geological setting in the central and southern portion of the project are analogous to that of the Pusticamica Au deposit directly to the west. Outcrop is scarce as the majority of the project area is concealed by glacial stratigraphy.
Histoire de l’exploration
In general, the O’Sullivan has seen very limited modern exploration when compared to other areas of the AGB. The majority of exploration consisted of diamond drilling (59 diamond drill holes for a total of 9,504m) targeting geophysical anomalies in the north. Within the central and east portion of the project limited glacial till sampling identified strong gold anomalism in till substrate but no follow-up work was documented. The southern portion of the project remains largely unexplored with only a few drill holes targeting discreet geophysical anomalies.
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