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Location: 0 km E from Timmins, Ontario, Canada
4315 Gold Mine RoadSouth PorcupineOntario, CanadaP0N 1H0
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Dimensions Mineralization at Hollinger has been defined over 1.6 km of northeast strike, generally plunges moderately to the northeast and was mined to depths of 1670 m below surface. The Hollinger mineralization connects with that defined at the McIntyre mine which has been extracted to depths of over 2700 m approximately 500 m to the northeast. The overall strike of both the Hollinger and McIntyre vein system has been defined over more than 3.1 km of strike. Mineralization remains open at depth and parallel veins likely persist. Veins have individual widths of less than 1 m to approximately 20 m and zones of multiple parallel veins exists to over 100 m widths at lower levels in the former operations. Near surface, zones of parallel veins can reach over 300 m in width.StructureThe Hollinger–McIntyre–Coniaurum mineralization complex is located on the north limb of the Porcupine Syncline, a major east-plunging basin structure. The “Central Ore Zone”, located principally at Hollinger, crosscuts a highly strained area between the Millerton Porphyry to the southwest and the Pearl Lake Porphyry to the northeast. Deformation intensity decreases to the north and south of the “Central Ore Zone” as indicated by weaker planar fabric development and preservation of original textures. The Hollinger fault extends from the Millerton Porphyry through the Pearl Lake Porphyry dipping steeply to the south, and has an apparent left-lateral displacement of approximately 460 m on the west end with almost negligible displacement observed to the east in the Pearl Lake Porphyry, where it appears to feather out and dissipate within the Pearl Lake Porphyry. The Hollinger fault is part of a braided fault network located in the “Central Ore Zone”.Mineralization Mineralization is spatially related to the Pearl Lake porphyry and to the Hollinger Main Fault, which is a high-strain zone of lineation and constrictional strain development with no identified offsets. The principal mineralization type consists of massive, white quartz veins and stringers with well-developed pyrite-carbonate and ankerite-sericite alteration envelopes. Mineralized wall rock contains gold intimately associated with pyrite. Minor free gold commonly occurs along the vein margins. Pyrite within host rocks is the main sulphide, and minor components include scheelite, albite, and tourmaline.In massive lithologies (99 flow), mineralization occurs in quartz-filled brittle fractures with mineralized alteration envelopes and increased free gold. In breccia and fragmental units, mineralization occurs in highly pyritized wall rock.Vein systems are present as en-echelon veins, quartz veins with branching stringers and individual veins. Gold may be confined to quartz in some veins but in others, it is associated with pyrite in the adjacent wall rock.Veins are classified as either shear or tension veins. Right lateral shear veins strike approximately east to northeast, have relatively long strike lengths, and dip to the south. Left lateral shear veins trend north to northeast, have shorter strike lengths, and dip steeply to the north. Tension veins occur between well-developed shear veins as west dipping flatter veins at approximately 45°. The 99 flow also hosts well developed tension veins.
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