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Location: 52 km W from Wawa, Ontario, Canada
93 Mission Road PO Box 1520WawaOntario, CanadaP0S 1K0
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The Mishibishu greenstone belt is a broad arcuate syncline 55 km long in an east-west direction and 16 km wide in a north-south direction. This belt is part of the Wawa Subprovince of the Archean-age Superior Province. Supracrustal rocks in the belt are dominated by greenschist facies mafic to intermediate volcanic rocks with lesser sedimentary rocks including iron formation and intermediate to felsic volcanic rocks. The belt is surrounded by Archean granitic rocks and includes two internal granitic batholiths occupying the central portion of the belt. Minor intrusions include synvolcanic stocks and sills of intermediate to felsic composition and an array of northeast and northwest striking late Precambrian diabase dykes.The northern limb of the belt, where the Mishi Mine is located, is dominated by an assemblage of clastic sedimentary rocks, felsic tuffs, and mafic flows. The southern limb, where the Eagle River Mine is located, is dominated by tholeiitic basalts and calc-alkaline andesites with minor interflow clastic sedimentary rocks and lean chert-magnetite iron formation. In this area, the supracrustal rocks form a steeply north-dipping and north-facing sequence displaying moderate to steep eastward plunges defined by minor fold axes and mineral lineations.Gold in the Mishibishu Lake greenstone belt occurs primarily in quartz vein deposits located within regional zones of deformation. The Mishibishu Deformation Zone follows a volcanic-sedimentary contact in the north limb of the belt hosting the Magnacon and Mishi deposits, while the Eagle River Deformation Zone hosts the Eagle River deposit along the south limb of the belt.Late northeast striking and lesser northwest striking faults and fractures offset the greenstone stratigraphy and deformation zones.Mishi Mine Mineralization is hosted in the Mishibishu Deformation Zone, which traverses the property over 14 km and is interpreted as a major regional thrust fault, which follows a volcanic-sedimentary contact. The northern portion of the property is underlain by mafic volcanic rocks and subvolcanic gabbroic sills. These are overlain to the south by shallow water immature arenaceous/arkosic sediments and polymictic conglomerates, followed by deeper water silts and turbidites progressing southward.The sequence is overturned, dipping moderately north, facing south and striking 90° to 120°. The deformation zone is 0.5 to 1.0 km wide and characterized by strong ankerite alteration and a schistose fabric dominated by phyllosilicate minerals, sericite and chlorite. Because of the intense deformation, systematic recognition of protoliths and subunits within the deformation zone is problematic.In the Mishi Mine area, mineralization is hosted by a series of at least 8 tabular parallel zones consisting of ankerite-sericite ± chlorite alteration zones containing 2-8% fine disseminated pyrite and a system of sub conformable, dislocated, smoky grey quartz veinlets and lenses. Veins generally vary from 5 to 20% of the bulk volume of the zones with individual quartz lenses commonly 5 to 15 cm wide. The zones strike 100°, dip north 40° and plunge northeast. In general, the zones become more felsic, discrete, and vein dominated towards the north.
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