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Urban Barry Greenfields

Property Summary

The Urban-Barry property is 100% owned by Osisko Mining Inc. The Urban-Barry property is located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec, Canada. It is 700 kilometres north-northwest of Montréal, 200 kilometres northeast of Val-d’Or and 115 kilometres east of Lebel-sur-Quévillon. The property comprises 1,997 individual claims covering an aggregate area of approximately 110,748 ha. The actual property is mostly constituted by claims that were acquired at different periods from 2015 to 2017. Osisko mining is currently the largest stakeholder in the Urban Barry greenstone belt with over 40% of the land staked.

Geology

The Urban-Barry property ccurs within the Urban-Barry greenstone belt in the Northern Volcanic Zone of the Abitibi geological subprovince. The Urban-Barry greenstone belt has an east-west extent of 135 kilometers and is 4 to 20 kilometres wide. Rocks of the Urban-Barry greenstone belt were deformed during the Kenoran orogeny. Rocks of the Urban-Barry greenstone belt are generally metamorphosed to greenschist facies, although near intrusions, conditions locally reached amphibolite assemblages (Joly 1990). The regional metamorphic temperature-pressure gradient generally increases eastward towards the Grenville Front.

The Urban-Barry greenstone belt contains mafic to felsic volcanic rock units and is cross-cut by several east-trending and east-northeast trending shear zones that delineate major structural domains: the Urban Deformation zone, a major sub-vertical, east-west-trending and dextral ductile shear zone extending along the northern margin of the greenstone belt (Bandyayera et al. 2002); the central portion of the Urban-Barry belt and consists of a moderate strain fault-related folds style. The main foliation in this domain is oriented east-northeast and contains the Urban Syncline. The central portion of the belt is transected by the east-northeast-trending Milner and Masères ductile shear zones.

The Urban-Barry greenstone belt is divided in four informal rock formations that are aged between 2791 and 2707 Ma (Rhéaume and Bandyayera 2006):

1) The oldest Fecteau Formation (2791 Ma) is located in the southeast limit of the belt. It mainly consists of mafic to felsic volcanics including graphitic sedimentary units (Bandyayera et al. 2004).

2) The Chanceux Formation (2727 Ma) mainly consists of tholeiitic basalt, thin beds of rhyodacitic or rhyolitic tuffs interlayered with greywackes and graphitic argillite (Bandyayera et al. 2004).

3) The Macho Formation (2718 Ma) located in the central part of the belt, mainly consists of basalt, andesite and basaltic andesite with comagmatic gabbroic sills (Bandyayera et al. 2002, 2004). The Macho Formation includes the Windfall and Rouleau members. A series of quartz and/or feldspar porphyry dikes cut across volcanic rocks of the Macho Formation, including rocks of the Windfall Member. The dikes have been dated at 2697 ±0.6 Ma at the Barry gold deposit (Kitney et al. 2011) and at 2697 ±0.9 Ma at the Windfall deposit (Davis 2016, unpublished), which is located approximately 10 km southwest of the Windfall Lake deposit.

4) The Urban Formation (2707 to 2714 Ma) is the largest formation and consists of glomeroporphyritic tholeiitic basalt with minor synvolcanic gabbro inferred to be coeval with the Obatogamau Formation in Chibougamau. It equally includes felsic volcanics and sediments (Bandyayera et al. 2002).