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MARBAN BLOCK PROJECT

SUMMARY

1.1 Introduction

Updated Mineral Resource Technical Report – Marban Block Property

Belzile Solutions Inc (BSI) was commissioned by Osisko Mining Inc. (“Osisko”) to prepare an independentestimate of the mineral resources of the Marban Block property, which includes the Marban, Norlartic and Kierens deposits.

The Marban Block property is located in the western portion of the province of Québec, Canada, about midway between the towns of Val-d’Or and Malartic. Osisko holds a 100 percent interest in the project.

This technical report documents the fifth Mineral Resource Statement prepared for the Marban Block property pursuant to the guidelines of the Canadian Securities Administrators’ National Instrument 43- 101 and Form 43-101F1. The previous mineral resource models were prepared by SGS Canada Inc (SGS) in October 2012 and by Mine Development Associates in 2007, 2010 and 2013. The background information in this report is derived primarily from those previous technical reports and the original technical report by Carrier (2006) in compiling the text, figures, and tables for the portions of this report not related to the resource estimation.

The Mineral Resource Statement reported herein was prepared in conformity with generally accepted CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines.

1.2 Property description and ownership

The Marban Block property which contains the resources that are the subject of this report is the result of the amalgamation of the contiguous Gold Hawk, First Canadian, Norlartic, and Marban historical properties. Osisko owns a 100% interest in the Marban Block property.

On March 16, 2015, the claims of the Marban Block were converted in new CDC claims. Thus the property surface was slightly increased so now, it covers 1023.13 hectares and comprises 30 mining claims and 3 mining concessions. The mining claims and concessions that comprise the Marban Blockproperty are listed as being in good standing on the MRNQ ‘Gestim’ claim management website.

Table 4.2 summarizes the net smelter returns (“NSR”) and net profits interest (“NPI”) royaltiesapplicable to production from the Gold Hawk, First Canadian, Norlartic, and Marban historical properties and payable to companies previously involved with the property.

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Updated Mineral Resource Technical Report – Marban Block Property

As per the option agreement with Aur dated February 3, 2006, upon a decision to proceed to production on any deposit located on the Norlartic, First Canadian, and Marban historical properties, Osisko must make a one-time production payment of CAD$5,000,000 to Aur (now Teck Resources Ltd). On December 18th, Osisko Gold Royalties (Osisko GR) bought the Teck NSR and payment rights.

1.3 History

Exploration conducted at the Marban Block property apparently dates back to at least 1940 and includes geologic mapping, sampling, compilation of geological, structural, and geochemical data, geophysical prospecting, trenching, and extensive drilling from the surface and underground. At least 14 different companies explored and/or mined on parts of the property in the period of 1940 through 1994.

Since first gaining interests in the property in early 2006, NioGold (now Osisko), including the work of the Aurizon- NioGold joint venture, has carried out the following activities at the Marban Block property:

1.4 Geology and mineralization

The Marban Block property lies within the Archean Abitibi greenstone belt of the Superior Province, Québec, which consists of alternating east-trending metavolcanic-plutonic and sedimentary belts that are bounded by crustal-scale faults. The metavolcanic rocks within the Malartic mining district are composed of allochthonous komatiitic to tholeiitic volcanic suites that are interpreted to have been derived from volcanic plateaus and volcanic islands juxtaposed during the late Archean.

The metavolcanic rocks within the Marban Block property are cut by three major northwest to westnorthwest-striking shear zones of regional extent – the North, Norbenite, and Marbanite shears. The Marbanite shear hosts the Marban resource described in this report, while the Norbenite shear hosts both the Kierens and Norlartic gold resources. The historic Kierens, Norlartic, and Marban gold mines all exploited zones lying within the basalts and ultramafic rocks of the Jacola Formation, which have been intruded by numerous diorites and felsic porphyry dikes and sills.

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Updated Mineral Resource Technical Report – Marban Block Property

Gold mineralization at the Marban Block property occurs primarily as mesothermal deposits that lie within the north-dipping shear zones and associated felsic to intermediate sills and dikes. In addition to the resource areas, Osisko has been actively exploring sub-parallel gold-mineralized horizons within the Marban Block property at the North-North, North, and Gold Hawk zones.

The Marban resource is located on the northern flank of a west-northwest-trending syncline. From north to south, the units include:

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An alternating sequence of sheared ultramafic volcanic rocks (now talc schist) and granodiorite dikes;

The “Mine Sequence” of pillowed, sheared, aphanitic and fine-grained basalts; and Sheared and massive or pillowed ultramafic volcanic rocks.

These units dip 45 to 70° to the north. The mineralized zones occur almost exclusively within the Mine Sequence basalts, which frequently have been converted to chloritic schists within the Marbanite shear. Gold is associated with quartz-carbonate veinlets, pyrite, and pyrrhotite. There is also disseminated replacement-type gold mineralization in tholeiitic-komatiitic volcanic rocks of the Jacola Formation, and locally there is gold in granodioritic dikes.

The Kierens and Norlartic resources are localized in the Norbenite shear, an important northwest trending deformation zone that dips moderately to steeply northeast. Mafic volcanic rocks, talc-chlorite schists, and felsic dikes are included within the shear zone. The gold mineralization is closely associated with altered and pyritized intermediate intrusions that cut sheared mafic and ultramafic volcanic rocks.

The Norlartic resource includes mineralization within the Main zone, which lies west of the Norlartic shaft and was the focus of historic mining. The extension of the Main zone east of the shaft, as well as the Actinolite zone that lies in the hanging wall of the Main zone, are also included in the resources. The Main zone mineralization occurs within and adjacent to a sill or dike that occurs within a wide envelope of sheared mafic rocks in the core of the Norbenite shear. Gold is usually directly associated with the intrusion in quartz-calcite-pyrite veinlet stockworks. In contrast to the Main zone, the Actinolite zone is not lithologically controlled, but instead it appears to be an actinolite-bearing alteration zone that overlaps various units of mafic or ultramafic volcanic rocks. Gold is disseminated without regard to lithology in the Actinolite zone.

The Kierens resource occurs in a strongly silicified and carbonatized alteration zone that occupies the central portion of the Norbenite shear, which dips steeply to the north in this area. The alteration and mineralization transect ultramafic rocks, more massive mafic units, and felsic intrusions. A westerly plunging drag fold may exert the main control on gold mineralization at Kierens. In addition to this type of mineralization, there are native-gold-bearing quartz veins at Kierens.

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Updated Mineral Resource Technical Report – Marban Block Property

1.5 Exploration and drilling

The two Marban Block property drill-hole databases were provided to BSI by Osisko, who acquired the historic database, fixed errors and inconsistencies, and incorporated Osisko’s drill data. The Osisko databases used for the resource estimates contain collar coordinates and geologic and assay information for a total of 4,577 drill holes; the database for the Marban deposit also includes 1,356 channel samples.

A total of 2,024 holes contributed assay data to the Marban resource estimate, 715 holes to the Kierens estimate, and 1,838 holes to the Norlartic estimate. Of these holes, 587 were drilled by Osisko at Marban, 45 at Kierens, and 90 at Norlartic.