Where we Operate

O3 has a portfolio of assets in Quebec and Ontario, spanning more than 460,000 hectares. Our projects host resources of 2,066,154 gold ounces of measured and indicated resources at 1.40 g/t Au.

Chibougamau Matagami Timmins Val D'or


Val D'or

Cadillac Break Properties

Property Summary

The Cadillac Break Properties are located in the southeastern Abitibi Greenstone Belt of the Archean Superior Province in the Canadian Shield. The properties are located in the Val D’Or municipality of the Abitibi-Temiscamingue administrative region in the Province of Quebec. They are easily accessed via all-season public paved roads, public gravel roads, all-terrain vehicle trails, and bush roads. The Cadillac Break Properties are located at the boundary between the Abitibi Subprovince and the Pontiac Subprovince, which is marked by the Cadillac-Larder Lake Fault zone (CLLFZ) and stretch for over 35 km along the break. The CLLFZ is a regional-scale strike fault and/or shear zone and is one of the most important structural controls on the gold mineralization in the Abitibi Greenstone Belt, which has produced 100 million ounces of gold since the early 1900’s. Discoveries in the region (Lapa and Goldex), at depths between 500 and 1,500 meters, show that the Cadillac Break Group of properties is highly under-explored, as most recent drilling has been in the upper 150 meters over the whole package, only locally testing down to 300 meters depth.


Malartic Property

Property Summary

The Malartic property is located in the western portion of the province of Quebec, Canada, about midway between the towns of Val D’Or and Malartic and is comprised of 30 mining claims and 3 mining concessions. The property lies at the junction of Dubuisson, Fournière, Malartic, and Vassan townships.

Project Description


The Malartic property hosts the Marban project, which lies within the Archean Abitibi greenstone belt of the Superior Province, Quebec, 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 Malartic 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, 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.

Gold Mineralization

Gold mineralization at the Malartic 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, previous operators have been actively exploring sub-parallel gold-mineralized horizons within the Malartic property at the North-North, North, and Gold Hawk zones. The most significant gold
mineralization defined to date is currently known in 3 main zones: Marban, Kierens and Norlartic.

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

  • An alternating sequence of sheared ultramafic volcanic rocks 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.


Harricana Property

Property Summary

The Harricana property is located 9 km northeast of the town of Val D’Or, on the eastern shore of Blouin Lake, and hosts the Aurbel deposit. The property is accessible by Highway 397 from the town of Val D’Or.

Geologically, the property is underlain by two distinct units; the Dubuisson Formation, consisting of massive mafic flows, porphyritic flows and breccia flows, and the Bourlamaque Batholith (granodiorite and quartz diorite). The contact between these two units is a major shear zone, which hosts the main mineralization.

Gold mineralization occurs in quartz veins associated with various shear zones. The Aurbel deposit mineralization occurs in two sets of quartz veins within the main shear zone. In the volcanic units, mineralization is hosted in smoky quartz, with minor tourmaline stringers and local concentrations of ankerite. Sulphides occur as finely disseminated pyrite and local chalcopyrite and pyrrhotite. Quartz veins in the main and minor shear zones within the Bourlamaque Batholith are composed of white quartz, tourmaline and chlorite patches, with coarse-grained pyrite often associated with higher gold grades.

Alpha Property

Property Summary

The Alpha Property has been explored by various operators since the early 1930’s, with more than 2,400 drill holes completed since that time. Other work includes multi-property geophysical and geochemical programs, and trenching and mapping, all of which are being compiled into a single database. Discoveries in the region (Lapa and Goldex), at depths between 500m and 1,500m, show that the Cadillac Break Group of properties are highly under-explored, as most recent drilling has been in the upper 150m over the whole package, only locally testing down to 300m depth.

Project Description


Geologically, the dominant feature underlying the properties is the Cadillac Break; a regional fault zone that separates metasedimentary rocks of the Pontiac Group on the south side from predominantly volcanic rocks and associated intrusive rocks on the north. However, this large property package hosts a variety of geological environments favourable for gold mineralization, including those, which are known elsewhere to host large gold deposits, including:

  • Shear- Zone

  • Gold-rich massive sulphide

  • Porphyry gold-copper and skarn

  • Disseminated gold

  • Gold Mineralization

The most significant gold mineralization defined to date is currently known on the Alpha property. Gold mineralization in Orenada Zones 2 and 4, within the Alpha property group of claims, share many geological attributes with other vein-type gold deposits of the Val D’Or district in terms of host rock composition, mineralogy and hydrothermal alteration, also known as orogenic gold deposits. The gold mineralized “corridors” at Alpha have been interpreted based on drilling, historic showings and the style of mineralization identified in drill core and field observations (see Alpha Map). The main targets on the Alpha property include Bulldog, Epsilon, Pontiac East/West, Mid-Canada, and Akasaba.

East Cadillac Group

Property Summary

The immediate vicinity of the East Cadillac Group has been the focus of exploration activity since the mid-1940s when gold-bearing structures were found near the Cartier Resources Chimo Gold Mine (now closed), which operated for nearly 15 years and produced over 349,000 ounces until its closure in late 1996. The East Cadillac Group hosts numerous catalogued gold occurrences, several with historic resources. The Nordeau West deposit, 1,500 m east of the closed Chimo Mine, hosts a NI 43-101 Mineral Resources, the only current resource on the property, with an inferred resource of 1.1 Mt at 4.09 g/t.

The properties comprising the East Cadillac Group overlay a highly sheared sequence of altered greywacke, iron formation and mafic volcanic rocks along nearly 15 kilometres of strike. Gold mineralization is found associated with quartz veins containing disseminated to semi-massive sulphides, typically within sedimentary rocks in close association with magnetite iron formations or sheared and altered mafic volcanic rocks.


Kinebik Gold Property

Property Summary

The Kinebik Project is located in northern Quebec, halfway between the towns of Lebel-sur-Quevillon and Matagami and a two and a half-hour drive from Val D’Or, Quebec. The project area can be accessed year-round via paved and unpaved roads. The property is composed of one contiguous block of 333 claims, making up 18,200 hectares. The property covers greater than 30 km of strike along the Casa Berardi Fault. The Casa Berardi fault hosts the Casa Berardi gold deposit, the largest deposit in the region (c. 6Moz Au), and is located 150 km to the west of the property. Most of the exploration on the property was completed between 1980-1995. In total, 47 diamond drill holes and several prospecting and geophysical surveys have been completed on the property.

Geologically, the property is situated within the north-central portion of the Archean Abitibi Subprovince, in the Harricana-Turgeon Belt, which comprises the Matagami and Taibi volcano-sedimentary basins. It is associated with the Taibi Group, which is defined by the Taibi Fault to the North, and the Casa Berardi Deformation Zone to the south. The project area is part of the Casa-Berardi Tectonic Zone, and is along strike from Douay, Vezza, and Discovery deposits. Major lithological units comprise a mixed assemblage of turbidite-type sedimentary sequences, lesser mafic volcanic and felsic plutonic rocks. The primary area of interest has been the major zone of shearing and hydrothermal alteration at the contact between the clastic sedimentary rocks and mafic volcanic rocks.


Gwillim Property

Property Summary

The Gwillim property is located in the Barlow township, close to Chibougamau, consisting of 38 mining claims, covering 1715 Ha.

Project Description


The Gwillim property is underlain by massive and pillowed mafic to intermediate volcanics of the upper Gilman Formation. Andesite predominates in the north, whereas basalt is dominant in the southern half of the property. Pillows indicate tops to the south. The volcanics are locally intercalated with volcanoclastic sediments, which occur on the north flank of the east trending Chibougamau syncline. The Blondeau Formation, a series of felsic volcanic and volcaniclastic rocks and graphitic shales, underlies the southwest part of the property.  Dioritic and gabbroic sills, up to 250m wide, intrude the volcanic units parallel to the lake. These are considered co-magmatic with the host volcanic rocks. The volcanics and intrusives rocks host disseminated and fracture filling pyrite and occasionally pyrrhotite and chalcopyrite. The sills are magnetic with disseminated magnetite and in the diorite the magnetite is not evenly distributed. All of the volcanic units are carbonatized with calcite forming along foliation planes and microfractures, and pervasive chlorite alteration.

Gold Mineralization

Gold mineralization on the Gwillim property appears to be related to an early episode of east-west shearing, in turn possibly related to the Gwillim Lake. The Cadillac vein, as an example of this, consists of milky to smoky quartz with ankerite, chlorite, sericite, tourmaline and varying amounts of pyrite and traces of chalcopyrite.  Gold mineralization is erratic and discontinuous with local very high grades.



Golden Bear Group

Property Summary

The Garrison Project is located in Garrison Township, Larder Lake Mining Division, approximately 40 km north of Kirkland Lake and 100 km east of Timmins, Ontario (Figures 1).  The Garrison Project belongs to the Golden Bear Properties which are made up of 16 non-contiguous claim groups (Figure 2).

Project Description


The Golden Bear Group of properties, situated in the Abitibi Greenstone Belt (AGB), are underlain by Neoarchean supracrustal rocks of the Abitibi Subprovince of the Canadian Shield. Gold deposits in the area are structurally controlled and are widely distributed within the AGB, but all the large deposits occur within 2 kilometres of the Porcupine-Destor Fault Zone, the Pipestone Fault Zone or the Cadillac-Larder Lake Shear Zone.

The Garrison Project is underlain by rocks of the Kidd-Munro and Timiskaming Assemblages and about 4 km of the regionally significant Destor-Porcupine Fault Zone and a major splay, the Munro Fault Zone (Figure 3).

The Kidd-Munro Assemblage is comprised of massive to pillowed, mafic (high magnesium and iron tholeiites) and ultramafic (komatiite) metavolcanic rocks. The metavolcanic flows strike in a general east-west direction and dip steeply to the south. The Timiskaming Assemblage is composed of clastic metasedimentary rocks, consisting of conglomerate, wacke-sandstone, siltstone, argillite and schist, and is closely associated with the Porcupine Destor deformation zone from the Quebec border to Hislop Township, a distance of approximately 65 km (Berger, 2002).  Banded magnetite-hematite iron formation is complexly interbedded and structurally interleaved with clastic metasedimentary rocks. The Timiskaming Assemblage is younger than the Kidd-Munro Assemblage, and in the absence of faults, the contact between the assemblages is an angular unconformity.  On the property, the Timiskaming Assemblage is fault-bounded on the north side by the Munro fault and on the south side by the Porcupine-Destor fault.

Gold Mineralization

The most significant gold mineralization defined to date is currently known in 3 main zones; Garrcon Deposit, Jonpol Deposit, and 903 Zone.


The Garrcon Deposit, comprises a broad zone of low-grade gold mineralization that includes local higher-grade areas.  It occurs within the Timiskaming Assemblage adjacent and to the north of the Porcupine-Destor fault and to the east of the north-south trending Garrison fault.  It is a zone of brecciated, silicified metasediments with stockwork type quartz-carbonate veins and veinlets and minor disseminated sulphides cut by narrow variably altered lamprophyre and syenite dikes. Gold occurs primarily as native gold within the stockwork veins with minor dissemination into the vein walls


The Jonpol Deposit, was the primary exploration target on the property in the 1980s and 1990s and is defined by a zone of gold mineralization hosted in structurally controlled alteration zones within mafic and ultramafic rocks along with the north contact of the Munro Fault, which crosses the north-central part of the property. Jonpol gold mineralization is generally associated with pervasive carbonate alteration with late-stage silicification, sulphidization (pyrite and arsenopyrite) and sericitization, giving the altered rock a pale beige to pale purple-grey hue.


Extensive drilling by Osisko Mining Inc. in 2016 to 2018 has helped classify the mineralization style at the 903 Zone as a traditional “syenite associated deposit”.  The syenites are typically hosted by deformed ultramafic rocks, although they less commonly occur within the mafic volcanics. Although no geochronology has been conducted, the syenites are likely associated with the Timiskaming magmatic event, recognized along the Abitibi, with alkaline characteristics, which occurred approximately between 2,680 and 2,672 Ma (Corfu et al, 2001).  Host rocks consist of albite-sericite-chlorite altered ultramafic to mafic volcanics.  Alteration primarily consists of albite-hematite-specularite.

Other Properties

Wydee Gold Property

Property Summary

The Wydee Project is located approximately 6 kilometres west-northwest of the town of Matachewan, Ontario, 60 kilometres west of Kirkland Lake and 50 Kilometres south-southeast of Timmins, Ontario. The eastern boundary of the Wydee project is located 6 kilometres northwest of Alamos Gold’s Young Davidson Mine. The Young Davidson Mine complex also includes a fully operational 10,000 tons per day mill.

Geologically, the property is located in the Archean Abitibi Greenstone Belt and is mainly underlain by steeply dipping mafic to intermediate volcanic rocks, that are intruded by ultramafic to felsic intrusions of various sizes. The eastern part of the property covers an 8 kilometres E-W strike along the Galer Branch Deformation Zone, a splay of the Larder Lake Cadillac Deformation Zone.

The property hosts numerous gold occurrences that remain largely underexplored. Mineralization mostly consists of visible gold in narrow quartz veins, as well as associated with disseminated pyrite within or at contacts to altered syenitic intrusions.

Matachewan Property

Property Summary

The Matachewan property is located in the southwest portion of Cairo Township in the Mining District of Timiskaming, Ontario. The property is located 1.5 km East of the town of Matachewan, Ontario. The property consists of 35 mining titles. All claims are in good standing and verified on the website of the Ministry of Northern Development and Mines. The infrastructure and accessibility are excellent as it is located on the east side of Matachewan, a community with a long mining tradition, and is bisected by Highway 66.

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A Year
in Review









To Our
O3 Mining

What a year it has been! I want to personally thank you for supporting O3 Mining throughout this unprecedented time. At O3 Mining we experienced a year of tremendous growth as our exploration campaigns surpassed all expectations and we invested significant capital into our projects.

Our Year In Review









A Year
in Review









What a year it has been! I want to personally thank you for supporting O3 Mining throughout this unprecedented time. At O3 Mining we experienced a year of tremendous growth as our exploration campaigns surpassed all expectations and we invested significant capital into our projects.

Our Year In Review