Where we Operate

O3 Mining has a portfolio of assets in Val-d’Or, Quebec, spanning more than 65,000 hectares. Our projects host 2.86 million gold ounces of M&I resources at 1.18 g/t Au, and 0.77 million gold ounces of inferred resources at 3.04 g/t Au.



Marban Alliance 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 171 mining claims and 3 mining concessions. The property lies at the junction of Dubuisson, Fournière, Malartic, and Vassan townships.

Project Description

Marban Alliance Engineering

Focused on the completion of the Marban Alliance Feasibility Study by Q4 2023

  • Hosts 2.6 Moz Au1
  • Marban Alliance PFS completed on September 2022 post-tax net present value (NPV5%) of C$423M &unlevered IRR 23.2% with 161Koz gold average annual production LOM
  • 54,000 metres Brownfield exploration program
  • Key infrastructure: railway, hydropower, experienced local labour force and technical services

New mineral resource table from the March 2022 resource estimate:

Marban Alliance Regional: Greenfield Exploration ProgramThe minimally drilled area is three times larger than the Marban Alliance Engineering area and hosts numerous historical gold showings.

(M oz)
Au Grade
Measured & Indicated67.72.41.09
Total Resources170.82.61.14


The Malartic property hosts the Marban Alliance 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 Alliance resource, while the Norbenite shear hosts both the Kierens and Norlartic gold resources. The historic Kierens, Norlartic, and Marban Alliance 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 Alliance, Kierens and Norlartic.

The Marban Alliance 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.

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