O3 Mining Inc. is a Canadian mineral exploration and development company focused on advancing gold projects in Quebec. Trading on the OTCMKTS under the ticker OIIIF, the company concentrates on high-potential properties within established gold belts, including the Abitibi Greenstone Belt and the Cadillac Break. Its primary activities encompass exploration drilling, resource delineation and metallurgical testing aimed at defining and expanding economic gold deposits.
The company’s flagship assets include the Wasamac gold project near Val-d’Or and the Marban property in the Bousquet sub-zone. At Wasamac, O3 Mining has completed multiple drilling campaigns to infill and extend known mineralization, while Marban has seen both brownfields and greenfields exploration programs to grow the resource base. Targeted studies—ranging from geophysics to environmental baseline work—support the advancement of these projects toward pre-feasibility and permitting stages.
Formed through the consolidation of several Quebec-focused exploration firms in 2019, O3 Mining has pursued a strategy of building scale across contiguous land packages. The company maintains a head office in Montreal and operates a regional field office near Rouyn-Noranda to support on-site operations. Its leadership team is led by Jean-Marc Lacoste, Chief Executive Officer, who brings extensive experience in project development, capital markets and corporate governance within the junior mining sector.
O3 Mining combines technical expertise in geology, engineering and environmental management to advance its portfolio of gold assets. With an emphasis on systematic exploration and community engagement, the company seeks to unlock value through resource growth, de-risking of project economics and progression toward development decisions in Quebec’s favorable mining jurisdiction.
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