O3 Mining Inc. (TSX-V:OIII) is pleased to announce that, further to its announcement dated September 4, 2019, it has completed a “bought deal” brokered private placement of 2,400,000 common shares of the Corporation that will qualify as “flow-through shares” (within the meaning of subsection 66(15) of the Income Tax Act (Canada) and section 359.1 of the Taxation Act (Québec)) at a price of C$4.20 per Flow-Through Share for aggregate gross proceeds of approximately C$10,080,000.

The Offering was led by Canaccord Genuity Corp. on behalf of a syndicate of underwriters that included National Bank Financial Inc., BMO Nesbitt Burns Inc., CIBC World Markets Inc., Cormark Securities Inc., Desjardins Securities Inc., Echelon Wealth Partners Inc., Haywood Securities Inc., and Sprott Capital Partners L.P. (together, the “Underwriters“). In consideration for their services, the Corporation paid the Underwriters a cash commission equal to 5.0% of the gross proceeds of the Offering.

The gross proceeds from the sale of Flow-Through Shares will be used by the Corporation to incur “Canadian exploration expenses” that qualify as “flow-through mining expenditures” (as both terms are defined in the Income Tax Act (Canada)) related to the Corporation’s projects in Québec. The Qualifying Expenditures will be renounced in favour of the subscribers of Flow-Through Shares with an effective date no later than December 31, 2019 and in the aggregate amount of not less than the total amount of the gross proceeds raised from the issuance of Flow-Through Shares.

All securities issued under the Offering will be subject to a hold period expiring four months and one day which will expire January 26, 2019. The Offering is subject to final acceptance of the TSX Venture Exchange. The securities offered have not been registered under the U.S. Securities Act of 1933, as amended, and may not be offered or sold in the

United States absent registration or an applicable exemption from the registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of the securities in any State in which such offer, solicitation or sale would be unlawful.

About O3 Mining Inc.

O3 Mining’s mission is to become a premier gold exploration company in Canada and an emerging consolidator of exploration properties in prospective gold camps in Canada – focused on projects in Ontario and Québec – with a goal of becoming a multi-million ounce, high-growth company.

O3 Mining is well-capitalized and holds a 100% interest in the Marban Block Project and the Garrison Project. The Marban Block Project is located in the heart of Québec’s prolific Abitibi gold mining district and comprised of four contiguous claim groups in the Malartic mining camp – Norlartic, First Canadian, Marban and Gold Hawk – and currently consists of 30 mining claims and three mining concessions that cover 1,023 hectares. The Garrison Project is located in the Larder Lake Mining Division in Northern Ontario and comprised of three main deposits – the Garrcon, Jonpol and 903 deposits – as well as the past-producing Buffonta mine and the Gold Pike mine property.