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O3 Mining reports 96% gold recoveries at Marban Pit in Val D'Or

Feb 9, 2022

"We are very pleased the test work has confirmed excellent gold recoveries at the Marban project," O3 Mining's President and Chief Executive Officer, Mr. Jose Vizquerra said.

"Our test work supports and improves PEA assumptions of quick leach times, strong recoveries, and a simple flowsheet comparable to peers in the Abitibi-Témiscamingue region. These results provide an excellent foundation for the project and represent a significant milestone for the company as the Marban project moves towards the completion of the PFS. Additional metallurgical work is planned that will feed into in the final stages of the economic study."

O3 Mining Inc. is reporting the results of gold recovery test work conducted on drill core samples from its 100 percent owned Marban Project in Val-d'Or. The results were produced from the recent metallurgical testing program completed by Base Metallurgical Laboratories in Kamloops, British Columbia, under the overall supervision of Ausenco Engineering Canada Inc. Additionally, the Corporation has appointed Ausenco to lead the Pre-Feasibility Study for the Marban project, which O3 Mining intends to have completed by Q3 2022.

Highlights From the Cyanidation Test Work

  • Overall gold extraction at Marban Pit South of 96.7%; Marban Pit North of 95.8%; Norlartic Pit of 91.2%; versus Preliminary Economic Assessment ("PEA") overall gold extraction of 93.7% 
  • Enhanced Gravity Recovery Gold testing resulted in 61%-65% recovery of gold 
  • Recovery of gold achieved after 24 hours of leach time; versus PEA 28 hours 
  • Average Bond ball mill work index at 13.2 kWh/t.

The metallurgical gold recovery test-work was conducted to assess the potential gold recoveries and optimum process flow sheet for the Marban Project. Testing started in late 2021 on composite and variability samples from the Marban and Norlartic pits and variability samples from North Zone, Norlartic-Kierens and Golden Bridge. The program included comminution testing, grind optimization, gravity concentration, and leach testing. Cyanide destruction and solid liquid separation testing are still ongoing and will be completed in Q1 2022.

Gold Recovery Test Work Results Summary 
The program evaluated 24 discrete composite samples ("composite" or "composites") representing 375 kilograms of material from across the four deposits. Each composite consisted of multiple samples collected from diamond drill core and coarse rejects. Primary composites were selected for the Marban (two samples) and Norlartic pits to reflect grade, spatial and lithological distributions. The primary pit composites were designed to have average grades reflecting the PEA average pit grades. Variability samples were selected to reflect the grade ranges present and other lithological units.


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