Radisson Reports Metallurgical Study Results for O'Brien Gold Project in Quebec

Radisson Mining Resources has released results from a recent metallurgical study at its 100%-owned O'Brien Gold Project in the Abitibi region of Quebec. The study was conducted alongside a milling assessment under a Memorandum of Understanding (MOU) with IAMGOLD Corporation to evaluate the feasibility of processing O'Brien ore at the nearby Doyon gold mill, part of IAMGOLD's Doyon-Westwood mine complex. The mill is located 21 kilometers west of O'Brien, with direct access via Trans-Canada Highway 117.

Gold recoveries ranging from 86% to 96% were achieved through various flow sheet options, all of which align with the Doyon mill with minimal or modest capital adjustments. The metallurgical program was undertaken at SGS Canada Inc.'s Lakefield, Ontario facilities under the supervision of Ausenco Engineering Canada ULC. Key highlights include:

• 86% gold recovery using a simple Gravity-Leach flow sheet.

• 90% gold recovery using a Gravity-Flotation-Regrind-Leach flow sheet.

• 94% to 96% recovery through a Gravity-Flotation-Concentrate Sale process, factoring in payability between 90% and 95%.

• Average arsenic values of 0.4% to 0.5% in whole rock and 4.6% in flotation concentrate, within the limits of comparable high-grade gold projects in Quebec’s Abitibi region.

Strong Metallurgical Performance

"We are very happy with the results of this metallurgical study at O'Brien, undertaken within the context of our milling assessment MOU with IAMGOLD," said CEO Matt Manson. "This is the first metallurgical program at O'Brien based on a comprehensive suite of representative samples and with a specific mill in mind. We see multiple flow sheet options for O'Brien, each of which gives gold recoveries above the 85% assumed in our March 2023 Mineral Resource Estimate."

Manson added, "We estimate 86% recovery with only minimal adjustment to the existing Doyon mill configuration at very low cost. We see recoveries of 90% with the re-introduction of a flotation circuit and on-site leaching, and we see a very attractive outcome of up to 96% should the sale of a flotation concentrate be arranged."

The results demonstrate strong optionality for O'Brien, including the potential for offsite tailings deposition following leach or the sale of a flotation concentrate. The study provides a significant milestone in determining the processing, environmental, and economic potential of the high-grade O'Brien gold mineralization.

Next Steps: Preliminary Economic Assessment (PEA)

Following the study, Radisson plans to complete a Preliminary Economic Assessment (PEA) for O'Brien, assuming offsite milling and utilizing the 2023 Mineral Resource Estimate for mine planning. To advance the project, the company has retained:

• Ausenco for processing design, infrastructure, and financial modeling.

• InnovExplo (part of Norda-Stelo Inc.) for mine design and scheduling.

• BBA Inc. for water management, surface facilities, and environmental permitting review.

Comprehensive Testing Program

The metallurgical study was based on 35 mineralized core samples, with gold grades ranging from 0.8 g/t to 49.1 g/t. These samples were crushed, rotary split, and grouped into four composite samples representing the primary Piché Group lithologies hosting O'Brien’s vein mineralization. A fifth master composite was also created to reflect the lithological proportions in the 2023 O'Brien Mineral Resource Estimate.

Test work at SGS-Lakefield included gravity concentration, whole rock cyanide leaching, flotation, regrinding, and flotation concentrate and tails cyanide leaching. Results from these tests have provided critical insights into O'Brien’s metallurgical behavior and the optimal processing approach.

With strong metallurgical recoveries, proximity to existing milling infrastructure, and a clear path to a PEA, Radisson continues to advance the O'Brien Gold Project toward potential development.

Tags: Quebec / Exploration / Gold / All Articles