McFarlane Initiates Environmental Baseline Study Work for Juby

Press Release

A Vital Step In Advancing Permitting For Ore Extraction

Toronto, Canada – December 1, 2025 – McFarlane Lake Mining Limited (“McFarlane” or the “Company”) (CSE: MLM, OTC: MLMLF) a leading Canadian gold exploration company focused on advancing its flagship Juby Gold Project, located  approximately 15 kilometers west from Gowganda, Ontario and approximately 90 kilometers west from Temiskaming Shores, Ontario is pleased to announce it has engaged Pinchin Ltd. (“Pinchin”), a leading environmental consulting firm,  to complete a comprehensive suite of baseline environmental studies at the Juby Gold Project.

Mark Trevisiol, Chief Executive Officer and President of McFarlane, commented, “Launching these vital environmental studies is an important step forward for the Juby Gold Project. Pinchin’s work will give us a detailed understanding of current site conditions and provide the data we need to advance engineering, permitting for ore extraction, and long-term development planning. Establishing a strong environmental baseline now helps ensure we move the project forward responsibly while continuing to demonstrate the quality and potential scale of this asset. We will work transparently with First Nations and all community members to achieve this.”

Pinchin’s engagement will cover crucial baseline environmental studies designed to support future permitting and development planning for the Juby Gold Project. Field programs will document existing vegetation communities, wetlands, aquatic habitats, hydrogeology and hydrology, and wildlife use across the project area. This information will help McFarlane Lake identify potential environmental impacts early, design responsibly, and ensure the project advances in alignment with regulatory expectations and best practices for modern mine development.

The scope of work includes a Hydrogeological and Hydrological Baseline Study to characterize groundwater flow systems, aquifer conditions, and surface water–groundwater interactions as required under the Mine Rehabilitation Code of Ontario. Pinchin will also complete geochemical testing to evaluate the potential for acid rock drainage and metal leaching from mine rock, tailings, and overburden materials. In addition, a Terrestrial Baseline Program will assess vegetation communities, wildlife habitat, and potential species-at-risk occurrences, while an Aquatic Baseline Program will document surface water, wetland, and riparian conditions within and downstream of the project footprint. Together, these studies will form the essential environmental foundation required for responsible advancement of the Juby Project.

About McFarlane Lake Mining Limited

McFarlane Lake Mining Limited is a Canadian gold exploration company focused on advancing its flagship Juby Gold Project, located near Gowganda, Ontario, within the established Abitibi Greenstone Belt. The Juby Project hosts a current (effective September 29, 2025) NI 43-101 compliant Mineral Resource Estimate (“MRE”) of 1.01 million ounces of gold in the Indicated category at an average grade of 0.98 g/t gold (31.74 million tonnes) and an additional 3.17 million ounces of gold in the Inferred category at an average grade of 0.89 g/t gold (109.48 million tonnes). The estimate was calculated using a long-term gold price of US$2,500 per ounce, applying cut-off grades of 0.25 g/t gold for open pit and 1.85 g/t gold for underground resources.

A sensitivity analysis completed at a higher gold price of US$3,750 per ounce resulted in an Indicated Mineral Resource of 1.20 million ounces grading 0.94 g/t gold (39.51 million tonnes) and an Inferred Mineral Resource of 4.23 million ounces grading 0.85 g/t gold (154.50 million tonnes) applying cut-off grades of 0.25 g/t gold for open pit and 1.15 g/t gold for underground resources.

The independent MRE was prepared by BBA E&C Inc. in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects. The full technical report supporting the resource estimate was filed on SEDAR+ (www.sedarplus.com) on November 21, 2025, and is available on the Company’s website using https://mcfarlanelakemining.com/tech-report/.

McFarlane is actively planning an exploration drilling program and additional technical studies at the Juby Gold Project to further evaluate and advance this large-scale gold system.

In addition to the Juby Gold Project, McFarlane holds a portfolio of 100%-owned gold assets in Ontario, including the past-producing McMillan Gold Mine and Mongowin properties located approximately 70 km west of Sudbury and the Michaud/Munro properties located 115 km east of Timmins. McFarlane is a reporting issuer in Ontario, British Columbia, and Alberta.

Readers are cautioned to refer to the “Cautionary Statement on Mineral Resources” and all other disclaimers included in this news release for important information regarding the limitations and verification status of the data presented above and elsewhere herein.

To learn more, visit: https://mcfarlanelakemining.com/.

Additional information on McFarlane can be found by reviewing its profile on SEDAR+ at www.sedarplus.com.

Qualified Person

The scientific and technical information disclosed in this news release was reviewed and approved by Mark Trevisiol, P.Eng., an officer of McFarlane and a Qualified Person under National Instrument 43-101.

Advisors

Wildeboer Dellelce LLP is acting as legal counsel for McFarlane.

Further Information

For further information regarding McFarlane, please contact:

Mark Trevisiol,
Chief Executive Officer, President and Director
McFarlane Lake Mining Limited
(705) 665-5087
mtrevisiol@mcfarlanelakemining.com

Kaitlin Taylor,

Investor Relations

McFarlane Lake Mining Limited

(778) 887-6861

investors@mcfarlanelakemining.com

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