MAYFAIR GOLD CORP.

Metallurgical Test Program

Fenn-Gib has been the subject of multiple metallurgical testing campaigns since 2011. Test work has focused on gold recovery and has included gravity concentration, whole-ore cyanide leaching, flotation, flotation-cyanidation, flotation-pressure oxidation, rock hardness and material characterization studies.

In late 2024, metallurgical testing commenced with the intention of improving the understanding of the mineralization response to potential plant flow sheets with the testing of grind size, rougher flotation and concentrate mass pull, flotation concentrate regrind sizing and cyanidation response for various plant feed gold grades, sulphide concentration, mineralogical content, rock hardness, at various depths, and lithologies. This phase of metallurgical testing is complete. Refer to the news release dated May 27, 2025 “Mayfair Provides Update on 2025 Metallurgical Test Results Supporting the Fenn-Gib Pre-feasibility Study” and the Technical Report titled, “Fenn-Gib Technical Report - Mineral Resource Estimate Update” (document dated October 10, 2025 with an effective date of September 3, 2024).

In summary, metallurgical testing of Fenn-Gib composite samples over a range in head grade from 0.2 to 19.1 g/t Au and 0.3 to 8.1% S2-resulted in the development of a hybrid process approach, which is applicable to all associated deposit lithologies and rock types.

Treatment of Fenn-Gib mineralization considers a P80 106 µm flotation feed size with an approximate 23% mass pull to a rougher concentrate. Subsequent regrinding of the concentrate to P80 10 to 13 µm is followed by cyanidation yielding an estimated overall 89.6% Au extraction at a 1.5 g/t Au feed grade.

Metallurgical test work and associated process criteria defined to date is representative and supports the associated Mineral Resource Estimate and the Mineral Reserve Estimate and is complete to support a Pre-Feasibility study (“PFS”). Future test work will focus on specific parameters required for process design and advanced engineering, along with additional variability test work to improve technical confidence and statistical accuracy of gold recovery estimates.

With this phase of metallurgical testing along with the past work, the Company has included the test results in the PFS and have defined metallurgical performance for the 4,800 tonne per day plant.