Announcement • Sep 08

Mayfair Gold Advances Exploration Targets and Project Geology At Fenn-Gib

Mayfair Gold Corp. reported on its summer exploration program progress and mine geology advancement to further its operational readiness program. 2026 Exploration Program: The 2026 exploration program focused on advancing the geological understanding of the North and South blocks through systematic geological mapping, prospecting, sampling, and compilation of historical data. Over 95% of known outcrops across both blocks were reviewed, mapped and selectively sampled, providing extensive coverage of the property and adding significantly to the geological dataset available for ongoing interpretation and targeting. A total of 127 grab samples were collected across the North and South blocks, including selected samples for gold assay and multi-element geochemical analysis. Geological and structural observations recorded during fieldwork focused on documenting structural features, lithology, alteration, and mineralization. The results of this work are being integrated with existing historical datasets to build a more complete understanding of the property. A structural targeting program is also underway and has identified a number of areas for further evaluation. These targets are being integrated with the results of the summer mapping and sampling program to help refine areas for potential follow-up geological, geochemical, and geophysical work. The Company is currently finalizing plans for its fall and winter exploration programs. Infrastructure Condemnation Drilling Program: Mayfair has completed its 2026 condemnation drilling program, comprising 23 drill holes totalling 6,184 metres, including two redrills. The program was designed to test the proposed locations of key project infrastructure identified in the 2026 Pre-Feasibility Study Technical Report. The drilling results confirm that the tested locations remain suitable for the planned infrastructure, and no changes to the current site layout are required. Mine Geology and Geochemical Modelling: Efforts are underway to build a comprehensive 3D model integrating geology and a multi-element database. To date, over 900 inductively coupled plasma mass spectrometry assays (ICP-MS) have been taken in and around the main Fenn-Gib deposit. Mayfair is continuing to expand the database and model key elements to strengthen the geo-metallurgy model. The final product will also serve in vectoring pathfinder elements to support exploration efforts on the property scale. Acid-based accounting assays (ABA) are also being included to further support and strengthen the various environmental baseline studies. Finally, the previously reported grade control program yielded favorable results (see news release dated June 18, 2026). Mayfair is currently considering options to capitalise on those results and potentially do targeted infill drilling to pursue that program. Quality Assurance and Quality Control: Mayfair Gold maintains a Quality Assurance/Quality Control (QA/QC) program aligned with NI 43-101 requirements and industry best practices. NQ size surface drilling was carried out by Black Diamond Drilling of Matheson, Ontario, and by Wiijiiwaagan Drilling Limited Partnerships of Haileybury, Ontario, under the supervision of Mayfair Gold's exploration team. The drill program includes detailed geological logging and systematic sampling of drill core at Mayfair's secure facility in Matheson, Ontario. Drill core selected for analysis was cut longitudinally using a diamond-blade saw. One half of the core was retained in the core box for reference, and the other half was bagged, sealed, and prepared for shipment. Analytical work was completed by Swastika Laboratories Ltd. in Swastika, Ontario. Swastika Laboratories is independent of Mayfair Gold and accredited by the Canadian Association for Laboratory Accreditation Inc. (CALA) and meets the ISO/IEC 17025 standards for gold analysis by fire assay with gravimetric finish and fire assay with flame atomic absorption spectroscopy (FAAS) finish. Samples were delivered directly to Swastika Laboratories by Mayfair personnel. Samples are crushed to minimum 80% passing 1,700 µm. Samples are then split to obtain a 300–500 g sample using a rotary divider. 300–500 g samples are pulverized to minimum 85% passing 74 µm. Gold assays were completed using a 30-gram fire assay with FAAS finish. Samples returning gold grades greater than 10 g/t were re-assayed using a 30-gram fire assay with gravimetric finish. As part of Mayfair's QA/QC protocol, one certified reference material (CRM), one coarse blank, and one coarse duplicate sample were inserted into the sequence of every 25 samples. Routine third-party check assays are also performed. True thickness for condemnation drilling is unknown.

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