This report presents the Mineral Resource Estimate update for the Fenn-Gib Project in Ontario, Canada, including processing-related metallurgical testing findings and recovery estimates.
Report context
The Fenn-Gib Project is located in Ontario, Canada, and is the subject of a National Instrument 43-101 Technical Report prepared for Mayfair Gold Corp. The report, dated October 10, 2025, updates the Mineral Resource Estimate and includes detailed sections on mineral processing and metallurgical testing. The information presented here is derived exclusively from the technical report's processing-related sections, specifically Sections 1.5, 1.7, 13, and related content.
Processing route
Metallurgical testing overview
The metallurgical testing program for the Fenn-Gib Project was designed to characterize the processing behavior of the mineralization. Testing included composite sample selection, lithology assessment, rock hardness characterization, mineralogical analysis, and recovery estimation. The program incorporated both historical studies from 2015–2022 and new testwork conducted in 2023–2024.
Composite sample selection
Composite samples were selected to represent the range of mineralization within the deposit. Sample selection considered lithology and spatial distribution to ensure the composites were representative of the material expected to be processed. Details of the composite sample selection process are documented in the report, with the approach designed to support metallurgical variability assessment.
Lithology and mineralogy
The metallurgical testwork included assessment of the lithological characteristics of the composites and detailed mineralogical analysis. These studies were designed to identify the principal gold-bearing minerals and any potential processing challenges, such as refractory behavior or the presence of deleterious minerals.
Rock hardness characterization
Rock hardness testing was performed as part of the metallurgical program to support process design. The results of this testing provide data for comminution circuit design and are reported in the key parameters table.
Recovery estimates
Recovery estimates were developed from the metallurgical testwork results. These estimates are presented in the report and are incorporated into the processing assumptions for the project. The variability of recovery across the deposit was assessed as part of the metallurgical variability program.
Key reported parameters
| Parameter | Value | Basis |
|---|---|---|
| Recovery estimate | Reported in Section 13.4 | Based on metallurgical testwork |
| Rock hardness | Characterized | Testwork as per Section 13.3.4 |
| Deleterious elements | Assessed | Section 13.6 |
| Additional metallurgical testwork | Reported | Section 13.7 |
Project website: https://www.newswire.ca/news-releases/mayfair-submits-fenn-gib-gold-project-notice-of-project-status-873283507.html
*Note: Specific numerical values for recovery and hardness parameters are detailed in the report sections referenced above.*
Technical qualifications
The technical report includes several limitations and qualifications relevant to the processing information:
- The metallurgical testing program is described as having produced "findings" and "conclusions" that are reported in Sections 13.1 and 13.2 of the source report.
- The report distinguishes between previous metallurgical studies (2015–2022) and new testwork (2023–2024), with the latter described in Section 13.3.2.
- Recovery estimates are stated to be based on testwork, and metallurgical variability was assessed as part of the program.
- The report notes potential factors that may affect the Mineral Resource Estimate, including metallurgical factors, as detailed in Section 14.13.
These qualifications show the level of confidence in the processing data and the need to consider the results in the context of the full technical report.
—
Source: Fenn-Gib Project, Ontario, Canada, National Instrument 43-101 Technical Report,Mineral Resource Estimate Update, October 10, 2025, Sections 1.5, 1.7, 13, and 14.13.
