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Miravalles Gold Corp. has entered into a definitive agreement to acquire a 100% interest in the Fairfield Gold Project, a 1,012-hectare gold-silver exploration property in Nayarit, Mexico. The project is centered on a series of historically developed high-grade vein structures. Historical work includes ASARCO underground development, Mexican Geological Survey drilling, and multiple historical technical studies.
Fairfield hosts multiple gold-silver vein structures with the principal zones including Miravalles, San Francisco, Tres Estrella, and Constancia. Historical development and dump material indicate significant past work, and 2026 field sampling confirmed gold-silver mineralization across several targets.
High-grade vein target locations — Miravalles, Coronillas, San Francisco, Constancia, and Tres Estrella
*2026 sample results are grab samples, which by their very nature are select samples and are not necessarily indicative of similar mineralization on the Fairfield property.
Fairfield has a documented history of exploration and development dating back to the mid-17th century, including ASARCO underground development in the early 20th century and modern Mexican Geological Survey drilling in 2005–2006.
Miravalles Vein — Reported Historical Estimate
The Mexican Geological Survey drilled five diamond drill holes totalling 634.7 m in 2005–2006. DDH-3 intersected the Miravalles vein below historical workings at a shallow angle to core axis. True thickness is materially narrower than core length for the reported intercepts.
DDH-3 Highlighted Intervals — Miravalles Vein
| Interval (m) | Core Length | True Thickness | Gold (g/t) | Silver (g/t) |
|---|---|---|---|---|
| 178.1 | — | 0.55 m | 12.15 | 443 |
| 183.1 | — | 3.4 m | 23.49 | 64.13 |
| 182.55–188.60 | 6.05 m | 2.0 m | 27.5 | 10.7 |
| 198.60–201.20 | 2.60 m | 0.9 m | 5.8 | 1.4 |
| 196–201 | — | — | 4.71 | 16.8 |
DDH-3 intersected the Miravalles vein at approximately 20 degrees to core axis. True thickness should be used where available. Core length is not true width; reported true thickness values are materially narrower than core intercept lengths.
During the March 8, 2026, property visit, the technical team visited Tres Estrella, Constancia, San Francisco, and Miravalles, and reviewed SGM DDH-3 drill core. Sampling returned gold values across all sampled vein structures.
| Sample ID / Location | g/t Gold | g/t Silver |
|---|---|---|
| 2026-03-08-001 · Tres Estrella Dump | 4.52 | 13.1 |
| 2026-03-08-002 · Constancia Dump | 0.02 | 2.1 |
| 2026-03-08-003 · San Francisco Dump | 7.93 | 66.8 |
| 2026-03-08-004 · Miravalles Adit | 1.18 | 4.6 |
| 2026-03-08-005 · Miravalles Dump | 7.51 | 7.7 |
| 2026-03-08-006 · Miravalles Dump | 3.77 | 7.0 |
| Constancia Dump | 4.66 | 99.6 |
*2026 sample results are grab samples, which by their very nature are select samples and are not necessarily indicative of similar mineralization on the Fairfield property.
Beyond the high-grade gold-silver vein system, Fairfield has porphyry copper-gold exploration potential supported by intrusive geology, alteration, geophysical anomalies, and stockwork veining observations. Porphyry targets have not been previously drill-tested.
Porphyry copper-gold targets — La Mano and Diatreme
Decades of historical work have defined the targets — a modern, systematic exploration program will test them with current tools, technology, and technical standards.
Review and compile historical reports, maps, drilling, and sampling data into a current technical database.
Complete drone LiDar and magnetics to extend strike projections and locate new veins/workings. Systematically sample veins along strike to determine drill targets within veins.
Drone magnetics and IP/resistivity surveys to define subsurface porphyry target geometries prior to drilling.
Diamond drilling on priority vein and porphyry targets, focusing on both confirmation and JORC/NI 43-101 development.
Tracing the vein structure in the Tres Estrella adit
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