1. Definition drilling along an initial 1.3 km of modelled strike.
2. Large step-outs to the south where MT geophysics suggest upwards of 5 km of potential strike length.
3. Targeting increasing high-grade hypogene enrichment.

• Drill hole HER-25-02, the first completed drill hole of 2025 showed strong evidence of thicker hypogene enrichment.

• • A 220m step-out NE of HER-24-12, drill hole HER-25-02 intersected high-grade mineralization grading 1.5% Cu and 8.9 g/t Ag over 81m, within a larger interval of 127m of 1.1% Cu and 7.0 g/t Ag, all within a broad 346m intercept of 0.66% Cu, 3.2 g/t Ag, and 78 ppm Mo. (see full news release here)

• Definition drilling from drill holes HER-25-05 and HER-25-03 added near-surface mineralization (~110m true depth) to the hanging zone. (see full news release here)
  • Drill hole HER-25-05 intersected long intervals grading 0.6% Cu and 1.8 g/t Ag over 273m, within 379m of 0.5% Cu, 75 ppm Mo, and 1.8 g/t Ag, which also included 35m of 1.01% Cu and 6.2 g/t Ag.

• The 2025 drilling campaign is expected to continue into early December, weather permitting, with systematic drilling occurring across 200m-spaced fences as the Company works toward initiating the first maiden resource estimate for Leviathan.

• Expanded Coverage: Applying a proven discovery method at Leviathan to a district-scale (120 km²) land package.
• Superior Depth: MT can reliably model conductivity, Leviathan’s strongest geophysical property, to depths of up to 6 km.
• Phase I results reveal a remarkable correlation with Leviathan’s southeast dipping copper mineralization.

• The new 2025 geological model reveals southeast dipping geometry of concealed porphyry system for the first time
• A walkthrough video of the Company’s initial 3D model published in April 2025 is available here
• New northwest-oriented drilling orientation, perpendicular to the system, has increased the hit rate of strong porphyry mineralization

The summer 2024 Phase III program consisted of over 12,000m of drilling, starting west of the 2023 discovery area, and testing new magnetic anomalies and conductivity and chargeability anomalies identified by the 2023 deep-seeking 3D IP survey.

• The phase III drill program focused on multiple targets focusing on the Leviathan porphyry coper system, including:
  • Large step-out drilling defined a 1.2km x 1.6km mineralized zone with potential for multiple porphyry centers
  • Shallow Porphyry Mineralization to the Southeast: Recent drilling has intersected early biotite alteration with mineralization beginning as shallow as 72 meters true depth, indicating potential for near-surface porphyry mineralization.
  • Grade Creek Zone Increasing Grades to the North with first recorded increase in mineralization at depth, outside of the late Porphyry, where a large untested chargeability and magnetic anomaly presents a compelling target for a vertically extensive early porphyry center.
  • New Hydrothermal Breccia: The discovery of a magmatic-hydrothermal breccia pipe represents a new target type with vertically extensive potential.
• Multiple untested chargeability targets remain with only 20% of the target area tested to date with the system remaining open in all directions – 6 multi-km scale targets identified for further drilling.
• Metallurgical Testing: Initial metallurgical testing confirmed that the mineralized material from the Leviathan porphyry copper system is amenable to conventional processing techniques, with copper recoveries exceeding ± 87% using standard flotation methods, with ongoing locked cycle testing now projected to recover ± 90%. Additionally, A straightforward two-step leaching process on the near-surface silver delivered impressive recoveries of 86% for oxide mineralization and 82% for sulfide mineralization.

The 2023 property-wide deep-seeking IP survey was designed to explore the new Leviathan Porphyry at depth. The new survey expanded on the initial chargeability anomaly first tested last year and revealed trends that are comparable with known porphyry copper systems.

The deep-seeking 3D IP, direct current resistivity and drone magnetic geophysics over the area to be drill tested in 2024, revealed multiple prospective targets, coincident with the direction of increasing copper porphyry grades seen in the initial 2023 deep discovery holes drilled at the Leviathan Porphyry.

• Conductivity anomaly below historical mining at the Belmont Zone
• Kilometers of prospective chargeability from Belmont to Grade Creek
• Moderate chargeability anomaly near surface at the Big Cut Skarn provides an additional satellite drill target
• 3D magnetic inversion reveals magnetic highs potentially associated with a potassic core.
• Soil sampling, mapping, and prospecting planned to cover extensions of newly identified geophysical targets

The summer 2023 Phase II drill program consisted of step-out holes designed to test for extensions of historical mineralization, verify previous historical drilling and test a series of new targets generated by greenfields exploration.

The 6,000 m program focused on the following targets:

• Hercules Adit and Frogpond Zones: Step-out holes aiming to extend mineralization, as well as infill and further verify historical drilling results.
• Hercules Rhyolite: Robust silver targets identified through surface mapping, geophysics and geochemistry, including at the Hinge, Haystack and Belmont Zones.
• New porphyry copper-silver (+/- gold) target: Interpreted as the center of a large zoned system and feeder for the surrounding silver (+/-lead-zinc) hosted in the Hercules Rhyolite.
• Large-scale untested chargeability anomaly at depth, potentially representing a large body of strong sulfide mineralization.

Five deep drill holes encountered strong phyllic alteration, which is typical of the margins of a porphyry system, over approximately 450m x 500m, called the Leviathan Porphyry. HER-23-05, the first hole to test a large-scale (>1.8km) blind chargeability anomaly, intersected 185.29m of 0.84% Cu and 111 ppm Mo from 246m to 431.2m, including 45.33m of 1.94% Cu. 

Additional step-out holes drilled at various orientations to the southeast of HER-23-05, where chargeability data was currently available, intersected similar alteration, veining and copper mineralization over variable lengths. Many directions remain to be tested, and the potassic center, which often carries the highest grades within porphyry systems, remains to be found. 

The 2022 3D IP survey over the Hercules Adit, Frogpond and Belmont Zones, identified a large untested chargeability anomaly at depth. The results demonstrated the excellent exploration potential at Hercules and contributed to 2023 drilling.

• Strong chargeability values (>25ms), below historical drilling, and over a continuous strike length of 1.8 kilometers
• Anomaly is coincident with the untested base of the Hercules Rhyolite where surface mapping indicates the strongest silver mineralization to occur (See Oct 18 NR)
• Lower portion of anomaly lies down dip of the copper mineralization hosted within the underlying Seven Devils volcanics
• Anomaly remains open up-dip to the southeast

The November 2022 Phase I drill program was designed to test and verify historical drilling assays as well as gain the geological and geotechnical information needed to support a Phase II drilling campaign in early spring of 2023. 

The program consisted of infill and step-out holes at the Frogpond and Hercules Adit Zones with additional step-out holes to test open zones with little to no prior drilling. 

A total of 1,995 feet in 9 drill holes was completed, with several holes bottoming in mineralization, and high-priority areas were tested within the Frogpond and Hercules Adit Zones for potential inclusion in future resource estimates. (See Feb 28 NR).

Highlights of the program include: 

• Strong grade over multiple significant intervals, including drill hole HER-22-01, the first hole of the program, which intercepted 38 meters of 353 g/t Ag, 0.64% Pb, 2.28% Zn and 0.16% Cu (487 g/t AgEq), beginning at a shallow depth of 26 m depth in first drill hole, HER-22-01.
• HER-22-01 included a higher-grade intercept of 4.57 m grading 791 g/t Ag, 1.25% Pb, 4.06% Zn and 0.18% Cu (1,021 g/t AgEq) starting at 29 m.
• HER-22-07 intersected 44.2 m grading 224 g/t Ag, 0.32% Pb, 0.38% Zn and 0.09% Cu (258 g/t AgEq) starting at 1.5 m.
• Drilling grades significantly exceed grades sampled at surface, supporting the concept of potential supergene enrichment of mineralization below surface.
• Confirmed the presence of a high-grade shoot (the P-19 Shoot) at the east end of the Frogpond Zone; open at depth to the east.
• Confirmed the presence of shallow, high-grade mineralization at Frogpond and Hercules Adit Zones, with additional follow-up planned for Phase II.