CASTLE EAST DISCOVERY
World's Highest Grade Silver Resource
89,853 g/t silver over 0.3m ranks among the richest silver intercepts ever drilled. Initial resource of 7.56 million ounces at 8,582 g/t established from two vein sections. December 2025 independent NI 43-101 technical report by Ronacher McKenzie Geoscience consolidates the 2011–2023 drill campaign and recommends further work to expand the mineralized footprint.
INDEPENDENT NI 43-101 TECHNICAL REPORT (DECEMBER 2025)
Castle Silver Property — Ronacher McKenzie Geoscience
TECHNICAL MILESTONES
Multi-Year Drill Campaign
Systematic drilling defined the Robinson Zone and identified additional vein structures along strike.
Bonanza Grades
89,853 g/t, 70,380 g/t, 50,583 g/t silver. 2.24% cobalt intercepts.
Environmental Baseline
Multi-year data collection complete for permitting.
Ramp Engineering
Design to 400m level complete. Awaiting updated resource.
Geological Modeling
3D vein model with EarthLabs AI targeting.
Metallurgical Testing
Gravity recovery validated at TTL. Advanced hydrometallurgical testing underway.
Meters Drilled
Vein Structures
g/t Silver (Peak)
g/t Silver (Resource Avg)
DEVELOPMENT PLANNING
Underground Access to 400m Level
Planned ramp provides platform for resource expansion drilling and bulk sampling. Engineering complete. Environmental studies submitted. Construction pending resource update and project financing.
PROPERTY SETTING
Castle East Discovery in the Gowganda silver camp
DISCOVERY CONTEXT
First major discovery in camp since 1970s
Located 2km east of Castle Mine in unexplored gap. Historic producers Castle, Capitol, O'Brien combined for 80 million ounces from this structural trend.
GEOLOGICAL MODEL
Multiple high-grade panels at 400m depth
Mineralization occurs mid-level in the Nipissing diabase along its contact with overlying Huronian metasediments and underlying Archean volcanics, dipping east from the historic mines. A shallow intercept of 4,000+ g/t at 50m points to multiple mineralized horizons. The December 2025 NI 43-101 technical report integrates magnetic, DCIP and magnetotelluric surveys with 3D modelling to refine vein orientations, lithological domains and structural controls across the property.
PROPERTY MAPS & SECTIONS
Robinson Zone in context
Reproduced from the December 2025 independent NI 43-101 technical report by Ronacher McKenzie Geoscience, these figures place the Robinson Zone discovery and adjacent target areas within the Castle East property's historic workings and Nipissing diabase host stratigraphy.
Figures prepared by G. Vernoux, P.Geo., supervised by M. Bouchard, P.Geo. (May 2026).
The vein structures at Castle East show remarkable continuity. We're seeing the same high grades over significant distances, which is unusual for the camp and suggests a major mineralizing event.
Matt Halliday
TECHNICAL ADVISOR, P. GEO.
Resource Expansion Potential
Current resource from only two vein sections (1A and 1B) of the Robinson Zone. 29 total vein structures identified across the property. 2km strike length between Castle East and Castle Mine remains largely untested.
Polymetallic Credits
Gold values up to 22 g/t intersected in both diabase and overlying Archean rocks. Cobalt grades to 2.24%. Nickel and copper provide additional credits.
Resource Parameters
258 g/t AgEq CUTOFF (3% NSR)
Mineral resources are not mineral reserves. Economic viability not demonstrated.
Resource basis: Rachidi, M. 2020, NI 43-101 Technical Report, effective May 28, 2020. Most recent independent disclosure: Enright & Ronacher, Ronacher McKenzie Geoscience Inc., effective December 3, 2025.
Discovery Hole CS-19-08
Initial discovery at 427m vertical depth: 50,583 g/t Ag over 0.6m. Follow-up wedge holes confirmed continuity with 70,380 g/t and record 89,853 g/t intercepts.
Resource Definition Drilling
Systematic 25-50m spacing established 7.56M oz in 27,400 tonnes. Average grade of 8,582 g/t (250 oz/ton) ranks among world's highest silver resources.