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. Ongoing 60,000m drill program targeting 30-100 million ounce potential.
NI 43-101 TECHNICAL REPORT (MAY 2020)
Inferred Resource: 7.56M oz @ 8,582 g/t Ag
TECHNICAL MILESTONES
60,000m Drilling
43,000m completed. Multiple new vein structures identified.
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. Re-2Ox testing underway.
Meters Drilled
Vein Structures
g/t Silver (Peak)
% Cobalt (Max)
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.
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 Nipissing diabase, dipping east from historic mines. Recent shallow intercept of 4,000+ g/t at 50m suggests multiple mineralized horizons.
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 Robinson Zone. Eight total structures identified. 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.
Rachidi, M. 2020, NI 43-101 Technical Report, effective May 28, 2020.
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.