visible silver in the drill core from the Big Silver Vein (hole CS-20-39 with assays up to 89,853 g/t Ag (2,621 oz/ton) over a 0.3m within 60m

Castle East Project

Grassroots discovery

Massive native silver grades up to 89,853 g/t (2,621 oz/ton) intersected during surface drilling at the Castle East Robinson Zone less than 2 km east of the Castle Mine shafts.
The Company published the region’s first 43-101 resource estimate with a total of 7.56 million ounces of silver in inferred resources.

Resource Estimate

Most recently updated 43-101 from May, 2021.



Surface drilling
Completed 34,832.1m of surface exploration diamond drilling
Drill Results
7 new structures with grades up to 30,416.91 g/t silver and 2.24% cobalt
Environmental Study
Baseline study data collection began in February 2021
Ramp Permits
Started the process in the fall of 2021 for the planned ramp
AI-based Drill targets
Engaged GoldSpot to aid our technical staff
Downhole Geophysics
To assist with geologic interpretation

Meters Drilling


g/t Silver

% Cobalt


Finish Drill Program
Remainder of 60,000m with resource estimate update in H2 2022
Sample Tailings
Stamp mill tailings from Castle Mine, test with gravity pilot plant
AI Targets
Review with Technical team and plan further exploration
Graphical illustration of the planned ramp to access the high-grade silver discoveries

The Ramp

Full scope of the Discovery

The planned ramp will extend down to the 400m level to access the high-grade silver material for bulk samples and to carry out advanced exploration drilling from underground locations.
Currently, Environmental tests are underway to obtain necessary permits.
History shows that these richly mineralized shoots are never found in isolation. In this case, modern technology has opened a whole new domain of exploration.

Doug Robinson

P. Eng.
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Identified Silver

The discoveries are primarily in the Nipissing Diabase, although drilling has also identified silver in the Archean Volcanic above the Nipissing Diabase. Below is a cross section representation of veins that are expected to be included in the upcoming resource update.
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The Castle East high-grade silver project is located in the Gowganda camp. In the 1900s, the Castle, Capitol and O’Brien mines were the most prolific in the area, accounting for about three-quarters of the total 80 million ounces silver mined.
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The Robinson Discovery Zone vein shoot has been found 1.9 km east of Castle Shaft #3, and just below the middle of the Nipissing diabase at under-explored Castle East.
The latest drill results support our view that Castle East could progress into being a full-fledged mine, producing silver and other metal byproducts such as cobalt and nickel.

Matt Halliday

President, P. Geo.

Mineral Resource Estimate (Castle East)

Cut off grade of 258 AgEq g/t
Note that mineral resources that are not mineral reserves do not have demonstrated economic viability. Please refer to Canada Silver Cobalt Works Press Release May 28, 2020, for the resource estimate.
Report reference: Rachidi, M. 2020, NI 43-101 Technical Report Mineral Resource Estimate for Castle East, Robinson Zone, Ontario, Canada, with an effective date of May 28, 2020, and a signature date of July 13, 2020.
Inferred Mineral ResourcesAg (g/t)Co (g/t)Cu (g/t)Ni (g/t)AgEq (g/t)TonnesAg (oz.)AgEq (oz.)
Zone 1A7,9609463497908,0428,1002,073,0002,094,000
Zone 1B8,8432,3083253368,99819,3005,487,2005,583,200
Zone 2A385,6732,1014531185,5006,80075,300
Total Inferred Mineral Resources7,1492,5376284677,32532,9007,567,0007,752,000
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Drill core

High-grade silver vein at Castle East initially discovered at a depth of 400m during diamond drilling from the surface. Additional discoveries in first of drill core for CS-19-08-W01 (50,583 g/t Ag over 0.6m at 427m vertical depth) and then CW19-08-W-02 (70,380 g/t Ag over 0.3m at 418m vertical depth)
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Drill core

Very high-grade drill core included in the initial resource grade estimate of 8,582 g/t Ag in 27,500 tonnes of material starting from vertical depth of approximately 400 meters. Several new high-grade veins have been discovered in the vicinity from an ongoing 60,000m drill program expected to be completed in Q2 2022.
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