Duncan Lake Zinc Project - Rokmaster Resources

Overview

The Duncan Lake Zinc Project is a 100%-owned, road-accessible, fully permitted zinc, lead, and silver project located in southeastern BC. Positioned within the Central Kootenay Arc, a highly prospective metallogenic belt with numerous mines and mineral occurrences, the project benefits from a geological setting favorable for multiple styles of zinc-lead-silver mineralization, including carbonate-hosted massive sulphide similar to Irish-type systems.

Duncan Lake comprises 37 contiguous mineral claims covering 6,017 hectares along the strike extension of Teck Resources’ historic Duncan Mine and hosts five defined zones: North Mine, No. 1, No. 2, No. 3, and Mag. The historic Duncan Mine, located between the North Mine area and the No. 1 to No. 3 zones, underscores the project’s strategic position within a well-mineralized corridor. Work by Cominco from 1959 to 1997 significantly advanced the project, while drilling ~ 2,000m north of the Duncan Mine, returned strong lead-zinc intersections. Rokmaster has continued to systematically advance Duncan Lake since 2018 identifying six major zinc-lead-silver occurrences, representing high-priority, drill-ready Tier 1 targets prospective for high-grade zinc and silver mineralization.

2025 Work (Overview)

Rokmaster’s work at the Duncan Lake Project in 2025 focused on advancing and derisking the project via surface trenching & channel sampling of key zones, confirming strong Zn-Pb-Ag mineralization at surface, expanding the critical element technical dataset, and ultimately positioning Duncan Lake for future drill testing.

Duncan Lake – Work Completed:

Long history of exploration, development, & advanced development by Cominco ’59-’97
Surface and underground work by Cominco established a historical resource of 4.3 million tons (3.9 million tonnes) grading 3.2% Zn and 3.1% Pb in four zones
Historical drilling by Teck
2022 – Small Drill Program, 681.2m, re-entered historic drill hole
2023 – No. 1 – 3 Zones – 127 soil samples, 22 rock samples
2025 – Prospecting, Trenching, Channel sampling across Duncan Lake No.3 Zone
2025 – Began advanced geochemical analysis to evaluate the mineralization for germanium, gallium, and indium concentrations

Results/Findings:

1980 – Samples – President Showing – 1.5% Zn, 169 g/t Ag, 2.7% Pb over 2.0m + 531 g/t Ag over 1.0m

North Mine Zone:

C89-5: 7.1% Zn and 4.6% Pb over 8.0 m
C91-7: 11.4 % Zn and 0.8% Pb over 4.8 m
C97-12: 6.2% Zn and 6.3% Pb over 7.5 m
2021 – Rock Samples – 6.28% Zn, 9.38% Pb, 78.0 g/t Ag
2022 – Small Drill Program, re-entered historic drill hole, cored a wide interval of Zn, Pb, Ag Mineralization
2022 – D22-02 – 2.06% Zn, 2.56% Pb, 8.38 g/t Ag over 20.85m, incl 4.94% Zn,7.29% Pb, Au 17.28 g/t over 3.66m, Ag 531 g/t over 1.0m,

No 1. Zone

2018- Sample – 24.33% Zn, 5.55% Pb
2023 – Sample P304659 – 22.51% Zn, 21.76% Pb, 49.8 g/t Ag
2025 – Channel sample – 12.1% Zn, 2.5% Pb, 6.7 g/t Ag, over 4.5m
Outcrop exposure, channel sampled returned 14.64% combined lead and zinc with 6.67 g/t Ag over 4.5 m

No. 2 Zone

2019 – Sample – 18.25% Zn, 11.73% Pb, 7.8 g/t Ag
2019 – Sample 17.8% Zn, 11.1% Pb, 20.0 g/t Ag

No 3. Zone

Trenches at the No.3 Zone returned high lead and zinc results with appreciable silver grades over meter-scale widths with channel sampling
2018 – Sample – 21.44% Zn, 13.0% Pb
2018 – Float Sample – 12.4% Zn, 1.1% Pb, 7.0 g/t Ag
2023 – Sample P304651 – 22.51% Zn, 21.76% Pb, 49.8 g/t Ag
2025 – Channel sample Trench 1 – 7.2% Zn, 4.1% Pb, 4.3 g/t Ag, over 3m
2025 – Channel sample Trench 2 – 6.9% Zn, 4.2% Pb, 4.9 g/t Ag over 3.5m
2025 – Channel sample Trench 5 – 3.9% Zn, 2.4% Pb, 1.6 g/t Ag over 3m

Mag Zone:

2021 – Rock samples 6.28% Zn, 9.38% Pb, 78.0 g/t Ag
2023 – Sample P4061325 – 16.76% Zn, 9.2% Pb, 53.9 g/t Ag
2023 – Sample 4060460 – 1.61% Zn, .03% Pb
2023 – Sample 4060455 – 1.26% Pb, 15.5 g/t Ag
2023 – Sample P304657 – 4.48% Zn, .3% Pb

Duncan Lake Property Maps

Duncan Lake Photo Gallery