Columbia Gold-Silver Project
Sentinel Metals’ Columbia Gold-Silver Project is located in western Montana, 13km east of the town of Lincoln and 64km north-west of the state capital, Helena on 100% privately owned ground.
Existing large-scale Mineral Resource
The Columbia Gold-Silver Project hosts a JORC Inferred Mineral Resource Estimate of 21.4 million tonnes grading 1.34g/t Au for 920,000 ounces of contained gold.
Building on a substantial historical database
In addition to the Mineral Resource, the Project also hosts an Exploration Target of 22-27 million tonnes grading 1.1-1.4g/t Au for 800,000-1.2Moz of contained gold.
Tonnages and grades are represented as a low and high range and are an approximation only. The potential quantity and grade of the Exploration Target are conceptual in nature and there has been insufficient exploration drilling conducted to estimate a Mineral Resource.
At this stage, it is uncertain if further exploration drilling will result in the estimation of a Mineral Resource. The Exploration Target has been prepared in accordance with the JORC Code (2012).
Resource growth is being tested along strike and in areas of incomplete historical sampling through Sentinel’s 2026 drilling program.
The current Resource is just the beginning
Sentinel Metals benefits from a vast historical drill database that includes more than 34,000 samples.
Top 5 near-surface hits:
• 3.1m at 106.3 g/t Au from 33.5m (DC-009)
• 3.1m at 72.0 g/t Au from 45.7m (7UP-247A)
• 12.2m at 11.6 g/t Au from 1.5m (PD-90-166)
• 12.2m at 9.7 g/t Au from 48.8m (PD-90-128)
• 28.9m at 3.9 g/t Au from 3.0m (COL12-001)
Top 5 longest intercepts:
• 132.6m at 2.01 g/t Au from 15.2m (COL12-002)
• 117.4m at 2.27 g/t Au from 45.8m (7UP-247A)
• 83.8m at 2.01 g/t Au from 48.8m (COL12-003)
• 73.2m at 2.09 g/t Au from 79.3m (7UP-202A)
• 67.1m at 2.01 g/t Au from 0m (COL12-001)
A great place to do business
Montana offers a compelling setting for new mine development, supported by a stable regulatory environment and strong infrastructure.
*The MRE is constrained within a US$2,200 / Au oz optimised shell and above a 0.4865g/t AuEq cut-off grade. The MRE has been optimised and reported using a gold equivalent value based on the following formula: AuEq (g/t) = Au (g/t) + Ag (g/t) × (US$30 ÷ US$2,200) × (77% ÷ 96%).
Historical drill results. Refer to the Company’s Prospectus dated 17 September 2025, released to ASX on 28 October 2025
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