Terra Critical Minerals Limited (ASX: T92) – High-Grade Silver at Castle Rag.
- Noel Ong
- Sep 25, 2025
- 4 min read
Announcement
Terra Critical Minerals Limited (ASX: T92) has reported further high-grade silver mineralisation from its 100% owned Castle Rag Project in New South Wales (Figure 1). The latest results build on previously reported intercepts and continue to highlight the project’s potential within the broader New England mineral field.
Figure 1: Location of Castle Rag Project (source: T92)
Key Highlights - Building a Silver Story
High-grade surface samples:
Silver up to 941 g/t Ag.
Lead to 18.9% Pb.
Antimony up to 266 g/t Sb.
Copper to 2.21% Cu.
14 samples >100 g/t Ag identified from 23 historical surface samples collected in 2022.
Results strengthen earlier work that returned:
1,670 g/t Ag.
445 g/t Ag & 1.12% Cu.
210 g/t Ag, 1.19% Cu, 1.19% Pb, 0.41% Zn.
120 g/t Ag & 5.25% Pb
The Castle Rag Silver Mine historically produced 4,000 t for 48 t Ag and 692 t Pb, a scale significantly larger than the nearby Webbs Silver Deposit (5.5 t Ag)
Project Context
Castle Rag forms part of Terra’s New England portfolio (Figure 2), which includes:
Ottery Tin Mine.
Mole River base metals project.
Glen Eden – host to NSW’s largest tungsten deposit.
Figure 2: Location of Castle Rag and other T92 Projects (source: T92)
The company continues to expand its presence in critical metals, positioning Castle Rag as a potential analogue to Webbs, but with a broader production history.
Rock Chip Sampling Results
The 2022 surface sampling program (Great Southern Precious Metals) returned significant results across three key prospects (Figure 3):
Figure 3: Silver samples >100 g/t with regional geology (source: T92)
Castle Rag Silver Mine.
Matt & Walkers Deposit (500m north) (Figure 4).
Gilligan’s Deposit (1,200m northeast) (Figure 4).
Highlights include:
Sample R00535: 941 g/t Ag, 18.9% Pb, 266 g/t Sb.
Sample R00537: 723 g/t Ag, 2.21% Cu.
Sample R00543: 172 g/t Ag, 1.27% Pb.
Figure 4: Silver samples >100 g/t with regional TMI magnetics (source: T92)
Next Steps
T92 will now advance with:
Review of historical datasets.
Remote sensing and geophysics (including LiDAR).
Access approvals.
A full exploration program is planned following the analysis of past work, with focus on infill drilling and depth extensions to better define high-grade zones
Terra Uranium will proceed with a detailed review of historical datasets, geophysics, and remote sensing before developing a comprehensive exploration program. The focus will be on infill and step-out drilling to better define high-grade zones and test depth extensions, with a two-year program anticipated.
Samso Concluding Comments
Castle Rag add to Terra Critical Minerals NSW portfolio. These are early-stage surface rock chip results, but the grades speak for themselves. Silver numbers approaching 1,000 g/t, combined with meaningful lead, copper, and antimony credits, demonstrate a polymetallic nature of this system.
For investors, the potential key takeaway is the consistency of high-grade samples across multiple prospects. This not only validates the historical mining history at Castle Rag but also builds confidence that the project could deliver scale with modern exploration.
T92 is obviously going through a rebuilding phase, and the addition to the T92 story is one I am watching with interest. It would be encouraging to see the company start getting on the ground soon.
As always, the proof will come from drilling and systematic exploration. But with these results, Castle Rag is clearly not just a historical curiosity — it is emerging as a project with genuine potential to add shareholder value.
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