Chalice Defines High-Grade Copper-Rare Earth Anomaly at Deep Blue
Chalice Mining has outlined a compelling 2.5km copper-molybdenum-silver soil anomaly near Goomalling, WA, featuring rock chips with over 15% total rare earth oxides and strategic magnet rare earths. An initial drilling program is imminent.
- 2.5km copper-molybdenum-silver soil anomaly upgraded
- Rock chips show >15% total rare earth oxides (TREO)
- Strategic rare earths including Neodymium and Praseodymium detected
- Geophysics indicate large-scale skarn-style hydrothermal system
- Initial 10-hole RC drilling planned soon, land access secured
Exceptional Surface Grades Highlight Strategic Rare Earths Potential
Chalice Mining Limited (ASX:CHN) has revealed a standout copper and rare earth element (REE) target dubbed Deep Blue, located about 15km southeast of its Caravel Copper Project near Goomalling, Western Australia. The target boasts a coherent ~2.5km soil anomaly rich in copper, molybdenum, and silver, now materially upgraded by rock chip samples containing exceptional total rare earth oxides (TREO) grades exceeding 15%, including high-value magnet rare earths such as Neodymium (Nd) and Praseodymium (Pr).
The rock chips, collected from isolated outcrops within the anomaly, returned TREO values up to 19.3%, with copper reaching 384ppm and silver up to 19ppm. This rare earth assemblage also includes defence-critical elements like Dysprosium, Terbium, Samarium, Gadolinium, and Yttrium, underscoring the strategic significance of the discovery.
Geophysical Surveys Confirm Large-Scale Hydrothermal System
Ground geophysical work has reinforced the target’s prospectivity. Magnetic inversion modelling and gravity surveys reveal steeply northeast-dipping bodies extending over 2–3km, consistent with a substantial skarn-style hydrothermal mineral system. These geophysical anomalies coincide tightly with the soil and rock chip geochemical footprints, suggesting a well-constrained mineralised structure at depth.
Scanning electron microscopy of surface samples identified mineral assemblages dominated by allanite, monazite, and magnetite, consistent with the skarn-style affinities indicated by geophysics. This mineralogy hints at a polymetallic Cu-Ag-REE system, but the source remains concealed beneath residual soils with limited outcrop and no prior drilling.
Drilling Program Imminent to Test Multi-Kilometre Scale Target
With land access secured and regulatory approvals pending, Chalice plans to commence an initial 10-hole reverse circulation (RC) drilling campaign in the coming weeks. This program aims to test the multi-kilometre scale target for subsurface mineralisation and validate the surface geochemical and geophysical anomalies.
The Deep Blue target lies within the Northam JV Project, where Chalice is earning a 70% interest. The company’s strong balance sheet, with approximately AUD 63 million in cash and listed investments as of March 2026, supports this rapid advancement from surface sampling to drill testing.
Strategic Implications and Next Steps
The discovery of high-grade copper with significant rare earth elements at Deep Blue adds a new dimension to Chalice’s portfolio, complementing its established projects such as Caravel and Gonneville. The presence of critical magnet rare earths alongside copper and silver could position the project favourably amid growing demand for these elements in clean energy and defence technologies.
While the surface results and geophysical data are compelling, the absence of drilling means the true scale, continuity, and economic viability of the mineralisation remain to be tested. The upcoming RC drilling will be pivotal in confirming the deposit’s potential and guiding further exploration strategies.
Bottom Line?
Deep Blue’s surface grades and geophysics set the stage for a critical drilling campaign that could reshape Chalice’s exploration narrative.
Questions in the middle?
- Will the upcoming drilling confirm the continuity of high-grade copper and rare earth mineralisation at depth?
- How might the rare earth element mix at Deep Blue influence Chalice’s strategic positioning in critical minerals markets?
- What exploration targets will emerge from integrating geophysical data with drill results following the initial RC program?
