Green & Gold Minerals has delivered its first drill results at Copper Hills, surpassing historic grades with exceptional copper, silver, tin, indium, and zinc intercepts, confirming a significant hydrothermal system and expanding exploration potential.
- Maiden drilling exceeds historic copper, silver, tin, indium grades
- High-grade intercepts include 5m at 131 g/t Ag and 205 g/t In
- Large circular radiometric anomaly suggests substantial hydrothermal system
- Sentinel prospect shows encouraging gold results consistent with porphyry style
- Further drilling planned at Copper Hills, Sentinel, Siberia, and Mt Wandoo
Copper Hills Maiden Drilling Surpasses Historic Benchmarks
Green & Gold Minerals (ASX:GG1) has announced maiden reverse circulation drilling results at Copper Hills that not only confirm but significantly exceed historic grades for copper, silver, tin, indium, and zinc. The highlight is a 5-metre intercept grading 131 g/t silver, 1.05% copper, 205 g/t indium, 0.37% tin, and 9.1% zinc from 102 metres in hole CHC003, including a 2-metre zone with even higher grades of 300 g/t silver and 2.3% copper.
These results mark the highest-grade drill intercept recorded at the project and reveal a thickening of the mineralised lode at depth, suggesting the deposit's potential scale and richness were previously underestimated. The presence of critical metals such as indium and tin, which were not assayed in historic drilling, adds a fresh dimension to Copper Hills’ strategic value amid rising demand for electrification and AI data centre metals.
Emerging Hydrothermal System Defined by Radiometric Anomaly
Geophysical reprocessing has unveiled a prominent circular radiometric anomaly coincident with Copper Hills, interpreted as the footprint of a large hydrothermal system. This anomaly features a central potassium enrichment zone surrounded by a depletion halo, consistent with intrusion-related alteration. The anomaly aligns spatially with the deepest historic mine workings and the highest-grade drill intercepts, indicating a substantial mineralising system potentially extending well beyond current drill coverage.
Green & Gold’s Managing Director Quentin Hill emphasised the significance, noting the anomaly's scale suggests prolonged heat and fluid flow from a deep source intrusion. This hydrothermal footprint underpins plans for further drilling aimed at testing extensions down-dip and along strike, as well as exploring parallel mineralised structures.
Gold Potential Confirmed at Sentinel Prospect
Complementing Copper Hills, the company reported encouraging gold results from the Sentinel prospect within its Chillagoe Gold Project. Hole RDR004 intersected multiple gold-bearing intervals, including 1 metre at 2.97 g/t gold from 32 metres, associated with bismuth and tellurium; a geochemical signature consistent with porphyry-related gold mineralisation akin to nearby Mungana and Red Dome deposits.
These findings reinforce Sentinel’s potential as a Mungana-style gold porphyry target and justify planned deeper drilling to delineate a possible source intrusion or denser vein networks.
Expanding Exploration Footprint and Next Steps
Beyond Copper Hills and Sentinel, Green & Gold is advancing drilling at Mt Gossan with assays expected within six weeks and preparing a 3,000-metre campaign at Mt Wandoo to extend mineralisation and support resource confidence. Initial drilling at the Siberia prospect is also on the agenda for the December quarter, aiming to test further copper-silver-indium targets identified by historic geophysics and surface sampling.
The company’s strategy leverages its recent acquisition of the Herberton Conductor Metals Project and ongoing exploration success to build a portfolio of polymetallic deposits rich in critical and conductor metals. With global demand for these metals at historic highs, Green & Gold’s results position it well to capitalise on emerging market trends.
Bottom Line?
Copper Hills’ maiden drilling has set a high bar, but the true scale and economic viability of these polymetallic deposits remain to be proven through deeper drilling and metallurgical studies.
Questions in the middle?
- How will further drilling refine the extent and grade continuity of Copper Hills’ mineralisation?
- What metallurgical challenges might arise from the complex polymetallic mix, including indium and tin?
- Can Sentinel’s gold mineralisation be linked definitively to a porphyry system with economic potential?