Green & Gold Minerals has pinpointed high-grade copper, silver, tin, and indium mineralisation at two major targets in Queensland’s Herberton Conductor Metals Project, with drilling set to follow a May campaign at Copper Hills.
- High-grade polymetallic rock chip results at Mt Gossan and Siberia
- Undrilled Mt Gossan breccia shows strong scale and metal potential
- Siberia vein system extends over 5km with historic drilling support
- Drilling to commence post-Copper Hills campaign in late May 2026
- Laboratory assays pending to verify portable XRF findings
Polymetallic Targets Highlighted by Spot XRF Analysis
Green & Gold Minerals (ASX:GG1) has revealed compelling high-grade copper, silver, tin, and indium mineralisation at its Mt Gossan and Siberia prospects within the Herberton Conductor Metals Project in Queensland. Portable XRF rock chip sampling has returned standout spot readings including 24.7% copper, 419 g/t indium, 126 g/t silver, and notable tin and tungsten grades from mine dump and outcrop samples. While these spot measurements do not represent average in situ grades, they signal strong polymetallic potential that warrants follow-up drilling.
The company’s recent reconnaissance builds on its acquisition of the Herberton project earlier this year, which added a substantial footprint in a region historically known for tin but increasingly recognised for copper-silver-indium systems leveraged to electrification and AI demands. The project’s location within the O’Brien’s Creek Supersuite of late Carboniferous granites underpins its polymetallic mineralisation style, similar to neighbouring discoveries. This latest update complements the company’s earlier high-grade metals and rare earths findings at Herberton.
Mt Gossan Breccia Emerges as a Large Undrilled Target
The Mt Gossan breccia, a gossanous quartz-veined sandstone breccia measuring up to 220m by 125m, remains untested by drilling. Portable XRF analyses reveal elevated copper and tin with silver and indium anomalies, including a peak indium reading of 576 g/t. Historic mine dumps and underground workings nearby show higher copper and silver with lower arsenic, indicating supergene leaching effects at surface. The breccia’s size and metal assemblage make it a highly prospective target for thicker breccia-style mineralisation and repeats of the Siberia lode structure.
Historic drilling around Mt Gossan has been limited to shallow holes testing the Siberia lode, which dips shallowly north and has demonstrated consistent copper, silver, and tin grades over 2-3m true widths. However, the breccia itself and potential lode repeats remain untested, representing a significant exploration upside. Preparations for drilling Mt Gossan are underway, with the program scheduled after the Copper Hills campaign. This follows the company’s recent Copper Hills drilling plans announcement indicating a busy exploration calendar.
Siberia Vein System Extends Over 5 Kilometres
Approximately 1.4km west of Mt Gossan, the Siberia vein system outcrops continuously for 5km and includes a hanging wall lode thickening the mineralised zone. Portable XRF readings from mine dumps reveal exceptional grades, such as 23.3% copper, 293 g/t silver, 558 g/t indium, and 4.2% tin. Historic drilling, though shallow and unverified, reported intercepts including 8m at 2.6% copper and 39 g/t silver, and 3m at 77 g/t silver with significant base metals. These results underscore the resource potential but require validation through modern drilling.
Magnetic surveys highlight a north-dipping magnetic high coincident with the Siberia lode, interpreted as a down-dip extension of mineralisation. Historic reports of magnetic pyrrhotite support this model, suggesting significant mineralisation remains open at depth. The Siberia system’s geological setting adjacent to the Emuford Granite aligns with polymetallic hydrothermal mineralisation typical of the region.
Drilling Plans and Next Steps
Green & Gold Minerals plans to commence drilling at Mt Gossan and Siberia following the late May 2026 Copper Hills and Chillagoe programs. Laboratory assays of conventional rock chip samples collected for gold and multielement analysis are pending, which will provide critical verification of the portable XRF results.
Beyond Mt Gossan and Siberia, reconnaissance will continue across the Herberton Conductor Metals Project, including historic copper mines along the Elizabeth Bluffs trend and the A1 Line. Meanwhile, work progresses on the Mt Wandoo gold development, complementing the polymetallic focus with precious metals exploration. The company’s strategy appears to be a multi-pronged approach targeting both base and precious metals with clear links to emerging technology demand.
Bottom Line?
Verification of assays and upcoming drilling will be pivotal in confirming the scale and grade of these polymetallic targets and shaping Green & Gold Minerals’ next exploration phase.
Questions in the middle?
- Will laboratory assays confirm the high-grade portable XRF spot readings at Mt Gossan and Siberia?
- Can drilling at the undrilled Mt Gossan breccia reveal thicker, economically viable mineralisation?
- How will the down-dip magnetic targets influence the interpretation and extent of the Siberia vein system?