Could Redstone’s Latest Drilling Unlock a Major Magmatic Copper System?
Redstone Resources has reported significant new high-grade copper intersections at unprecedented depths beneath its Tollu Copper deposit in Western Australia, hinting at a larger magmatic sulphide system. The company also secured government grants and raised capital to advance exploration.
- TLD005 drill hole reveals high-grade copper mineralisation over 400m deeper than previous records
- Evidence suggests a magmatic sulphide source for copper and cobalt, enhancing project potential
- Government EIS grants awarded to co-fund further drilling programs
- Private placement raised $650,000 to support ongoing exploration
- No exploration activity reported for James Bay Lithium JV or HanTails Gold Project this quarter
Deepening the Tollu Copper Story
Redstone Resources Limited (ASX, RDS) has delivered a compelling update from its West Musgrave Copper Project in Western Australia, revealing that its latest diamond drill hole, TLD005, has intersected multiple zones of high-grade copper mineralisation at depths far exceeding previous exploration efforts. Completed in June 2025, this hole reached a depth of nearly 1,200 metres, uncovering copper mineralisation some 400 metres deeper and 130 metres further south than any prior drilling at the Tollu Copper deposit.
These findings not only extend the known vertical and lateral footprint of copper mineralisation but also hint at a more complex and extensive mineral system than previously understood. Notably, the drill hole intersected significant copper grades including 1.8 metres at 2.5% copper from 912 metres and 4 metres at 1.3% copper from 1,048 metres, with a high-grade portion of 1.6 metres at 2.7% copper within that interval.
A Magmatic Sulphide Source Emerges
Beyond copper, the geochemical analysis of TLD005 revealed cobalt in sulphide form, predominantly associated with an underlying gabbroic intrusion. This is a crucial insight, as it supports Redstone’s hypothesis that the Tollu copper mineralisation may derive from a Voisey’s Bay style magmatic sulphide system; a type of deposit known for containing copper, nickel, cobalt, and platinum group elements.
The presence of this mafic gabbro intrusion beneath the Tollu veins, confirmed by the drilling, elevates the prospectivity of the entire West Musgrave Project. It aligns Tollu with world-class deposits such as the nearby Nebo-Babel deposit, located just 60 kilometres to the west, and the famous Canadian Voisey’s Bay deposit, both renowned for their rich magmatic sulphide mineralisation.
Funding and Forward Plans
To support further exploration, Redstone secured two Environmental Impact Statement (EIS) co-fund grants from the Western Australian government, totalling up to $400,000. These grants will subsidise a universal reverse circulation (RC) drilling program targeting magnetic anomalies northeast of Tollu, as well as a further deep diamond drill hole. Complementing this, the company raised $650,000 through a private placement to sophisticated investors, bolstering its financial position to advance its drilling campaigns.
Redstone’s management has indicated that follow-up drilling will focus on testing the extent of the newly discovered deep mineralisation and exploring the numerous high-quality magnetic targets identified in the region. The company is also continuing detailed geological and geochemical studies of the TLD005 core to refine its exploration strategy.
Other Projects and Corporate Highlights
While the West Musgrave Project remains the primary focus, Redstone’s joint venture lithium projects in James Bay, Québec, Canada, and its HanTails Gold Project near Kalgoorlie, Western Australia, saw no exploration activity during the quarter. The company also received a $370,000 research and development tax incentive for FY25, contributing positively to its cash flow.
At quarter’s end, Redstone reported a strong cash balance of $821,000, positioning it well to fund upcoming exploration activities. The company’s strategic moves underscore its commitment to unlocking value from its copper assets amid a supportive copper price environment.
Bottom Line?
Redstone’s deep drilling breakthrough at Tollu could redefine the scale of its copper system, setting the stage for a pivotal exploration phase in 2026.
Questions in the middle?
- Will further drilling confirm connectivity between the deep TLD005 mineralisation and the known Tollu copper zones?
- How might the cobalt sulphide findings influence the economic viability and resource classification of the project?
- What is the timeline and scope for the upcoming RC drilling program funded by the EIS grants?
