GreenTech Drilling Program Targets Historic Munni Munni PGE Prize

GreenTech Metals has taken a practical step toward reviving one of Australia’s most intriguing platinum group element deposits, completing a Phase 1 drilling and sampling campaign at the Munni Munni PGE-Cu-Ni project in Western Australia.

The program is less about immediate discovery and more about validation - specifically converting a long-standing historical resource into a modern JORC-compliant estimate. If successful, it could reposition Munni Munni as a credible platinum group metals (PGE) development story at a time when global supply concerns are sharpening.

According to the company, the campaign was completed ahead of schedule and under budget, thanks to a strategic pivot that leaned heavily on preserved historic drill core rather than new drilling.

A Program Focused on Resource Validation

GreenTech drilled a total of 12 holes for 2,682 metres using a mix of reverse circulation and diamond drilling techniques. Six of those holes were designed as infill drilling to improve understanding of resource continuity across key areas of the deposit.

However, the real efficiency gain came from the condition of the historic drill core stored on site. Rather than completing the originally planned 20-hole, 6,000-metre program, the company opted to resample mineralised sections from 16 historic drill holes.

The preserved core effectively substituted for a large portion of new drilling, enabling the company to collect the necessary QA/QC data while significantly reducing drilling costs and timelines.

In total, 2,143 samples from both new drilling and historical core have been dispatched to ALS Global’s Perth laboratories, with assay results expected within four to six weeks.

The results will feed into a resource verification program being undertaken by independent consultants Snowden Optiro, who are working to convert the project’s historic estimate into a JORC (2012) compliant mineral resource.

Reworking a Large Historical Resource

The Munni Munni project already boasts a substantial historical resource estimate - albeit one reported under the now-superseded JORC 2004 code.

Previous operators defined an estimate of 24 million tonnes grading 2.9g/t 4E (platinum, palladium, rhodium and gold) for approximately 2.2 million ounces of contained metal.

That estimate was generated from an extensive drilling campaign conducted between 1985 and 2002 comprising more than 91,000 metres of drilling across 328 holes.

While sizeable, the estimate cannot be relied upon under current reporting standards without modern validation work. That’s the gap GreenTech is aiming to close.

Chief executive James Rattenbury says the completed program marks a critical step in unlocking the project’s potential.

“We are very pleased that our Phase 1 drill program at Munni Munni was completed ahead of schedule due to the availability and suitability of the stored historical drill core,” he said.

“This has accelerated our program, reduced costs, and pushes us closer to a key objective of unlocking the full potential of this world-class platinum-palladium-copper-nickel project.”

If laboratory results confirm the integrity of historic data, GreenTech expects to produce an updated JORC-compliant resource estimate in the second quarter of 2026.

A Rare Australian PGE System

Munni Munni is not just another polymetallic project. It sits within one of Australia’s few recognised layered PGE intrusions - geological systems that host platinum group metal deposits comparable in style to major global operations.

The key mineralised horizon is the Ferguson Reef, a laterally extensive PGE-bearing layer that hosts platinum, palladium, rhodium and gold along with copper and nickel sulphides.

Historically, the project attracted considerable attention and underwent substantial drilling, metallurgical testwork and development studies. However, weak platinum and palladium prices at the time stalled development.

Market dynamics have shifted considerably since then.

Platinum group metals remain strategically important for catalytic converters, hydrogen technologies and emerging clean energy applications. Supply, meanwhile, is heavily concentrated in South Africa and Russia, making alternative jurisdictions increasingly attractive.

GreenTech believes the Munni Munni system still holds substantial growth potential. Mineralisation remains open both along strike and at depth, and the company now controls a consolidated land package covering more than 346 square kilometres across the broader intrusion.

This expanded tenure provides scope for district-scale exploration targeting additional PGE reefs and sulphide accumulations along parallel structural corridors.

Strategic Location in the Pilbara

Another advantage is location.

Munni Munni sits in Western Australia’s Pilbara region on granted mining leases and close to existing infrastructure. The project is also near the Radio Hill processing facility, although no processing agreement is currently in place.

GreenTech already operates nearby at its Whundo copper-zinc-gold project, meaning the company has an established operational footprint in the region.

That proximity could prove advantageous if Munni Munni ultimately progresses toward development.

Waiting on the Assays

For now, investors will be watching for the laboratory results expected in April. Those assays will determine whether the historic data stands up to modern scrutiny.

If it does, the project could soon emerge with a JORC-compliant resource underpinning one of the largest platinum group metal inventories in Australia.

For GreenTech, the message is clear: the heavy lifting at Munni Munni may have been done decades ago - but modern validation could finally bring the deposit back into the spotlight.