GreenTech Metals Reports Exceptional High-Grade PGE-Copper Intercepts from Munni Munni Phase 1 Drilling

Phase 1 Drilling Delivers High-Grade Results Confirming Geological Model at Munni Munni

GreenTech Metals’ Phase 1 drilling at the Munni Munni PGE-Copper-Nickel Project has produced significant outcomes supporting the company’s focus on shallow, high-grade platinum group element and copper mineralisation. The campaign revealed new, thicker PGE-Cu-Ni zones and validated historic drilling data through twin hole drilling and core resampling. Notably, one intercept recorded 8.8 g/t PGE3 (platinum and palladium) with 0.65% copper and 0.35% nickel, representing some of the highest individual metal grades at Ferguson Reef and reinforcing the strategic emphasis on shallow high-grade zones.

Selected Phase 1 results include a reverse circulation hole intercepting 12 metres at 3.13 g/t PGE3, 0.30% copper, and 0.17% nickel from 90 metres depth, featuring a 2-metre higher-grade interval at 8.37 g/t PGE3, 0.63% copper, and 0.34% nickel from 98 metres. Additional intercepts include 11 metres at 1.15 g/t PGE3, 0.15% copper, and 0.11% nickel from 116 metres; 15 metres at 1.70 g/t PGE3 from 24 metres; and further mineralisation at depths of 173 and 183 metres across Ferguson Reef.

Twin Hole Drilling Validates Historical Data Accuracy at Ferguson Reef

A vital part of Phase 1 involved twin hole drilling to validate the historical dataset compiled between 1985 and 2002, which encompasses 91,077 metres of drilling over 328 holes. This historic dataset underpins a resource estimate of 23.6 million tonnes at 2.9 g/t 4E (platinum group elements plus gold) containing 2.2 million ounces. GreenTech’s twin hole results confirmed the reliability of historic assay data, enhancing confidence in geological interpretations and metal grades within the historical resource.

Reported twin hole intercepts include 11 metres at 1.88 g/t PGE3, 0.14% copper, and 0.09% nickel from 526 metres; 4 metres at 2.29 g/t PGE3, 0.29% copper, and 0.16% nickel from 244 metres; 6 metres at 1.57 g/t PGE3 from 324 metres; and 12 metres at 1.08 g/t PGE3 from 186 metres. These results provide a solid foundation for ongoing resource re-estimation and confirm mineralisation continuity across Ferguson Reef.

Independent Geochemical Analysis Broadens Exploration Targets and Identifies Basal Contact Zones

GreenTech commissioned independent geochemist Dr Scott Halley, an expert in magmatic sulphide systems, to perform a comprehensive review of the Munni Munni Project. This analysis delivered a breakthrough framework revealing untested potential beyond the historically known Ferguson Reef. It identified high-priority exploration targets along the intrusion’s basal contact and key geological controls on copper-nickel-PGE sulphide mineralisation, expanding the project’s exploration scope.

The review highlighted a substantial 5 km by 2 km copper anomaly centrally located within the intrusion and confirmed the basal contact as a prime target for massive copper-nickel sulphide accumulations. Guided by this framework, GreenTech initiated a ground-based Fixed-Loop Electromagnetic survey in July 2026 to detect conductors indicative of massive sulphides along the basal contact. A heritage survey is planned for mid-August 2026 to facilitate drilling of these priority targets. This strategic shift broadens exploration from a narrow focus on Ferguson Reef to a wider view of Munni Munni as a large-scale copper-nickel-PGE system with multiple prospective zones.

Resource Re-Estimation Focuses on Copper-Dominant Domains and Metallurgical Testing

Resource re-estimation efforts at Munni Munni continue, prioritising wireframing of copper-rich domains to refine the geological model. This reflects a strategic realignment based on Phase 1 drilling and geochemical insights, recognising copper as a key economic component. The re-estimation supports both resource update and scoping study objectives.

Parallel metallurgical testwork is progressing with emphasis on producing a primary copper-PGE concentrate. Developing metallurgical parameters, including Net Smelter Return calculations, is critical to assessing processing economics and informing the scoping study. The focus on copper-PGE concentrate production underscores the multi-commodity nature of Munni Munni mineralisation, aiming to recover copper and platinum group elements in a single concentrate. Completion of this testwork is a key milestone for resource and scoping study phases.

$7.5 Million Placement Secures Full Funding for Exploration and Development

GreenTech Metals announced full funding following a successful $7.5 million capital raise via a two-tranche placement at $0.075 per share. This funding underpins planned exploration and development activities at Munni Munni and Whundo projects through the second half of 2026 and beyond, supporting drilling, geophysical surveys, resource estimation, and metallurgical testing.

The placement reflects strong investor confidence in GreenTech’s exploration strategy and project potential. The two-tranche structure highlights investor trust in the company’s ability to achieve near-term milestones. With funding secured, GreenTech can focus on operational execution and project advancement without capital raising distractions.

Key Technical Appointments Enhance Expertise

Effective 27 July 2026, GreenTech appointed Ms Rachel Backus as Chief Geologist and Ms Heida Mani as Technical and Product Marketing Advisor. Ms Backus brings expertise in geological interpretation and resource estimation, while Ms Mani contributes technical knowledge in product development and market positioning. These appointments are critical to delivering the resource update and scoping study for Munni Munni.

The timing aligns with a pivotal development phase requiring integrated geological, resource, and metallurgical efforts. Adding a Chief Geologist to the permanent team demonstrates GreenTech’s commitment to in-house expertise for long-term project management and reflects the complexity of Munni Munni’s mineralisation. These hires support both near-term project milestones and future operational needs as the project advances.

Comprehensive Drill Programme Targets Copper Extensions and Basal Contact Mineralisation

GreenTech has secured drilling rigs for an extensive exploration campaign starting late July 2026 after site mobilisation. The programme includes 4,750 metres of reverse circulation drilling and 3,560 metres of diamond drilling, with wider diameter diamond holes planned for metallurgical composite sampling. This integrated approach balances expanding geological understanding with obtaining samples for metallurgical evaluation to support the scoping study.

Drilling plans allow flexibility to prioritise high-potential copper-gold extensions at the adjacent Whundo project before heritage survey completion at Munni Munni. Drilling at Munni Munni will initially focus on existing cleared pads, with basal zone targets prioritized post-heritage clearance in mid-August 2026. Additional activities include core resampling, reconnaissance sampling, and infill soil sampling across the basal contact to refine geological models. A government co-funded Fixed-Loop Electromagnetic survey commenced in early July 2026 over selected sections of the largely untested basal contact of the Munni Munni intrusion.

Whundo Project Offers Adjacent High-Potential Copper-Gold Exploration Opportunity

GreenTech’s portfolio includes the adjacent Whundo Cu-Zn-Au Project near Munni Munni in Western Australia’s West Pilbara region. While Munni Munni remains the primary focus, Whundo represents a complementary exploration asset. The upcoming integrated drill campaign will prioritize high-potential copper-gold extensions at Whundo, particularly ahead of heritage survey completion at Munni Munni.

This strategy leverages the prospective geological setting of both projects within the West Pilbara mining region. Maintaining exploration across Munni Munni and Whundo positions GreenTech to capitalize on multiple mineralisation systems. Allocating drilling metres to both projects underscores Whundo’s copper-gold potential as a near-term exploration priority.

Historical Resource Estimate Provides Basis for Updated JORC 2012-Compliant Resource

Munni Munni’s historical resource, compiled by HLX in 2002, reports 23.6 million tonnes at 2.9 g/t 4E (platinum group elements plus gold) containing 2.2 million ounces of precious metals. This includes 12.4 million tonnes measured, 9.8 million tonnes indicated, and 1.4 million tonnes inferred categories, based on 91,077 metres of drilling across 328 holes from 1985 to 2002, extending to approximately 800 metres depth. The resource comprises platinum, palladium, gold, rhodium, copper, and nickel credits, predominantly hosted within Ferguson Reef.

GreenTech continues resource re-estimation work aiming to produce an updated JORC Code 2012-compliant resource. The historical estimate includes a cautionary note that it does not comply with JORC 2012 standards and lacks sufficient work by a competent person for reclassification. Phase 1 drilling, core resampling, and new assay data will support development of the updated resource. The scale of the historical resource combined with Phase 1 high-grade intercepts suggests strong potential for a material updated resource estimate upon completion of re-estimation.