GreenTech Metals (ASX:GRE) has contracted a drill rig for mobilisation to site in late July ahead of an 8,300m drilling program at its Munni Munni and Whundo projects in Western Australia.
The program comprises 4,750m reverse circulation and 3,560m diamond drilling, including wider-diameter diamond holes for metallurgical composite collection.
A government co-funded fixed-loop electromagnetic (FLEM) geophysical survey will commence in early July over selected sections of the largely untested basal contact of the Munni Munni intrusion. The ground-based survey will cover approximately 8.2km² across 56.4 line kilometres, utilising four large transmitter loops at 75m station spacing.
The total survey cost is estimated at $200,000, with $100,000 in co-funding granted by the Western Australian Government under its Co-funded Geophysics Program.
CEO James Rattenbury says the program targets extensions to copper-dominant zones within the historic resource footprint.
“The commencement of the FLEM survey is a pivotal step in refining our drill targets at Munni Munni. The basal contact of the intrusion is largely untested and highly prospective for copper sulphide mineralisation,” Rattenbury says.
“The FLEM method has a proven track record in this style of setting, as demonstrated at the nearby Andover Complex, and we are confident it will sharpen our targeting ahead of drilling.”
Drill locations will initially be limited to existing drill pads at Munni Munni, with expansion following completion of an eight-day heritage survey scheduled to commence on 10 August. The survey will clear new drill locations and access routes across the Munni Munni mineralised footprint and other high-priority basal target areas.
A second rig is anticipated to join once additional areas receive heritage clearance, allowing drilling to expand across both projects.
Follow-up drilling at Whundo will focus on shallow extensions of known high-grade copper-gold mineralisation and will support collection of a metallurgical sample to enable testwork on recovery of gold and silver ahead of completing a resource update.
GreenTech is also advancing work on a Munni Munni resource re-estimation. The metallurgical test work on composited drill core samples from the Ferguson Reef mineralisation is ongoing, with results expected in August 2026.
The program has also been expanded to better characterise flotation of the copper-platinum group element-dominant sulphide assemblage and define parameters required to produce a copper-platinum group element (PGE) concentrate.
“The increasing importance of copper as a value driver for Munni Munni has prompted an expanded metallurgical testwork focus in support of our planned resource re-estimation,” Rattenbury says.
“Parallel discussions with potential offtakers have highlighted the importance of maximising copper value in concentrate, and we look forward to reporting further progress in due course.”
Results from the program will be used to define net smelter return parameters for input into the Munni Munni mineral resource update and an initial Scoping Study.
Write to France Pinzon at Mining.com.au
Images: GreenTech Metals
