Power Minerals Ltd (ASX:PNN) Commences Leach Testing on High-Grade Ree Samples From Santa Anna Project
2 September 2025
Price Sensitive Announcement $
Overview:
▪ Leach testing of high-grade REE weathered zone for ionic clays from
the Santa Anna Project in Brazil has commenced to assess recovery
rates and processing pathways.
▪ The high-grade samples obtained from Power’s recent RC drilling program consist of 23 individual samples, six intervals from five separate drillholes
▪ The drillhole test samples provided for leach testing average 0.75% TREO (7,523 ppm), and are considered representative of the highgrade weathered clay layer sampled to date at the Project
▪ Samples have been sent for leach testing at independent laboratory
SGS Geosol in Brazil and results are expected in the current month.
▪ Power’s drilling at Santa Anna has returned exceptionally high-grade results up to 4.34% TREO (43,385 ppm)1, containing 26.0% MREO
▪ These include Nd and Pr which are essential REE for permanent magnets in EVs, wind turbines, and other defence technologies
▪ Power’s maiden RC drilling has shown that niobium and REE mineralisation extends deep into the fresh rock in addition to an exceptional REE-rich clay layer near-surface
▪ Power holds the entire Santa Anna Carbonatite Alkaline Complex
under two permits covering 17.05km2 and views the Project as a significant scale exploration and development opportunity
Overview:
Power Minerals Limited has announced it has commenced a leach testing program on high-grade drilling samples from the weathered zone of the Santa Anna niobium-rare earth element (REE) carbonatite project (“Santa Anna” or “the Project”) in Goiás State, central Brazil.
The leach testing program is being undertaken on samples from Power’s recently completed maiden reverse circulation (RC) drilling program at Santa Anna, which returned exceptional high-grade clay-rich REE results and high-grade niobium intersections
An overview of the leach testing program, which is being conducted by SGS Geosol Laboratories in Brazil, is provided in Appendix 2.
The leach testing is targeting the near-surface layer of clay-rich REE-bearing clays, down to a potential depth of 50m of weathered material.
To date, only a small portion of the Santa Anna alkaline complex has been thoroughly drilled, leaving significant areas without sampling. Power’s goal is to systematically map and sample the niobium and REE mineralisation both laterally and at depth.
Background to leach testing program
Power is analysing 23 samples currently in the current leach testing program, which have been collected from six separate intervals across five individual drillholes from Power’s recent drilling program (see Appendix 1).
The 23 drillhole samples average 0.75% TREO (7,523ppm). This average grade is considered representative of the high-grade weathered clay layer. There are multiple intervals exceeding 1.0% TREO, highlighting the consistent high-grade mineralisation in the sampled area.
Each individual sample represents one metre and the intervals range from 3m to 5m. The five RC drillholes were selected to test various areas of the alkaline complex with the two furthest holes over 900m apart.
Company Notes:
“The leach testing program is an important next step in our exploration pathway at the Santa Anna Project. The independent leach testing of high-grade REE samples from our recent drilling at Santa Anna will provide us with a clearer picture of what may be recovered in terms of the key light rare earth elements, neodymium and praseodymium, as well as niobium from the Santa Anna Complex. This testing is set to confirm REE weathered zone for ionic clays which will allow for processing pathways to be advanced.
In turn, these results will help inform our targeting for our planned ongoing drilling at the Project, which aims to deliver a maiden Mineral Resource Estimate subject to results. The leach testing results are anticipated to be available in the current month.”
Power Minerals Limited Managing Director, Mena Habib
Full ASX Announcement: https://www.powerminerals.com.au/site/pdf/56fde5f8-2f27-4825-b889-78d83ee71179/HIGHGRADE-REE-LEACH-TESTING-COMMENCES.pdf?Platform=ListPage