Alvo Minerals

Metallurgical Tests Confirm Bluebush as Ionic Adsorption Clay REE Project

Exceptional magnet rare earth extractions up to 83% using ammonium sulphate solution

Alvo Minerals Limited (ASX: ALV)(“Alvo” or the “Company”) is pleased to announce results from initial metallurgical testwork undertaken on auger drill samples from the Bluebush Ionic Clay Rare Earth Project (“Bluebush” or “The Project”). Bluebush is located on the northern half of the Serra Dourada granite, the same host rock of the Serra Verde Ionic Clay REE deposit (“Serra Verde”), believed to be the only ionic clay project currently being commissioned outside of China.


  • Initial metallurgical testwork on auger samples shows excellent extractions of rare earth elements (REE) using industry standard ammonium sulphate solution (AMSUL) .
  • High-value magnet rare earths (MRE) recovery rates using weakly acidic (pH 4) AMSUL at ambient temperatures achieved the following extractions (after 30 minutes):
    • Neodymium (Nd): up to 89% averaging 60%.
    • Praseodymium (Pr): up to 86%, averaging 57%.
    • Dysprosium (Dy): up to 53%, averaging 37%.
    • Terbium (Tb): up to 69%, averaging 48%.
    • Total MRE (Nd,Pr,Dy +Tb): up to 83%, averaging 56%.
  • The results show that excellent REE desorption was achieved across samples taken from the Boa Vista and Sao Bento prospects using industry standard conditions and crucially confirms that the Bluebush Project is an ionic (adsorption) clay REE project.
  • Metallurgical samples will be tested from current diamond drilling to target high-grade zones and further optimise recovery ratios.
  • Diamond drilling continues at the highest grade MRE zones, to test the depth profile and extent of the ionic clay. Auger results include results up to 3m @ 3,415ppm TREO at EOH.
  • Truck mounted auger drilling continues to test extents of the mineralisation (open in all directions) and some handheld auger is also underway to test for new regional prospects.

The results confirm the status of Bluebush as an ionic clay (adsorption) REE project, important due to the simpler potential mining and processing costs with associated lower capital and operating costs than other hard rock or simple clay hosted REE prospects.

Rob Smakman, Alvo’s Managing Director commented on this critical step:

“This is a significant step forward for Bluebush with the confirmation of Ionic clay adsorption hosted mineralisation at both Boa Vista and Sao Bento. The results are outstanding for initial metallurgical testwork with individual samples of MRE’s recovering up to 83%.

We have said from when we acquired this exciting project, there were three things we wanted to clearly demonstrate during the due diligence period: Scale, Grade, and Ionic Clay (Adsorption) Mineralisation. Our results released to date have demonstrated high grades of TREO and MREO near surface and over broad areas at both Boa Vista and Sao Bento prospects, covering the potential size and grade questions. The final, and possibly the most important factor, was establishing the presence of ionic clay adsorption hosted mineralisation. The testwork released today shows this.

With samples from over 130 auger holes still in the lab, ongoing diamond drilling, regional exploration through handheld auger drilling and the initiation of the Loupe geophysical surveys, we expect there will be plenty to report leading into the end of CY2023 from the Bluebush Ionic REE Project.”

Bluebush Metallurgical Results

The results reported here are from auger drilling at the Boa Vista and Sao Bento prospects, part of the larger Bluebush Project (see Figure 1). Samples were collected at 1-2m intervals and sent to the SGS GEOSOL lab in Goiania and Belo Horizonte, Brazil.

Standard sample preparation at the lab (see Appendix 1) was undertaken before a sample was screened to - 4mm. The ionic adsorption clay-hosted rare earth element leach test used a diluted solution of 0.5 molar ammonium sulphate at room temperature and a pH 4 for 30 minutes. Recoveries above 30% are considered by Alvo to confirm the ionic nature of the mineralisation.

Future metallurgical investigations will be designed using the follow-up auger drilling and diamond drilling samples to improve the overall MREO recoveries and develop a more complete understanding of the nature of the clays. It is important to note that the results of the AMSUL desorption stage are un-optimised, and further work to seek to further improve REE extractions is being planned.

Click here for the full ASX Release

This article includes content from Alvo Minerals, licensed for the purpose of publishing on Investing News Australia. This article does not constitute financial product advice. It is your responsibility to perform proper due diligence before acting upon any information provided here. Please refer to our full disclaimer here.

The Conversation (0)
True North Copper

TNC 2024 Exploration Program: Targeting Transformative Discoveries

True North Copper Limited (ASX:TNC) (True North, TNC or the Company) is pleased to announce its 2024 Exploration Program across TNC’s Mt Oxide and Cloncurry Copper Projects (TNC 2024 Exploration Program presentation attached below).
Keep reading...Show less
Miramar Resources

Bangemall Ni-Cu-PGE Exploration Update

Miramar Resources Limited (ASX:M2R, “Miramar” or “the Company”) is pleased to provide an update on exploration activities within the Company’s large 100%-owned Bangemall Project in the Gascoyne region of Western Australia.

Keep reading...Show less

Lundin Mining Fourth Quarter and Full Year 2023 Results

Lundin Mining Logo (CNW Group/Lundin Mining Corporation)

TSX: LUN) (Nasdaq Stockholm: LUMI) Lundin Mining Corporation ("Lundin Mining" or the "Company") today reported its fourth quarter and full year 2023 financial results. Unless stated otherwise, results are presented on a 100% basis and Caserones results are from July 13, 2023 .

News Provided by Canada Newswire via QuoteMedia

Keep reading...Show less
Forum Energy Metals to Present in March at the Red Cloud Pre-PDAC Mining Showcase and the PDAC 2024 Convention in Toronto, Canada

Forum Energy Metals to Present in March at the Red Cloud Pre-PDAC Mining Showcase and the PDAC 2024 Convention in Toronto, Canada

You are welcome to join Forum Energy Metals (TSXV: FMC) (OTCQB: FDCFF) at the Red Cloud Pre-PDAC Mining Showcase on Thursday, February 29 and Friday, March 1 at the Sheraton Centre Toronto Hotel followed by the PDAC Convention at the Metro Toronto Convention Centre, Sunday March 3rd through Wednesday March 6th.

Dr. Rebecca Hunter, VP, Exploration will be presenting at the Red Cloud Pre-PDAC Mining Showcase at 10:00am on Thursday, February 29th. Dr. Hunter will update investors on her plans for drilling on Forum's Thelon Basin uranium discovery in Nunavut, the next premier uranium mining district. For registration details visit:

News Provided by Newsfile via QuoteMedia

Keep reading...Show less

Ero Copper Announces 2023 Production Results and Provides 2024 Guidance

(all amounts in US dollars, unless otherwise noted)

Ero Copper Corp. (TSX: ERO, NYSE: ERO) ("Ero" or the "Company") is pleased to announce its 2023 production results, 2024 guidance and three-year production outlook.

News Provided by GlobeNewswire via QuoteMedia

Keep reading...Show less
Forte Minerals (CSE: CUAU)

Forte Minerals Releases First ESG Report

Forte Minerals Corp. ("Forte" or the "Company") (CSE: CUAU) (OTQB: FOMNF) (Frankfurt: 2OA), a junior exploration company with a focus on copper and gold projects in Peru, is proud to announce the publication of its initial Environmental, Social, and Governance (ESG) report. This milestone document shows a significant stride in Forte Minerals' journey towards sustainable exploration and mining practices and underscores our unwavering commitment to responsible operations.

Under the leadership of Patrick Elliott, MSc, MBA, CEO, and President of Forte Minerals, the Company has embarked on a sustainable exploration and development journey. "The release of our 2023 ESG report is pivotal for the Company. It echoes over 15 years of dedicated engagement with the Peruvian landscapes and communities, emphasizing our proactive adoption of ESG principles that guide our exploration endeavors," stated Elliott. "This report showcases our commitment to sustainability, ethical conduct, and community engagement and sets a foundation for continuous improvement in our operations."

Keep reading...Show less

Latest Press Releases

Related News