# EMC: Mt Edon Rubidium Processing Advances Pilot Plant Development Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/emc-mt-edon-rubidium-processing-advances-pilot-plant-development--c7e8da4d-df40-4213-8673-5251377e96f1 Original source: https://www.asx.com.au/asx/v2/statistics/displayAnnouncement.do?display=pdf&idsId=03154288 Publisher: asx Original announcement: 2026-10-19T21:14:00.000Z Analysis by Minestarters Atlas Atlas analysis published: 2026-10-19T22:42:22.084Z Atlas analysis updated: 2026-10-19T22:42:22.084Z - Company: Everest Metals Corporation Ltd - Ticker: EMC - Exchange: ASX - Region: Western Australia - Primary commodity: Rubidium - Secondary commodities: Potassium, Lithium - Document categories: Metallurgy - Extracted: 2026-10-19 22:42:22 UTC Narrative sentiment: 0.70 · Bullish ## Minestarters Atlas summary Everest Metals Corporation has reported significant progress in metallurgical testwork for rubidium extraction and purification at its Mt Edon Critical Mineral Project in Western Australia. Key results include up to 90% rubidium recovery through batch roasting and water leaching, a 60% reduction in water use, and successful purification reducing the potassium-to-rubidium ratio to 1.5-2:1. The company is now advancing towards pilot plant development, having validated its in-house purification reagent manufacturing. Reasoning: The metallurgical testwork demonstrates strong rubidium recovery and purification efficiency, significantly de-risking the Mt Edon project and enabling progression to pilot plant development, despite initial challenges with continuous roasting scale-up that require further work. - Positive factor: High rubidium recovery \(up to 90%\) achieved in batch tests - Positive factor: Significant reduction in water use \(60%\) and energy requirements for leaching - Positive factor: Successful purification reducing potassium-to-rubidium ratio to 1.5-2:1 consistently - Positive factor: Validation of in-house DRE purification reagent manufacturing - Positive factor: Advancement towards pilot plant development with patent-pending technology - Positive factor: Metallurgical results compiled and assessed by a Competent Person - Negative factor: Continuous rotary-kiln trials showed lower and variable extraction \(50-60%\) due to material handling challenges, requiring further optimization - Negative factor: Estimated rubidium purity exceeding 98% is subject to further validation Low confidence — this extraction should be reviewed alongside the original source. Facts used in scoring: 2 ## Classification and evidence **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: Batch roasting and water leaching achieved up to 90% rubidium recovery, which is at the exceptional band for typical metallurgical processes. Evidence · text > up to 90% rubidium recovery from representative Mt Edon materials through batch roasting and water leaching **Bench Scale Only** Polarity: negative Definition: Only preliminary bench tests completed — no locked-cycle or pilot work. Why it applies: The company explicitly states its focus is on turning these bench scale laboratory results into a consistent, repeatable process at larger scale, indicating current work is at bench scale. Evidence · text > Our focus is on turning these bench scale laboratory results into a consistent, repeatable process at larger scale. **Single Domain Only** Polarity: negative Definition: Testing limited to one composite or domain — representativeness not established. Why it applies: Testwork was conducted using 'representative Mt Edon materials' and 'representative Mt Edon mineralisation', suggesting a single composite or domain was tested rather than multiple distinct ore domains. Evidence · text > The program utilised representative Mt Edon material containing approximately 2,800 ppm rubidium \(Rb\) and 43,900 ppm potassium \(K\) **Gravity Route** Polarity: neutral Definition: Gravity separation forms a material part of the flowsheet. Why it applies: the document describes a gravity route \("gravity"\) **POX/BIOX Route** Polarity: neutral Definition: Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX. Why it applies: the document describes a pox\_biox route \("roasting"\) **Multi-Domain Tested** Polarity: positive Definition: Variability across ore domains \(oxide, transition, fresh\) has been addressed. Why it applies: 2 distinct composites were tested ## Extracted facts Stored fact records: 2. Some facts used in scoring do not have a stored record. ## Metallurgical Results (2) ### batch roasting and water leaching [Link to this fact](https://atlas-staging.minestarters.com/news/emc-mt-edon-rubidium-processing-advances-pilot-plant-development--c7e8da4d-df40-4213-8673-5251377e96f1#fact-metallurgical-facts-0) Mt Edon Critical Mineral Project · rubidium #### Identity - Project: Mt Edon Critical Mineral Project - Commodity: rubidium - Region: australia\_wa - Reported Region: Western Australia - Ticker: EMC #### Test Work - Program Status: detailed - Test Type: batch roasting and water leaching - Processing Route: high temperature roasting to convert rubidium and other alkali metals into soluble salts, followed by water leaching - Sample: representative Mt Edon material containing approximately 2,800 ppm rubidium \(Rb\) and 43,900 ppm potassium \(K\), equivalent to 0.3% Rb2O and 5.2% K2O #### Recovery - Recovery: 90 % - Recovery Basis: actual\_test - Head Grade: 0.3 - Head Grade Unit: % Rb2O #### Lab - Laboratory: Edith Cowan University \(ECU\) Mineral Recovery Research Centre \(MRRC\) - Consultant: Dr. Amir Razmjou #### Location - Easting: 564578.4 - Northing: 6756433 - CRS: GDA2020 - Zone 50 - Loc. Confidence: high #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-10-19T00:00:00.000Z Reasoning: Achieved high rubidium recovery of 90% from batch roasting and water leaching, with significant process optimizations in water use and temperature, indicating a robust extraction stage. - Positive factor: High recovery for rubidium - Positive factor: Reduced water use \(60%\) and room temperature leaching - Positive factor: Effective purification demonstrated Evidence · text > up to 90% rubidium recovery from representative Mt Edon materials through batch roasting and water leaching #### Tags used in scoring **POX/BIOX Route** Polarity: neutral Definition: Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX. Why it applies: processing\_route matches the pox\_biox signal ### continuous rotary kiln [Link to this fact](https://atlas-staging.minestarters.com/news/emc-mt-edon-rubidium-processing-advances-pilot-plant-development--c7e8da4d-df40-4213-8673-5251377e96f1#fact-metallurgical-facts-1) Mt Edon Critical Mineral Project · rubidium #### Identity - Project: Mt Edon Critical Mineral Project - Commodity: rubidium - Region: australia\_wa - Reported Region: Western Australia - Ticker: EMC #### Test Work - Program Status: preliminary - Test Type: continuous rotary kiln - Processing Route: continuous rotary kiln roasting and leaching - Sample: approximately 60 kg of ore and reagents #### Recovery - Recovery: 60 % - Recovery Basis: actual\_test - Head Grade: 0.3 - Head Grade Unit: % Rb2O #### Lab - Laboratory: Edith Cowan University \(ECU\) Mineral Recovery Research Centre \(MRRC\) - Consultant: Dr. Amir Razmjou #### Location - Easting: 564578.4 - Northing: 6756433 - CRS: GDA2020 - Zone 50 - Loc. Confidence: high #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-10-19T00:00:00.000Z Reasoning: Continuous rotary kiln trials yielded lower and variable rubidium recovery \(50-60%\) due to material handling issues, indicating further optimization is required for scale-up. - Negative factor: Lower recovery compared to batch tests - Negative factor: Significant variability between tests - Negative factor: Material handling challenges in the kiln Evidence · text > The trials achieved rubidium extraction efficiencies of approximately 50–60%, with significant variability between tests. #### Tags used in scoring **POX/BIOX Route** Polarity: neutral Definition: Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX. Why it applies: processing\_route matches the pox\_biox signal ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.