Green Manganese trials: residue retreatment and recovery gains for plant teams
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Green Manganese trials report high recovery of manganese alongside zinc extraction from hazardous smelter residues that would otherwise go to sludge settling ponds or disposal. The process targets industrial by-products such as filter cakes and leach residues, aiming to convert them into saleable metal units rather than waste. For plant metallurgists and residue managers, the results point to potential retrofits in existing hydrometallurgical circuits to cut tailings volumes and improve overall metal yield without new ore feed.
Technical Brief
- Residue handling is shifted from sludge ponds to enclosed, reagent-controlled processing, reducing operator exposure.
- Chemical immobilisation of remaining toxic elements reduces leachability risk under long-term storage conditions.
- Closed-loop liquor management limits airborne emissions and contact with high-pH or acidic solutions.
- Integration into existing plants avoids new tailings facilities, lowering geotechnical and dam safety obligations.
- For similar refineries, retrofits could convert legacy residue stockpiles into controlled, monitored processing campaigns.
Our Take
Green Manganese’s earlier hydrometallurgical test work on polymetallic nodules (15 September 2026 item) already showed multi‑metal recovery; adding zinc to manganese in the current trials suggests the same circuit could be tuned for broader critical‑mineral packages rather than single‑commodity flowsheets.
With South32 lifting Australia Manganese output in the September 2026 quarter, higher‑recovery ‘green’ manganese processes could become a differentiator for new entrants, especially where ESG‑linked offtake for battery‑grade material is competing against established bulk ore producers.
Our database shows manganese frequently co‑appearing with other critical minerals such as nickel, cobalt and copper, so a process that efficiently recovers both manganese and zinc positions Green Manganese‑style circuits well for polymetallic feedstocks, including seafloor nodules and complex onshore ores.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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