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    Indium from mine waste: process design and project notes for Australia’s solar sector

    November 20, 2025|

    Reviewed by Joe Ashwell

    Indium from mine waste: process design and project notes for Australia’s solar sector

    First reported on Australian Mining

    30 Second Briefing

    Indium recovered from existing mine waste streams could underpin a domestic Australian solar PV manufacturing sector, with a new study pointing to tailings from zinc and lead operations as a major untapped source. Researchers note that indium is a key component in indium tin oxide (ITO) coatings for high‑efficiency thin‑film cells, yet Australia currently exports concentrates and imports finished solar modules. The work signals opportunities for retrofitting hydrometallurgical circuits at established base‑metal plants to extract indium, adding revenue while reducing long‑term tailings liabilities.

    Technical Brief

    • Study models indium recovery from zinc–lead tailings using hydrometallurgical reprocessing scenarios at existing sites.
    • Researchers used mine production statistics, tailings tonnages and mineral processing flow sheets as primary data sources.
    • Analysis considers spatial distribution of suitable tailings facilities across Australian zinc and lead operations.
    • Work evaluates compatibility of indium extraction with current concentrator and refinery circuits to minimise new capital.
    • Authors assess potential reduction in long-term tailings liabilities when indium-bearing waste streams are reprocessed.
    • Practical application includes integrating indium solvent-extraction–electrowinning steps into brownfield base-metal plants.
    • Scope is limited to indium associated with zinc–lead operations; other host systems are not quantified.
    • Findings mainly provide strategic resource estimates; detailed plant-level feasibility and metallurgical testwork remain outside scope.

    Our Take

    Indium barely features in our recent Mining coverage compared with battery metals, so a focus on Australia suggests researchers are probing niche critical-metal streams beyond the usual lithium–nickel–cobalt set.

    For Australia, positioning indium recovery from mine waste could dovetail with existing base-metal operations, potentially giving operators a route to monetise tailings while improving ESG metrics under the ‘Sustainability’ project tag.

    Research-led pieces in our database tagged both ‘Research’ and ‘Projects’ often precede pilot-scale trials, so any lab work on indium extraction from waste streams may quickly translate into small demonstration plants at Australian mine sites.

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    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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