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    Nyrstar’s Port Pirie antimony pilot: flowsheet and retrofit notes for engineers

    November 21, 2025|

    Reviewed by Joe Ashwell

    Nyrstar’s Port Pirie antimony pilot: flowsheet and retrofit notes for engineers

    First reported on Australian Mining

    30 Second Briefing

    Nyrstar has produced its first antimony metal from a pilot plant at the Port Pirie smelter in South Australia, marking Australia’s initial domestic antimony casting from a multi-metal facility. The pilot uses existing lead–zinc smelting infrastructure to process antimony-bearing feed, aiming to validate flowsheet performance and metal quality before any scale-up. For process and project engineers, the move signals potential future integration of antimony circuits into established base metal plants, reducing reliance on imported antimony trioxide and metal.

    Technical Brief

    • For other polymetallic smelters, the approach suggests a retrofit pathway to add critical metal circuits.

    Our Take

    Nyrstar’s move into antimony at Port Pirie comes as the company also features in our coverage of Rio Tinto’s planned 40% output cut at the Yarwun alumina refinery, signalling that Trafigura-linked Nyrstar is increasingly central to Australian non-ferrous supply chains rather than just a niche smelter operator.

    Antimony appears only sparsely in our Mining coverage compared with bulk commodities, so an Australia-based source at Port Pirie could become strategically important for downstream users seeking to diversify away from traditional supply centres in Asia and the CIS.

    Locating antimony production in South Australia, where permitting and industrial infrastructure are relatively mature, likely reduces geopolitical and logistics risk for defence and energy-storage applications that depend on secure antimony supply.

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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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