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    South32 Hermosa Jameson Concentrator choice: process design notes for engineers

    August 13, 2026|

    Reviewed by Joe Ashwell

    South32 Hermosa Jameson Concentrator choice: process design notes for engineers

    First reported on International Mining – News

    30 Second Briefing

    South32’s Hermosa zinc-manganese-silver project in Arizona has selected Glencore Technology’s Jameson Concentrator for its processing plant, leveraging the compact Jameson Cell-based flowsheet to cut footprint and energy use while supporting higher automation. The modular, small-footprint design is intended to simplify layout and maintenance in the underground-linked plant and reduce structural steel and concrete demand. For process engineers, the choice signals a push towards fine grinding and high-intensity flotation to maximise metal recovery while tightening water and tailings management.

    Technical Brief

    • Jameson Concentrator selection is tied to Hermosa’s “best-practice critical minerals” design brief in Arizona.
    • Glencore Technology positions the concentrator to support higher inherent process safety in plant layout.
    • Hermosa’s processing plant is being engineered explicitly for “increasingly automated” operation from first production.
    • South32 is targeting reduced environmental impact at Hermosa through flowsheet and equipment choices, not only power sourcing.

    Our Take

    Across our recent South32 items, Hermosa and the Sierra Gorda copper operation appear as the main base‑metals growth platforms, suggesting that deploying Jameson technology at Hermosa could become a reference flowsheet for other South32 critical‑minerals assets if it delivers the expected fine‑grind and recovery performance.

    Within the 112 critical‑minerals‑tagged pieces in our database, few US projects have both FAST‑41 status and a defined processing technology path, so Hermosa’s combination of streamlined permitting and early plant design choices may give it a schedule and cost‑of-capital advantage over other Arizona and wider US base‑metal developments.

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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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