Rosh Pinah SAG mill commissioning: throughput and flowsheet notes for mine engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Rosh Pinah zinc mine in southwestern Namibia has commissioned a new SAG mill that replaces the existing ball mill and is designed to double processing throughput from 700,000 t/y to 1.4 Mt/y while handling progressively harder ore. The SAG mill brings the RP2.0 flowsheet into full operation as an integrated system, tying in the new WF3 underground portal and decline, paste backfill plant, water treatment plant, and an entirely new zinc flotation, thickening and filtration circuit. Appian Capital Advisory, which owns 90% of the operation, reports construction is over 95% complete, on schedule and on budget.
Technical Brief
- New mill installation forms part of entirely new surface infrastructure, replacing the legacy ball mill circuit.
- RP2.0 underground works centre on the WF3 portal and decline, tying new stopes into the upgraded plant.
- Paste backfill plant and water treatment plant are now mechanically integrated with the grinding and flotation circuits.
- An entirely new zinc flotation, thickening and filtration circuit has been constructed alongside the SAG mill upgrade.
- Overall construction progress has surpassed 95%, with Appian reporting schedule and budget adherence to date.
Our Take
Appian Capital Advisory’s 90% interest in the Rosh Pinah zinc-lead mine, combined with its planned $400 million build-out at Namibia’s Omitiomire copper project, signals a deliberate concentration of base-metal exposure in Namibia, which could give it portfolio-level flexibility on sequencing capex and contractor resources across the country.
The RP2.0 expansion at Rosh Pinah sits alongside Namibia’s first paste backfill plant and a new process water treatment plant already covered in our database, suggesting this mine is being positioned as Appian’s technical flagship for modern underground and water-management practices in arid Namib Desert conditions.
Within our 1195 Mining stories and 221 keyword-matched zinc/lead pieces, Rosh Pinah Zinc appears more frequently than most African zinc operators, indicating that this asset is one of the more actively developed and technically upgraded zinc-lead operations in the region rather than a pure maintenance play.
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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