Nifty leaching returns after 17 years: heap rehab and SX–EW notes for engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Cyprium Metals has restarted acid leaching at the Nifty copper complex in Western Australia for the first time since 2009, commissioning existing heaps with acid solution and targeting first copper cathode in the December 2026 quarter. Refurbishment of the site’s solvent extraction and electrowinning (SX–EW) plant is progressing in parallel, enabling a return to on-site cathode production rather than concentrate export. For engineers, the restart centres on rehabilitating legacy heap leach infrastructure and integrating it with an upgraded SX–EW circuit after a 17‑year leach hiatus.
Technical Brief
- Existing Nifty heaps are being reactivated in situ, avoiding new pad construction and associated earthworks.
- Acid irrigation of legacy heaps requires re‑commissioning old piping, pumps and pond containment after long-term idle.
- SX–EW refurbishment must address corrosion, scaling and potential obsolescence in mixers, settlers and EW cells.
- Restarting leach on old heaps implies careful management of residual acid, perched water and variable residual copper grades.
- Long shutdown increases uncertainty in liner integrity, necessitating renewed leak detection and groundwater monitoring.
- Integration of refurbished SX–EW with legacy heaps will require staged ramp-up to validate hydraulic and metallurgical performance.
- For similar brownfield copper projects, re‑using historic heaps can materially reduce capex but elevate hydrogeological risk.
Our Take
The restart of acid leaching at the Nifty copper complex aligns with Cyprium Metals’ November 2025 move to restart cathode operations there, suggesting the company is now executing a staged ramp‑up of the full heap leach–SX‑EW value chain rather than a simple care‑and‑maintenance exit.
With new copper targets identified at Cyprium’s Paterson exploration project in Western Australia, Nifty’s leach restart gives the company a near‑term production or cash‑flow anchor in the same state while it advances more speculative greenfields work.
Copper is one of the more densely covered commodities in our mining database, and Western Australian copper restarts like Nifty typically signal confidence that existing infrastructure and permitting can be leveraged more cheaply than greenfield builds targeting similar December 2026‑type horizons.
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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