Cyprium Metals (ASX:CYM) takes first acid delivery at Nifty in 20 years

The Phase 1 restart just shifted from construction to commissioning, and the timeline to first cathode tightens.

Cyprium Metals (ASX:CYM) has just hit a milestone that sounds small on paper but matters more than any glossy slide. Sulphuric acid is back on site at the Nifty Copper Complex in Western Australia for the first time since 2006. For a project whose entire Phase 1 thesis hinges on heap leaching and electrowinning, the resumption of acid supply is the practical signal that Nifty is finally close to running again.

Today’s operations update walks through the full restart program, and the language has clearly shifted. The work packages are no longer about refurbishment and construction. They are about pre-commissioning, hydrotesting, regulatory sign-off and operational readiness. Executive Chairman Matt Fifield put it bluntly when he said the team is transitioning from building to completing.

That is the kind of phrase investors in restart stories wait years to hear. The question now is whether the remaining commissioning steps land on schedule, and what the growth program flagged for the September quarter actually contains. Both will shape how the market values this name through the second half of 2026.

Why the first acid truck is the real headline

Acid is the lifeblood of an SXEW operation. Without a working acid storage and distribution terminal, the heap leach pads cannot be irrigated, the pregnant leach solution cannot be generated, and the electrowinning cells have nothing to plate.

Cyprium has solved that bottleneck. The new acid terminal is commissioned, regulatory sign-off has come through, and supply is now flowing from one of Australia’s largest sulphuric acid handlers via Port Hedland. The supplier’s terminal holds up to five months of forecast requirements, which gives Cyprium a meaningful logistics buffer as it ramps.

That is a quiet but important de-risking step. Acid logistics have killed more than one restart in the Pilbara, and Cyprium has now put the supply chain on the board before first cathode.

The injection leach trial is the line item to watch

Buried in the heap leach update is a detail worth flagging. Cyprium has started a direct injection leach trial alongside the conventional turnover and surface drip method assumed in the 2024 Nifty PFS.

The trial involves drilling shallow wells into the heaps and injecting acid solution vertically rather than running it from the top. Initial indications are described as promising, with the wellfield already flushed with water. We think this is more strategically important than the announcement makes it sound.

If injection leaching works at scale, Cyprium can put more material under leach without expanding the surface footprint of the pads. That feeds directly into the bigger growth question, which is whether the SXEW plant can ramp from the targeted 6,000 tpa Phase 1 capacity towards the flagged 20,000 tpa expansion case.

What the September quarter has to deliver

Management has been clear that the growth program updates land in the September quarter. The three threads are SXEW capacity expansion, the shallow oxide material in the open pit, and refurbishment plans for the existing sulphide concentrator.

Updated Mineral Resources and Ore Reserves estimates are expected in the second half of 2026. That sequencing matters because the oxide pit material was originally treated as waste in the 2024 PFS. Bringing it into the leach feed would change the unit economics of the expansion case rather than just the production profile.

The skeptical read is that restart juniors often pile up growth narratives to keep the story fresh while commissioning slips. Cyprium will need to deliver first cathode before the market gives full credit to the 20,000 tpa case.

The Investors Takeaway for Cyprium Metals

The setup for the next six months is unusually clear. Acid is on site, the EW cells are installed, the SX tanks are recertified, and the pond infrastructure is days away from energising. Practical completion is now a question of finishing the punch list and clearing regulatory sign-offs rather than building new things.

If Cyprium hits first cathode in the second half of 2026 and the September quarter brings a credible expansion pathway with updated resources behind it, this stock is being valued as a developer when it is about to become a producer. That gap is where the re-rating lives. Investors looking for more ASX copper restart coverage can browse our recent work at stocksdownunder.