PLS Group (ASX: PLS) runs Pilgangoora, the world's largest independent hard-rock lithium mine, in Western Australia's Pilbara region. On Friday, the company moved from planning to building, approving a major expansion and unveiling a far bigger Ore Reserve to support it.

PLS Group has signed off on its P2000 project, a new processing plant that will lift spodumene concentrate output to about 2 million tonnes a year. The price tag is roughly A$1.9 billion, paid mostly from cash on hand and earnings from existing production.

A Bigger Plant for a Bigger Orebody

Called Jimmagunya, a Nyamal word for "spring country", the new plant will sit beside the existing Pilgan facility and become PLS's third major processing hub. It is designed to handle far more contact ore (the blend of ore and host rock found at a deposit's edge) than older plants could. Ngungaju, the smaller plant, will be idled and kept as flexible backup capacity. First production is pencilled in toward the end of the decade.

Why the Reserve Jump Matters

Behind the plan sits a 31% rise in contained lithium within the Ore Reserve, compared with the figure in the company's annual report. That matters more than any single production target, because reserves count only what can be mined profitably. Two things drove the increase. Better processing means tens of millions of tonnes once dumped as waste can now be counted as ore. A maiden underground reserve also adds higher-grade material beneath the existing pits. In simple terms, PLS can now show it has the rock to feed a larger plant for a long time.

Returns and Costs Under the Microscope

On the company's numbers, P2000 adds about A$2.7 billion in after-tax value at a long-term price based on analyst consensus. It also pulls average unit operating costs down to roughly A$620 a tonne, helped by moving less waste for each tonne of ore. Those assumptions look cautious next to some forecasters. Benchmark Mineral Intelligence's much higher long-term price would more than double the project's value. A tantalum by-product, increasingly viewed as a critical mineral, adds a smaller revenue stream. Lithium is cyclical, so the cost story matters as much as volume.

Spending Beyond the Plant

Alongside P2000, PLS plans to spend A$600 million to A$650 million on infrastructure. That covers a sealed and upgraded access road to the Great Northern Highway, a new permanent village and a new mine services facility. Bigger road trains on a better road should cut concentrate haulage movements by about a third. The new village will also free existing accommodation for construction crews. Western Australia's government has already committed initial funding for the highway intersection.

Underground Mining Waits in the Wings

A maiden underground reserve sits outside the investment decision. PLS is running a separate feasibility study, and any underground build would need its own approval. Still, combining open-pit and underground mining would stretch Pilgangoora's life beyond 25 years and lift average output further.

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Exploration Upside and Risks

A first deep hole in the Bridge Zone, a stretch between the central and northern areas, hit several pegmatites. A multi-year drilling program is due to begin next year. Not every number grew, though. The headline Mineral Resource was trimmed after a tougher test of what could realistically be mined, even as average grade rose. Risks remain, including construction delivery, remaining environmental approvals for the life-of-mine plan, and the lithium price itself.

What Investors Will Watch Next

Funding looks comfortable, with cash and existing operations covering the build and debt only a possibility later. PLS also reaffirmed its franked-dividend framework. Shares have spent the past year well below their 52-week high of $6.81, so the expansion lands while sentiment is still rebuilding. About half of forecast FY30 volume already has contracted placement, leaving room to sign new customers as the plant nears completion.