Invest1 distinct publisher3 min readPublished
Drilling since 2018 turned 2.2 million tons at Hombre Muerto into 15 million. POSCO's own production case keeps a fifth of that, and the $60 billion headline is a bet on price.
The Investor · Invest desk
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The sixfold figure covers two different activities. Drilling took the original licence from 2.2 million tons to 13.5 million tons of lithium resources [2]. The other 1.5 million tons was bought, as mining rights over the adjoining Hombre Muerto North flat [3], so a tenth of the headline total arrived by transaction rather than by core sample [7].
Between the resource and the tonnage sits an evaporation business. POSCO holds 287 square kilometres of salt flat [9], of which 8.92 square kilometres are ponds [10], meaning 3.1 percent of the footprint does the concentrating [5]. Brine comes up from as deep as 600 metres [6] at an average 921 milligrams of lithium per litre and leaves the pond circuit near 4,000 [5][11], a factor of 4.3 [4] paid for with sunlight and roughly a month of dwell time in each pond [11]. Grade is the one advantage here that does not need capital: at 921 milligrams, reported as the strongest among Argentina's existing flats [5], every cubic metre pumped and every hectare of pond carries more lithium than a lower-grade neighbour's would.
The two plants buy that concentration on different terms. The first runs POSCO's own electrodialysis process, which recovers and reuses phosphoric and sulfuric acid and consumes little caustic soda [14], making lithium phosphate at the flat and converting it to hydroxide down in Guemes [12]. The second, adapted from a commercialised chemical route and now finishing trial operation [15], adds no subsidiary raw materials at all, and pays for that with nine months in the ponds against the first plant's three to four [16][11], which is two to three times as much brine sitting in inventory before anything ships [8]. Its carbonate feeds a new downstream plant at Yulchon in South Jeolla [17]. One line pays in reagents, the other in working capital and evaporation area.
The $60 billion in the Seoul Economic Daily account is 3 million tons multiplied by $20,000 a ton [8][7], which values brine still underground at the spot price of a finished chemical. Spread across the 70 million vehicles the same passage credits to that output [7], the projection works out to about 43 kilograms of lithium per car [3]. The kilograms are set by the ponds. The dollars are not.
The fiscal side is easier to size, and smaller than it sounds. Final approval under Argentina's incentive regime for large investments is described as worth more than $900 million in tax benefits over 30 years, including corporate tax cuts [19], which averages about $30 million a year [6]. Whether that is decisive depends on capital cost and annual output, and the account supplies neither. That is the distance between a resource statement and an investable one, and it is the part a buyer of Korean cathode material still has to fill in.
Ranked by verification strength, evidence, and original report placement.
POSCO Holdings first acquired the mining rights to the Hombre Muerto salt flat in Argentina in 2018.
Continued exploration secured 13.5 million tons of lithium resources at Hombre Muerto, six times the initial estimated reserves of 2.2 million tons.
The additional purchase of mining rights to the Hombre Muerto North salt flat added another 1.5 million tons.
Reserves at Hombre Muerto are estimated at 15 million tons on a lithium carbonate basis.
The Hombre Muerto salt flat holds an average of 921 milligrams of dissolved lithium per litre, the highest concentration among Argentina's existing salt flats.
Deposits of highly concentrated lithium brine lie as deep as 600 metres underground at the flat, which sits at 4,000 metres above sea level in the Andean foothills of Salta.
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Evidence-backed comparisons of source perspectives and observed adoption signals. Read the methodology
Which Builder, Operator, and Investor concerns the observed source mix emphasized—not a truth score.
Evidence, demonstrated adoption, hype gap, incentives, and confidence are assessed independently, each on its own current evidence. How these are measured.
First-hand site access, company-supplied numbers
The reporting rests on direct observation of the site and plants, which grounds the physical and process details well, but every quantitative claim — reserve tonnage, grade, production case, valuation, incentive value — comes from POSCO via a single publisher with no third-party reserve classification, audit, or independent measurement cited.
One plant running, second in final trials, no output disclosed
There is real physical deployment — an operating first plant with upstream and downstream steps, three completed pond strings, a second plant in final trial operation ahead of October completion, and a granted regulatory incentive — but no production volumes, shipments, offtake agreements or customer qualifications are disclosed, and the capacity path to 100,000 tons runs to 2033.
Headline tonnage and dollar figure outrun the disclosed plan
The framing leads with 15 million tons and $60 billion, while the company's own case retains about 3 million tons and the dollar figure is an explicit simple multiplication of projected tonnage by a spot price of $20,000 per ton, with no cost, timing, discounting or price sensitivity. Physical progress is genuine, which keeps the gap moderate rather than extreme.
Company-granted access on a state-promoted project
The article is built on POSCO's first media showing of its second plant, published weeks after a presidential summit that the Korean head of state promoted by name on social media, and centres a state incentive package worth more than $900 million to the company. Every party in the story — miner, host government offering RIGI relief, and visiting government — benefits from an expansive framing, and no adversarial source is present.
Solid on physical facts, thin on numbers
Confidence is moderate: observable plant and pond details are reported first-hand and are internally consistent, but the load-bearing reserve, production and valuation figures are single-sourced from an interested party with no corroboration or independent classification available in the cluster.
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1 article · August 24, 2026