Lithium Argentina produces comes from brine pumped out of salt flats (salares) on the Puna plateau of Salta, Jujuy and Catamarca, then concentrated and processed into lithium carbonate or chloride. The USGS 2026 lithium summary estimates Argentine output at about 23,000 tonnes of lithium in 2025, up from 13,800 in 2024, with reserves of 4.4 million tonnes and measured and indicated resources of 28 million tonnes, the largest resource of any country.

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Those numbers put lithium Argentina firmly among the world’s top producers, and they are moving fast. The USGS made significant revisions to Argentina’s 2024 production based on company reports, counts four brine operations in Argentina among the sources of most world output, and lists Argentina among the countries where significant production capacity expansions took place in 2025. It revises these figures every February, so check the latest edition before quoting them.

“Argentina holds about 28 million tonnes of lithium resources, the largest of any country, the USGS estimates.”

How lithium Argentina brines form

The salares of the Puna fit the closed-basin brine model the USGS sets out in Professional Paper 1802-K. The ingredients are an arid climate, a closed basin with a salt flat, tectonic subsidence, volcanic or geothermal heat, lithium-bearing source rocks such as volcanic ash, aquifers to hold the brine, and time. The USGS places favourable basins between about 19° and 37° latitude, and the Andean salt flats sit squarely inside that band, surrounded by young volcanoes. Our guide to lithium deposit types compares brines with pegmatite and clay deposits.

Argentina’s own geological description, in the national Secretaría de Minería’s catalogue of advanced lithium projects, tells the same story in local terms. The salares began as freshwater lakes in the Pleistocene, became salty early, and dried out in the Holocene, while nearby volcanism moved large quantities of ions into the basins. Almost all the brines carry economically useful elements, especially boron and lithium. The catalogue describes one salar, Centenario Ratones in Salta, at about 3,900 m above sea level and 300 km west of the city of Salta, which gives a sense of the altitude and remoteness of the work.

Grade, area and magnesium

Three numbers separate one salar from another. The first is lithium concentration: the USGS gives the Salar de Atacama in Chile an average of 1,400 ppm, against about 160 ppm at Clayton Valley in Nevada. The second is size: Atacama covers about 2,100 km². The third is chemistry. The USGS explains that Bolivia’s Salar de Uyuni, perhaps the largest accumulation of lithium in the world at around 320 ppm, carries so much dissolved magnesium that it hampers evaporation by pulling lithium out early into magnesium salts. The same balance of lithium, magnesium and sulphate shapes the processing choice for every lithium Argentina project. For the US comparison, our guide to lithium deposits in the United States covers Nevada’s brines and the other US deposit types.

Lithium Argentina output and reserves in numbers

On the latest revised USGS numbers, Argentina mined about 6,590 tonnes of lithium in 2022, 8,630 in 2023, 13,800 in 2024 and 23,000 in 2025. Chile, the older brine producer across the border, went from 38,000 to 56,000 tonnes over the same years. The gap is still wide, but lithium Argentina output grew much faster in percentage terms.

Reserves have grown more slowly than output. The USGS put Argentina’s reserves at 3.6 million tonnes in its 2024 edition, 4.0 million in 2025 and 4.4 million in 2026. Resources, at 28 million tonnes, are more than six times reserves. That is a larger ratio than Chile (9.2 million tonnes of reserves against 13 million of resources) or Australia (8.4 against 10), and it shows how much drilling, pumping tests and study work is still needed to move Argentine brine into the reserve column.

Where the lithium goes

Much of it goes north. The USGS reports that 43% of US lithium imports from 2021 to 2024 came from Argentina and 54% from Chile. The USGS 2022 Minerals Yearbook recorded that a substantial share of South American lithium carbonate was exported to the United States, and that Argentine operations produced lithium carbonate and chloride from brines at the Salar del Hombre Muerto and lithium carbonate from the Salar de Olaroz.

Lithium mining companies in Argentina and their salars

Lithium mining companies in Argentina work in three provinces and a handful of basins. The list below keeps to operations and projects named in USGS or Argentine government sources, with the date of the source; ownership and capacity change, so check each company’s latest filings.

Newer entrants and expansions have followed since those sources were written, which is why the USGS counted four main brine operations and several smaller ones by 2025. For a current view of each salar’s projects and stages, the provincial mining authorities and the national Secretaría de Minería publish updated information.

Lithium Argentina by province

The three lithium provinces share the Puna but differ in detail. The sources cited here place the Salar del Hombre Muerto operation in Catamarca, the Olaroz and Cauchari-Olaroz operations in Jujuy, and the Centenario Ratones project in Salta, and the Secretaría de Minería’s catalogue maps more than a dozen advanced projects spread across the three. Because mineral rights are provincial, each province’s mining authority, royalty terms and community consultation practice apply to the lithium Argentina projects inside its borders.

• Catamarca: the Salar del Hombre Muerto, one of the longest-running Argentine brine operations in the USGS record.
• Jujuy: the Olaroz and Cauchari basins, where two large operations sit close together on the Puna plateau.
• Salta: several salars in the catalogue, including Centenario Ratones at about 3,900 m, 300 km west of the provincial capital.

Evaporation or direct extraction

Most South American brine has been processed by solar evaporation. The USGS describes the method at Clayton Valley, where brine moves through a chain of ponds for nearly two years before it is concentrated enough, about 5,000 ppm, to send to a chemical plant. The high, dry Puna suits that approach. Direct lithium extraction takes lithium out of the brine chemically instead, and a US Department of Energy fact sheet says it needs 99% less water per ton of lithium than current mining processes. Which route suits a lithium Argentina project depends on brine chemistry, water availability, energy and scale, and many studies now test both.

Who grants mining rights for lithium in Argentina

Argentina’s mineral rights are provincial. The Secretaría de Minería’s catalogue reminds readers that mines are private property of the Nation or of the Provinces depending on the territory they sit in, under Articles 124 and 75(12) of the National Constitution and Article 7 of the Mining Code (Law 1919), and that anyone needing the legal, social or environmental status of a project should consult the provincial authorities. In practice, lithium Argentina titles sit with the mining authorities of Salta, Jujuy and Catamarca.

National policy adds a second layer. The Economy Ministry’s RIGI page presents the Large Investment Incentive Regime (Régimen de Incentivo para Grandes Inversiones) as a tool to attract national and foreign investment, and its investment data include lithium projects. Anyone modelling a project should check the current RIGI conditions and each province’s own rules, royalties and community requirements. Our Spanish-language guide to concesiones mineras, petitorios and cateos (en español) explains how exploration and mining titles are structured in the region.

The lithium triangle: Chile, Bolivia and Peru

Argentina shares the high Andes with Chile and Bolivia, the three countries usually called the lithium triangle. On USGS 2026 figures, Argentina has 28 million tonnes of measured and indicated resources, Bolivia 23 million and Chile 13 million. Chile has the largest reserves in the world at 9.2 million tonnes and produced about 56,000 tonnes in 2025, from two brine operations the USGS counts among the main world sources. Bolivia has a giant resource at Uyuni but, as the USGS notes, a magnesium-rich brine that complicates evaporation.

Argentina and Chile compared

The two neighbours make an instructive pair. Chile produced about 56,000 tonnes of lithium in 2025 from two main brine operations counted by the USGS, while Argentina produced about 23,000 tonnes from four. Chile’s reserves of 9.2 million tonnes are about 70% of its 13 million tonnes of resources; Argentina’s 4.4 million tonnes of reserves are about 16% of its 28 million. Put simply, Chile has already converted most of what it knows about into mineable reserves, largely at a single exceptional salar, the Salar de Atacama, where the USGS gives an average grade of 1,400 ppm. Argentina has more lithium spread across more salars and more operators, with much of it still to be drilled out and tested.

For explorers and investors, that difference is the opportunity and the risk. Lithium Argentina growth depends on turning resources into reserves one basin at a time, which takes drilling, long pumping tests, process work and provincial approvals. Numbers from each February edition of the USGS summary are the simplest public way to track whether that conversion is happening.

Lithium in Peru

Lithium in Peru is a different geology. The USGS lists Peru’s measured and indicated resources at 1 million tonnes and includes Peru among countries developing mineral-based, not brine, lithium sources. The Peruvian geological survey, INGEMMET, ran regional lithium prospecting projects in 2018 and 2019 and found lithium values from 100 to 3,070 ppm in southern Peru, against no more than 132 ppm in the centre and north, with the highest values in volcanic rocks related to the salars of the triangle. The same paper discusses the Falchani project in Puno, where uranium drilling by Macusani Yellowcake returned lithium values of 3,500 to 4,000 ppm according to a 2018 industry report it cites.

Lithium in Colombia

Colombia does not appear in the USGS 2026 list of countries with reported lithium resources, nor in its list of countries with brine or mineral lithium sources in development. Colombia’s national geological service would be the place to check for newer work; until then, lithium in Colombia should be treated as an early-stage exploration question.

How lithium exploration works on a salar

Exploring a salar is closer to groundwater work than to hard-rock prospecting. The CIM guidelines set out what a brine resource needs: aquifer geometry, specific yield measured by layer, lithium and other element concentrations, and, for reserves, permeability, transmissivity and a pumping design. A typical lithium Argentina exploration programme runs in this order.

1. Basin screening: confirm a closed basin, map the salt crust, alluvial fans and old shorelines, and identify volcanic source rocks and hot springs.
2. Surface sampling: brine from pits and springs for lithium, magnesium, sulphate, potassium and boron.
3. Geophysics: electrical and electromagnetic surveys map conductive brine and the fresh-water margins; our guide to geophysical surveys in Peru, Colombia and Argentina (en español) covers the methods.
4. Drilling: diamond and rotary holes with depth-specific brine sampling, and core for porosity and specific yield.
5. Pumping tests: long-term tests to measure how much brine the aquifer delivers, and how grade changes as it is pumped.
6. Process tests: evaporation or direct extraction tests on real brine, including magnesium and sulphate removal.

Before you invest in or option a salar property

Salar properties change hands often, and the pitch usually leans on the neighbours. A few questions separate a real lithium Argentina opportunity from a claim that simply borders one.

• Is the title current and provincial? Check the mining cadastre of the province, not a copy of an old certificate.
• How much of the salar does it cover? A claim over alluvial fans at the edge may hold fresh or brackish water rather than brine.
• What was sampled, and how deep? Surface pit samples are a first look; drilled, depth-specific brine samples are what count.
• Has specific yield been measured? Without it, any lithium tonnage is a guess, as the CIM guidelines make clear.
• What is the magnesium-to-lithium ratio? High magnesium, as at Uyuni, makes processing harder.
• ⚠ Who else draws on the basin’s water? Operations, communities and wetlands can all share one aquifer.

Common mistakes with lithium brine data

• Quoting total porosity instead of specific yield, which overstates drainable brine.
• Averaging brine grades across different aquifers separated by clay layers.
• Treating a pumping test of days as proof of decades of supply.
• Ignoring dilution as fresh water moves in from the basin margins during pumping.

Lithium Argentina terms in plain English

Salar

A salt flat in a closed basin. In the Puna, salares hold the lithium-rich brines.

Puna

The high Andean plateau of north-west Argentina, where the lithium salars of Salta, Jujuy and Catamarca sit.

Specific yield

The share of aquifer volume that drains as brine. CIM guidance uses it, not total porosity, for brine resources.

LCE

Lithium carbonate equivalent. One tonne of lithium is about 5.3 t LCE.

RIGI

Argentina’s Large Investment Incentive Regime for major investment projects, including lithium.

Where satellite screening fits

Salars are large, flat and remote, which suits satellite work at the start of a programme. Imagery and elevation data outline the closed basin, the salt crust, alluvial fans, old shorelines, lagoons and volcanic source rocks, and they show how surface water and vegetation change through the seasons. Our satellite-based mineral detection analyses multispectral and hyperspectral data over your area to flag target zones, alteration halos, faults and fractures. For a brine, the result guides where to sample, run geophysics and drill; it does not measure the brine itself, which only drilling and pumping can do.

• Input: coordinates, KML/KMZ or a polygon, plus province and target mineral.
• Output: high-potential zones, prospectivity heatmaps, estimated location and depth ranges, geological interpretation, PDF and GIS files.
• ✔ Time and cost: 5–20 business days; early-exploration timelines cut from months to days and costs lowered by up to 80–85%.
• Premium+: TargetMax™ drilling-angle recommendations and 3D subsurface models.

The most useful moment for a screen is before the first season on a new property, when the choice is where to dig sampling pits and lay out geophysics lines, and again before drilling, when it helps place holes across the brine body and its fresh-water margins. It cannot tell you the specific yield or the lithium grade at depth, and it should never be quoted as if it did. Used that way, it shortens the path to the measurements a Qualified Person will need.

We have scanned 100,000+ hectares for 20+ mineral types across 25+ countries. Draw your property on mining.farmonaut.com (Map Your Mining Site), ask for a scope through the mining query form, or view a sample of satellite-driven 3D mineral prospectivity mapping. Results are exploration targets, not resources.

Frequently asked questions

Reviewed September 2026 against the USGS Mineral Commodity Summaries 2024 to 2026 lithium chapters, USGS Professional Paper 1802-K, the US DOE fact sheet on direct lithium extraction at the Salton Sea, the USGS 2022 Minerals Yearbook for lithium, the Secretaría de Minería catalogue of advanced lithium projects, the Economy Ministry’s RIGI page, INGEMMET’s paper on lithium prospective areas in Peru and CIM’s best-practice guidelines for lithium brines.

Production, reserve and resource figures are USGS estimates revised every February; company and catalogue details are dated as stated and may have changed. Nothing here is investment advice. Satellite targets are exploration targets, not mineral resources, and need sampling and drilling to confirm.