Mining in Salta: plant at the salar or plant in Güemes, and what it means for steel

October 19, 2026  ·  Indumor

“On the Puna, if you didn’t bring it, it doesn’t exist.” Anyone who has worked on a Salta salt flat says it: no hardware store around the corner, no shop, no spare part that arrives the same day. Everything needed — a flange, a tank, a stair — has to be planned, fabricated and hauled in from hundreds of kilometers away. And that one line explains one of the most interesting decisions in Salta’s lithium industry: where to put the plant.

Salta, in northwestern Argentina, has one of the country’s most active lithium pipelines, plus a world-scale copper project under study. Rio Tinto is developing Rincón, with a 3,000-tonne-a-year starter plant running since 2025 and a 50,000-tonne plant planned for 2028, in a US$2.5 billion project that was the first mining approval under the RIGI incentive regime. Eramet runs Centenario-Ratones, in Los Andes department, using direct lithium extraction to produce 24,000 tonnes a year of carbonate, and is studying an expansion. Ganfeng produces lithium chloride from the Mariana project on the Salar de Llullaillaco and, with Lithium Argentina, filed the Pozuelos-Pastos Grandes project with the RIGI for up to 150,000 tonnes in three stages. Fortuna produces gold at Lindero by heap leaching. And First Quantum is advancing Taca Taca, a copper project with an estimated initial capex of about US$4.2 billion.

Taca Taca deserves its own paragraph. Its February 2026 technical report points to roughly 209,000 tonnes of copper a year, plus gold and molybdenum; in April it secured its water feasibility certificate, and its environmental impact study was expected in 2026. If it goes ahead, it would be a world-scale copper mine on the Salta Puna, with everything that implies: a concentrator, crushing, grinding, conveyors, hoppers, chutes and a maintenance chain lasting decades. It is the project that could make Salta a copper province as well as a lithium one.

Plant at the salar vs. plant in Güemes

Two models coexist. Rincón and Centenario-Ratones process at the salt flat itself, above 3,700 meters. Mariana and Sal de Oro’s first phase, by contrast, concentrate or evaporate brine on the Puna and process it at the General Güemes Industrial Park, down in the valley, a few dozen kilometers from the city of Salta and at around 700 meters.

	Plant at the salar	Plant in Güemes
Altitude	3,700 to 4,000 m	About 700 m
Erection	Slow, with cold, wind and less oxygen	Industrial, like any park
Brine logistics	Processed where it is extracted	Concentrate must be hauled
What gets fabricated	Everything pre-assembled: modules and skids	More field erection, more conventional steel
Staff and services	Camp, long rotations	City, suppliers nearby

Why would anyone haul concentrated brine hundreds of kilometers instead of processing it at the salar? Because at 700 meters a chemical plant gets built, run and maintained like any other industry, with people sleeping at home and suppliers an hour away. In exchange, a concentrate has to move — and that freight is paid forever. At the salar it is the opposite: no freight, but every task costs more and fabrication has to arrive finished.

Verdict

There is no winning model: there are two ways of buying. For a steel fabricator, a salar plant demands modules, skids and assemblies pre-fitted and tested in the shop, because every hour on the Puna is expensive; a Güemes plant demands more structure and conventional erection, with valley logistics. The shop that can do both has work on both sides. The technical criteria inside a plant are covered in what gets fabricated for a lithium plant, and the neighbor’s map in mining in Catamarca, which shares the Salar del Hombre Muerto with Salta.

The calendar is tight: Rincón’s large plant targets 2028 and construction is already under way, with earthworks, camp expansion and a 33 kV power line; the Centenario-Ratones expansion has its investment decision due by the end of 2027. Fabrication packages get awarded well before that. If you are bidding into a Salta project, Indumor adds plant capacity from Córdoba — write to us this week, in English if you prefer.

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