Brine vs. hard rock: the two ways to produce lithium
Not all lithium is obtained the same way. The chosen route defines costs, timelines and environmental footprint — and explains Argentina’s competitive edge.
Brine lithium
Beneath the Puna’s salt flats lies groundwater loaded with lithium salts. It is pumped into vast evaporation ponds, where the sun concentrates the brine over months until it yields a liquid fit to process into lithium carbonate. This is the dominant route in Argentina and Chile.
Its big advantage is cost: Argentine brine lithium sits in the industry’s lowest quartile, with cash costs below US$10,000 per tonne. The trade-off is evaporation time and water use in arid zones.
Hard-rock lithium
In Australia — the world’s largest producer — lithium is extracted from minerals such as spodumene, processed into a 6% Li₂O concentrate. It is faster and more predictable, but usually involves higher energy and processing costs.
Most of that concentrate travels to China to be refined into lithium compounds. That is why countries able to turn brine into battery-grade carbonate — like Argentina — hold a structural cost advantage.