What it is
Lithium brines are naturally-occurring subsurface saline waters with dissolved lithium concentrations typically in the range of 100-1,500 mg/L Li (milligrams per litre). Economic brines today are generally above 200-300 mg/L, though the threshold moves with lithium prices and with the efficiency of extraction technology.
The largest lithium brine resources are in the Lithium Triangle — the region spanning parts of Chile (Salar de Atacama, Salar de Maricunga), Argentina (Salar del Hombre Muerto, Olaroz, Rincon, and dozens of others), and Bolivia (Salar de Uyuni, Coipasa). Additional brine resources occur in Nevada (Clayton Valley), China (Qaidam Basin), and Tibet.
Why it matters
Brine operations supply roughly half of global lithium production today, typically at lower operating costs than hard-rock (spodumene) operations once the facility is built. However, the development cycle for a brine project is long — 10+ years from discovery to first production is typical — and the water-intensive traditional extraction process (evaporation ponds) has drawn increasing community and environmental scrutiny.
The shift toward Direct Lithium Extraction (DLE)
Newer DLE technologies process brine through ion-exchange, adsorption, or membrane systems that recover lithium in hours rather than months and return most of the water to the aquifer. DLE is expected to be the dominant extraction method for new brine projects over the next decade, but it places a greater premium on brine-grade consistency — which makes pre-drill concentration mapping particularly valuable for siting DLE pilot plants.