Lithium Mining Brine Extraction — Lithium, Boron, and Water Depletion in Andean Salar Basins (Evaporation Ponds, Aquifer Drawdown, Indigenous Water Rights) — household safety profile
High riskApproximately 60% of global lithium production comes from brine extraction in the 'Lithium Triangle' — the Salar de Atacama (Chile), Salar de Uyuni (Bolivia), and Salar de Hombre Muerto (Argentina) — where lithium-rich subsurface brines are pumped to massive evaporation ponds spanning tens of square kilometers.
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Approximately 60% of global lithium production comes from brine extraction in the 'Lithium Triangle' — the Salar de Atacama (Chile), Salar de Uyuni (Bolivia), and Salar de Hombre Muerto (Argentina) — where lithium-rich subsurface brines are pumped to massive evaporation ponds spanning tens of square kilometers. The extraction process pumps 500,000-2,000,000 liters of brine per tonne of lithium carbonate equivalent (LCE) produced, with solar evaporation concentrating lithium while releasing boron, magnesium, and potassium to the atmosphere and pond margins. The fundamental environmental concern is water: brine extraction draws down the salar aquifer system, competing directly with freshwater recharge in one of Earth's driest environments (Atacama receives <15 mm rainfall annually). Studies by CORFO and academic researchers have documented 10-30% declines in salar water tables near extraction zones, with cascading effects on flamingo nesting wetlands, bofedal (high-altitude peat wetlands), and Indigenous Atacameno and Lickan Antay community water sources. Boron released from brine processing (100-500 mg/L in raw brine) contaminates surrounding soils and is phytotoxic to native vegetation at >2 mg/L soil concentration. Lithium carbonate dust from drying operations is corrosive to respiratory mucosa and causes skin and eye irritation. The rapid growth of lithium demand for EV batteries — projected 5-fold increase by 2030 — is intensifying extraction pressure on these fragile desert ecosystems with unresolved tensions between decarbonization goals and environmental justice for Indigenous communities.
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