The lithium in your phone, laptop, or electric vehicle battery comes from one of two main geological sources: mineral-rich rocks mined from the earth or salty underground brines pumped to the surface and evaporated. Australia leads global production at 37% of the world’s supply, followed by Chile at 21% and China at 17%. From there, the raw material goes through chemical refining before it ever reaches a battery factory.
Hard Rock Mining vs. Brine Extraction
Lithium doesn’t exist as a pure metal in nature. It’s locked inside other minerals or dissolved in extremely salty water deep underground. The two dominant extraction methods reflect these two geological realities.
Hard rock mining targets a mineral called spodumene, found in coarse-grained rock formations known as pegmatites. Australia’s massive lithium industry runs almost entirely on spodumene mining, particularly in Western Australia. The process resembles conventional mining: drill, blast, crush, and then heat the ore in a kiln to make the lithium chemically available for extraction. The advantage is speed. A hard rock operation can ramp up production relatively quickly compared to brine.
Brine extraction dominates in South America, especially in Chile and Argentina, where vast salt flats sit atop underground reservoirs of lithium-rich saltwater. Operators pump this brine into shallow evaporation ponds and let the sun do much of the work over 12 to 18 months, gradually concentrating the lithium as water evaporates. The approach is lower cost but painfully slow, and it’s heavily dependent on arid climates with high solar exposure. It also consumes significant water in regions that already have very little. Estimates of water use vary widely, but research from Argentina’s salt flats puts the total water footprint at roughly 50 to 135 cubic meters per ton of lithium carbonate produced, with some analyses suggesting figures as high as 2,000 cubic meters when the full evaporation phase is included.
Top Producing Countries
Global lithium mine production reached about 240,000 tonnes in 2024. The supply is heavily concentrated:
- Australia: 88,000 tonnes (37.1%), almost all from hard rock spodumene mines
- Chile: 49,000 tonnes (20.7%), from the Atacama salt flat brines
- China: 41,000 tonnes (17.3%), a mix of both hard rock and brine
- Zimbabwe: 22,000 tonnes (9.3%), a rapidly growing hard rock producer
- Argentina: 18,000 tonnes (7.6%), from brine operations in its northwest
These five countries account for over 90% of the world’s mined lithium. But the map of where lithium sits in the ground looks quite different from where it’s currently being extracted. Bolivia and Argentina each hold an estimated 23 million tons of lithium resources. Chile holds 11 million tons. The U.S. Geological Survey estimates total global resources at about 115 million tons, with 19 million tons in the United States alone, spread across brines, clay deposits, geothermal fluids, and pegmatites. Much of it remains untapped.
From Raw Material to Battery-Grade Chemical
A battery can’t use raw lithium ore or dried brine directly. The extracted lithium must be refined into one of two chemical forms: lithium carbonate or lithium hydroxide. This refining step is where the supply chain gets even more concentrated than mining. As of 2023, the top three refining countries controlled roughly 96% of global lithium chemical production, with China dominating that stage by a wide margin.
Lithium carbonate has been the standard battery-grade chemical for years and remains widely used. Lithium hydroxide, however, is increasingly preferred for electric vehicle batteries because it breaks down at a lower temperature during cathode manufacturing. This makes the production process more energy efficient and yields batteries with better performance and longer range. The tradeoff is cost: producing lithium hydroxide from brine is more expensive than producing carbonate, though newer processing methods are closing that gap.
Once refined, lithium carbonate or hydroxide is combined with other metals like nickel, manganese, or cobalt (or with iron and phosphate) to form the cathode material, which is the single most expensive component in a lithium-ion battery. The cathode material is coated onto thin metal foils, assembled with other layers, filled with a liquid electrolyte that also contains lithium, and sealed into the final battery cell.
Direct Lithium Extraction: A Faster Alternative
Traditional brine evaporation has serious drawbacks. It takes over a year, wastes large volumes of water, requires huge land areas for ponds, and recovers only a fraction of the available lithium. A newer approach called direct lithium extraction, or DLE, is positioned to change that.
DLE uses chemical or physical methods, such as specialized filters, ion exchange resins, or materials that selectively absorb lithium, to pull lithium directly out of brine without waiting for evaporation. The process takes hours or days instead of months, recovers a higher percentage of lithium from the source fluid, and allows the spent brine to be pumped back underground rather than left to evaporate in open ponds. Some aluminum-based sorbent technologies have already reached full commercial scale.
DLE also opens up lithium sources that evaporation ponds can’t handle. Geothermal brines, for example, are hot, salty fluids brought to the surface at geothermal power plants. The Smackover Formation, a deep geological layer spanning Arkansas, Texas, Louisiana, Mississippi, and Alabama, holds significant lithium-rich brines that could be tapped alongside geothermal energy production. Several projects in the U.S. and elsewhere are working to pair lithium recovery with existing geothermal infrastructure, which would create a domestic lithium supply while generating renewable electricity from the same wells.
Why Supply Concentration Matters
The gap between where lithium is mined and where it’s refined creates a bottleneck. Australia mines more lithium than any other country, but most of that raw spodumene concentrate is shipped to China for chemical processing. This means the country that controls refining has enormous leverage over the battery supply chain, regardless of where the rock or brine originally came from.
The U.S. holds substantial lithium resources, including 1.8 million tons in proven reserves and 19 million tons in broader geological resources. Yet American mines currently produce only a small fraction of global supply. Efforts to build domestic mining and refining capacity are underway, but bringing a new lithium project from discovery to commercial production typically takes many years due to permitting, environmental review, and the sheer complexity of building extraction and processing infrastructure.
Global reserves currently stand at about 30 million tons of lithium that is economically extractable with today’s technology. At 2024 production rates, that represents well over a century of supply. The challenge isn’t running out of lithium. It’s building enough mines, refineries, and processing plants fast enough to match the explosive growth in demand from electric vehicles and grid-scale energy storage.