Rare earth elements are found on every continent, but the vast majority of production comes from a handful of countries. China dominates, mining an estimated 240,000 metric tons of rare earth oxides in 2023, which dwarfs every other producer combined. Geologically, these elements concentrate in specific rock types and weathered clays, and they show up in everything from deep mountain deposits to coastal sands.
The Geology Behind Rare Earth Deposits
Rare earth elements don’t form deposits on their own. They concentrate inside certain minerals that crystallize under specific geological conditions. The two most important mineral sources are bastnäsite (a carbonate mineral rich in cerium and lanthanum) and monazite (a phosphate mineral common in heavy mineral sands). A third mineral, xenotime, is a significant source of the heavier, more valuable rare earths like yttrium and dysprosium.
These minerals tend to form in two main geological settings. The first is carbonatites, which are unusual igneous rocks that crystallize from carbon-rich magma originating deep in the Earth’s mantle. Carbonatite-hosted deposits are found worldwide, but only a handful are actively mined: four in China (Bayan Obo, Daluxiang, Maoniuping, and Weishan) and one in the United States (Mountain Pass in California). The second setting is alkaline igneous intrusions, a related family of rocks that often occur alongside carbonatites. Russia’s Lovozero deposit is the only active mine of this type.
A completely different kind of deposit forms at the surface. In tropical and subtropical climates, weathering breaks down granite bedrock over millions of years, and rare earth elements get adsorbed onto clay particles in the soil. These ion-adsorption clays are the world’s dominant source of heavy rare earths, the subset most critical for high-performance magnets. Southern China and Myanmar host the largest known concentrations, and satellite imagery has mapped thousands of extraction sites across both countries.
Which Countries Produce the Most
China’s output is in a category of its own. Its estimated 240,000 metric tons of rare earth oxide production in 2023 accounted for roughly 70% of global mine output. China also holds the world’s largest reserves at 44 million metric tons, and it controls an even larger share of the refining and processing that turns raw ore into usable materials.
The United States is the second-largest producer at an estimated 43,000 metric tons, almost entirely from the Mountain Pass mine in California’s Mojave Desert. That single deposit has one of the highest ore grades in the world, with 7 to 9 percent rare earth concentration. Myanmar (Burma) has rapidly grown into the third-largest producer at roughly 38,000 metric tons, largely from ion-adsorption clay operations near its border with China. Australia follows at about 18,000 metric tons, and Thailand rounds out the top five at around 7,100 metric tons.
Australia’s position is notable for a different reason: it holds estimated reserves of nearly 106 million metric tons, the largest of any country. Much of that sits in deposits that aren’t yet commercially mined.
Key Deposits Around the World
China’s Bayan Obo mine in Inner Mongolia is the single largest rare earth operation on Earth. It’s a massive carbonatite deposit that also produces iron ore, and it has supplied the bulk of the world’s light rare earths (like neodymium and cerium) for decades.
Mountain Pass in California is the only active rare earth mine in the United States. It produces concentrated ore on-site, which is then shipped elsewhere for the complex chemical separation process. The four elements most prized from deposits like this are neodymium, praseodymium, dysprosium, and terbium, all essential for the permanent magnets used in electric vehicles, wind turbines, and military systems.
In early 2023, Sweden’s state-owned mining company LKAB announced the discovery of more than 1 million metric tons of rare earth oxides near Kiruna in the country’s far north. Named the Per Geijer deposit, it’s the largest known rare earth deposit in Europe. The rare earths there occur alongside phosphorus in the mineral apatite within what is primarily an iron ore body, meaning they could potentially be extracted as a byproduct of existing mining. Commercial production is still years away, but the discovery shifted the conversation about European supply independence.
Sources Beyond Traditional Mining
Rare earth elements also exist in places that aren’t conventional mines. Ocean floor sediments in the Clarion-Clipperton Zone of the northeastern Pacific contain significant rare earth concentrations, locked inside calcium phosphate minerals a few dozen centimeters below the seabed surface. These deep-sea deposits remain commercially untapped due to the enormous technical and environmental challenges of mining at those depths.
Recycling is another growing source. Permanent magnets made from neodymium-iron-boron alloys are found in hard drives, electric motors, wind turbines, and consumer electronics. The rare earth content in scrap magnets is actually much higher than in primary ores, making them an attractive target for recovery. Most recycling efforts focus on sintered magnets, which represent the largest share of the market and contain the most concentrated material. Manufacturing waste from magnet factories is already being reclaimed in some facilities, while recovery from end-of-life consumer products is scaling up more slowly.
Monazite-bearing sands along coastlines in India, Brazil, and parts of Africa represent another underutilized source. Monazite is often collected as a byproduct of mining for titanium and zirconium from beach sands, though its natural radioactivity (it contains thorium) complicates processing and disposal.
Why Location Matters So Much
Rare earth elements aren’t actually rare in the Earth’s crust. Cerium, the most abundant, is roughly as common as copper. The problem is that they rarely concentrate in deposits rich enough to mine economically, and the chemical separation process is expensive and environmentally intensive regardless of where the ore comes from.
This is why geography carries so much strategic weight. China built its dominance not just because it has large deposits, but because it invested heavily in the separation and refining infrastructure that other countries avoided for decades due to cost and environmental concerns. Even ore mined at Mountain Pass in California has historically been shipped to China for processing. The result is a supply chain where the raw materials exist in many countries, but the ability to turn them into usable products remains heavily concentrated in one.