Not especially. Rare-earth elements are relatively abundant in Earth’s crust, but deposits concentrated enough to mine economically are much less common. They come from several kinds of mineral deposits and clays, and the supply chain involves more than simply finding or digging up ore.
What counts as a rare-earth element?
The name refers to a defined group of 17 chemical elements: the 15 lanthanides, plus scandium and yttrium. It does not mean every scarce mineral or metal. The elements also differ in abundance: the U.S. Geological Survey (USGS) gives cerium a crustal abundance of about 60 parts per million, while thulium and lutetium are each about 0.5 parts per million. These are estimates of how much is present in Earth’s crust, not measurements of mineable material.
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The key distinction is between an element’s presence in the crust and a deposit where it is concentrated in a form that can be recovered economically. As the USGS put it in its 2017 overview, “Although REEs are not rare in terms of average crustal abundance, the concentrated deposits of REEs are limited in number.”
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Where rare earths come from
There is no single rare-earth ore. The principal economic sources identified by the USGS include the minerals bastnasite, monazite, and loparite, as well as lateritic ion-adsorption clays. These occur in different geological settings; an occurrence of a rare-earth-bearing mineral is not automatically a mineable deposit.
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Minerals and deposit types
Rare earths can be concentrated in carbonatites and other alkaline igneous rocks, as well as in iron-oxide deposits, iron-oxide-copper-gold deposits, phosphate-rich sedimentary rocks, veins, and placer deposits. Placer deposits form when natural processes concentrate resistant minerals in sediments; monazite and xenotime can occur in them.
Carbonatite-hosted deposits have historically been important sources of light rare earths. Ion-adsorption clays in southern China are a key source of heavy rare earths. Which elements are enriched, how readily they can be recovered, and the costs of mining and processing all affect a deposit’s value.
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Examples of known deposits
The USGS names Mountain Pass in California as a major carbonatite-hosted deposit. It also identifies Bayan Obo in Inner Mongolia and deposits in Sichuan and Anhui, China. These examples illustrate different geological sources; they are not, by themselves, a current ranking of countries by production.
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Why supply is concentrated
Rare-earth elements occur in many places, but commercially useful concentrations are limited. A project’s prospects depend on more than the presence of rare earths: the deposit’s grade, the elements it contains, the ability to recover them, processing costs, and commodity prices all matter. Mining is also only one stage of supply. Separation and refining capacity are distinct parts of the chain, so a country’s mine output alone does not show where all processing takes place.
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The USGS’s Mineral Commodity Summaries 2026 estimates world rare-earth production at 390,000 metric tons in 2025. That figure is estimated production for one year—not the amount of rare earths in the crust, a reserve estimate, or a measure of how much material is readily available to manufacturers. The cited summary does not establish a comparable current country-by-country split across mining, separation, and refining.
Historical figures should not be mistaken for today’s shares. A USGS report published in 2019 says China accounted for approximately 84 percent of world rare-earth production between 2011 and 2017; it also says U.S. production from Mountain Pass provided about 4 percent of world supply during the period described in that report. Neither number is a current production share.
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Does “critical” mean rare?
No. In this context, “critical” concerns the importance of a material and the risk or potential economic consequences of a supply disruption; it is not a synonym for geologically scarce. The USGS’s explanation of its 2025 critical-minerals list describes a supply-chain risk assessment and identifies samarium, lutetium, terbium, dysprosium, gadolinium, and yttrium among the highest-risk commodity chains under its methodology. Rare earths are chemical elements; criticality is assessed individually rather than applying equally to the group.
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A deposit announcement or map showing rare-earth occurrences does not by itself demonstrate a dependable supply. To compare a mine or proposed project, check:
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- Which elements are present: Light and heavy rare earths are not interchangeable descriptions of a deposit’s mix.
- Host and deposit type: The minerals or clays holding the elements affect how they can be recovered.
- Grade and recoverability: The amount present and the share that can be extracted matter more than occurrence alone.
- Processing capacity: Mining, separation, and refining are different stages and should not be conflated.
- Economic and environmental constraints: Costs and practical development conditions help determine whether a resource can become production.
The USGS’s 2019 review of rare-earth deposits in the United States discusses the range of deposit types and the economic factors involved. A geological resource or occurrence should not be described as an economic reserve unless that status is established.
Quick Recap
Sources and further reading
- USGS: Rare Earths Statistics and Information
- USGS: Rare-earth elements, December 19, 2017
- USGS: Mineral Commodity Summaries 2026
- USGS: About the 2025 List of Critical Minerals
- USGS: Rare earth element mineral deposits in the United States, April 11, 2019
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