Samarium — Structural brief
How the supply chain for this commodity is shaped: where it is mined, where it is processed, and which step is the bottleneck.
At a glance
- Largest producer
- China 70%
- MiningBridge estimate from USGS Mineral Commodity Summaries 2026 totals
- Top 3 producers
- 90%
- share of world output
- Concentration (HHI)
- 5,201
- highly concentrated
- Producing countries
- 7
- 1 supply half
- Export measures
- 0
- USGS compilation, Jan 2026
Key findings
What the evidence shows
Samarium Derived Supply: Geochemical Prill Split from USGS Total REO
World Total Rare Earth Oxide (REO) mine production is 390,000 metric tons (USGS MCS 2026, China 69%). Individual elemental mine production is not reported by USGS. An illustrative MiningBridge estimate derived from USGS MCS 2026 Total REO applied to canonical carbonatite/monazite elemental prill splits (method: geochemical mineral lattice distribution across primary deposits) indicates samarium supply of approximately 6,820 metric tons Sm2O3 equivalent, with China controlling ~70%.
How concentrated supply is
The Herfindahl-Hirschman index over country shares is 5,201 (highly concentrated). The top three producers hold 90%; 1 country supplies half.
In this report
The questions it answers
Supply
Who produces it
Below 1,500 is read as unconcentrated and above 2,500 as highly concentrated (US merger-review bands, used as a reference point).
Full analysis and cited sources
Why samarium is listed
The final 2025 United States List of Critical Minerals names samarium. A listing is a statement by a government that supply of the material is both economically essential and exposed to disruption, and it is what brings the commodity inside the scope of procurement rules, stockpiling programmes and permitting reform. 2025-11-07: Final 2025 List of Critical Minerals.[1]
Where it is counted in the published statistics
The published production tables do not quantify samarium on its own. It is reported inside the rare earth elements group, and that is the figure a supply model can be built from: China accounts for 69.4 percent of group output, the group is highly concentrated with an index of 5,072, and the top three producers hold 89.9 percent[2]. Treating that as the exposure for samarium is an approximation with a known direction of error: separation of the individual elements is more concentrated than mining of the group, not less, because the separation step is where the capital and the chemistry sit. The group figure is therefore a floor on concentration for samarium, not an estimate of it.
What the evidence base does not yet hold
No production series by country is held for samarium, so there is no supply model for it and no concentration index computed from its own output. Filling that would take mine or refinery output by producing country, ownership and capacity at the separation or refining step and a customs heading that carries it without mixing it into a wider class. Until those exist, everything above is what the public record supports, and nothing on this page is estimated to cover the gap. The paid bands are not offered for samarium while that remains true.
Samarium Beneficiation & Cash Flow Simulator
An illustrative model built on typical published cost ranges. Change feed grade and throughput to see how the margin moves.
The model runs in the Workbench: register free to run it 3 times a day.
Contractual Penalty Schedule & Deleterious Limits
Standard commercial deduction guidelines enforced by off-taker smelters and converters for non-compliant impurity concentrations:
Model Cargo Financing, CIF Arbitrage & Letter of Credit
Test physical maritime shipments, demurrage risk, hedging spreads, and working capital cash turns in the Trade Desk.
Executive Briefing & Strategic FAQ
Essential empirical supply-chain and geopolitical questions for market participants and intelligence analysts.
Which countries dominate global mining and refining for Samarium?▼
Global Samarium production is characterized by high geographical concentration in both raw extraction and chemical processing, as documented in MiningBridge's empirical supply-chain models.
What are the critical supply chain bottlenecks and geopolitical risks for Samarium?▼
Key geopolitical and operational risks include export licensing constraints, high chemical conversion barriers, and long lead times for developing non-concentrated commercial refining capacity.
What are the primary commercial uses for Samarium, and can it be substituted?▼
Samarium is essential across energy transition, advanced electronics, and defense systems. While direct substitutes exist in select low-performance applications, replacing Samarium in mission-critical hardware incurs significant metallurgical and cost trade-offs.