Rare Earth Elements in Kenya

Rare earth elements are a group of seventeen metals that underpin modern technology. They are used in permanent magnets for electric vehicle motors and wind turbines, in catalysts, phosphors, lasers, glass polishing and many defence applications. Despite their name, they are not especially rare in the Earth’s crust. What is rare is a deposit concentrated enough, and easy enough to process, to be mined profitably.

Kenya’s best-known rare earth prospect is Mrima Hill in Kwale County, which has moved from a geological curiosity to the centre of an international contest for supply. This article explains the geology of Kenya’s rare earth occurrences, what is known about Mrima Hill, the challenges involved and where other opportunities may lie.

Rare Earths in Brief

The rare earth elements comprise the lanthanides, from lanthanum to lutetium, plus yttrium, and often scandium. They are commonly split into two groups.

• Light rare earth elements, including lanthanum, cerium, praseodymium and neodymium, are more abundant and dominate most deposits. Neodymium and praseodymium are especially valuable because of their use in high-strength magnets.
• Heavy rare earth elements, including dysprosium, terbium and yttrium, are scarcer and more valuable. They are important for high-temperature magnets and certain advanced technologies.

Deposits differ in the proportions of these elements, and the value of a deposit depends heavily on its magnet rare earth content and how easily the minerals can be separated.

Where Rare Earths Occur Geologically

Most economic rare earth deposits fall into a few types.

• Carbonatites and alkaline igneous complexes, rare igneous rocks rich in carbonate minerals and associated with rift settings, are the main source of light rare earths and niobium worldwide. Weathering of carbonatite in tropical climates can further enrich rare earths in a near-surface lateritic zone.
• Ionic adsorption clays, formed by deep weathering of granites in warm, humid climates, hold rare earths on clay surfaces and are an important source of heavy rare earths, notably in southern China, with exploration interest in parts of Africa.
• Heavy mineral sands, where the mineral monazite occurs alongside titanium minerals and zircon.
• Hydrothermal and pegmatite deposits, which are generally smaller.

Kenya’s known prospects are mainly of the carbonatite and weathered-carbonatite type.

Mrima Hill: Geology

Mrima Hill lies in Kwale County on the Kenyan coast, not far from Mombasa. It forms part of the Dzombo–Mrima–Kiruku igneous complex, a Cretaceous alkaline carbonatite intrusion that includes carbonatite, volcanic breccia and fenitised country rock, meaning rock chemically altered by fluids from the intrusion.

The hill is capped by a deeply weathered lateritic zone formed over millions of years of tropical weathering. In such systems, the more soluble carbonate minerals are removed, leaving behind residual enrichment of resistant minerals and elements, including niobium, rare earths, phosphorus, barium and manganese. The main rare earth minerals reported at Mrima Hill include monazite and gorceixite, a barium-aluminium phosphate carrying rare earths. Earlier work on the carbonatite also identified niobium and thorium.

Mrima Hill was discovered by Kenya’s geological survey in the 1930s, and has been studied since the 1950s. Historic drilling and pitting have reported mineralisation to depths of around 150 metres.

The 2026 Tender and Reported Figures

In March 2026 the Ministry of Mining and Blue Economy published a gazette notice inviting companies to bid for rights to develop niobium, rare earth elements and associated minerals at Mrima Hill. News reports describe a 2022 government geological assessment and cite figures of several million tonnes of niobium material and tens of millions of tonnes of rare earth material, with an overall deposit value reported in the tens of billions of United States dollars. A US-backed consortium named Mrima Earth Ltd has been reported to have submitted a proposal that includes processing in Kenya.

Readers should treat headline valuations with considerable caution. Press figures often mix categories, quote contained oxide rather than ore, apply spot prices to material that has not been proven economically recoverable and do not follow the classification of resources under international reporting codes. Until a Competent Person has published an estimate under JORC, NI 43-101 or a similar code, with defined cut-off grades, tonnages by confidence category and assumptions, such figures are better regarded as indications of potential than as established resources. A sound evaluation would also consider metallurgical recoveries, processing costs, product quality, thorium management and the realistic market price for the products that can be sold.

Challenges at Mrima Hill

Protected and culturally significant land. Mrima Hill is reported to be both a gazetted forest reserve and a sacred Kaya forest, important to the Mijikenda and Digo communities. Any development needs a legal and social path that respects both designations, extensive community engagement and credible environmental safeguards. This is a central risk for any bidder.

Metallurgical complexity. Rare earths in lateritic carbonatite profiles are often held in fine-grained phosphate minerals, such as monazite and gorceixite, mixed with iron and manganese oxides. Producing a concentrate and then separating individual rare earth oxides is technically demanding, and recovery depends on mineralogy. Early metallurgical testwork is essential to define a flowsheet.

Thorium and radioactivity. Monazite commonly contains thorium and sometimes uranium. Mining and processing require radiation protection, waste management and regulatory approvals, and thorium-bearing residues must be stored safely.

Processing and markets. China currently dominates rare earth separation and magnet manufacturing, which complicates marketing for new suppliers. A project must secure buyers with specifications, and ideally offtake agreements, while governments are keen to see in-country processing, which requires capital and expertise.

Fiscal and legal terms. Kenya’s Mining Act, 2016 treats niobium and rare earths as strategic minerals, giving the state pre-emption rights and enabling participation arrangements. Bidders must understand state participation, royalty rules, local content requirements and the process for converting rights into a mining licence.

Other Carbonatite and Alkaline Complexes in Kenya

Mrima Hill is not the only carbonatite in Kenya. Several others occur in the western part of the country, associated with Cenozoic volcanism and rifting around the Lake Victoria basin and the Kavirondo Gulf.

• The Homa Mountain complex in Homa Bay County is a carbonatite and alkaline volcanic centre with known carbonatite and associated rocks.
• The Kisingiri complex, which includes Rangwa and Ruri, is a large volcanic centre in southwestern Kenya with carbonatite and nephelinite lavas and intrusions.
• Other alkaline intrusions and volcanic centres in the Rift Valley region may contain carbonatite-related niobium, phosphate or rare earth mineralisation.

These complexes are less explored for rare earths than Mrima Hill, and their potential is largely unproven, though geologically they belong to the right family. Weathered profiles over carbonatite at these sites could host enriched zones, and modern exploration techniques have not been systematically applied to many of them. This makes them candidates for early-stage evaluation, provided that land use, community interests and protected status are properly addressed.

Rare Earths in Coastal Mineral Sands

Kenya’s coastal mineral sands near Kwale have been mined for titanium minerals, with monazite present in the heavy mineral suite in small proportions. In some mineral sands operations globally, monazite can be recovered as a by-product, but it requires separate processing and approvals because of its thorium content. This is a secondary opportunity compared with carbonatite sources.

How Rare Earth Exploration Is Done

Exploration for carbonatite-related rare earths uses a combination of techniques.

• Airborne radiometrics and magnetics. Carbonatites often have distinctive radiometric signatures, particularly thorium and uranium channels, and circular magnetic anomalies.
• Geological mapping and regolith mapping. Identifying weathering profiles, residual horizons and fenitised rocks.
• Geochemistry. Soil and auger sampling for rare earth elements, niobium, phosphorus, barium and strontium, using multi-element methods that report the full rare earth suite.
• Drilling. Auger, RC and core drilling to define the thickness and grade of weathered and fresh mineralisation.
• Mineralogy and metallurgy. Detailed mineralogical studies, such as scanning electron microscopy, identify the host minerals and guide metallurgical testwork. This work is often more important than it appears at first, because two deposits with the same assay grade can have very different recoveries.

Considerations for Investors and Explorers

Anyone considering a rare earth project in Kenya should keep several principles in mind.

1. Demand credible resource estimates. Look for statements prepared by Competent Persons under recognised codes, with transparent assumptions.
2. Focus on magnet rare earths. The proportion of neodymium, praseodymium, dysprosium and terbium largely determines value.
3. Test metallurgy early. Process route, recovery and reagent consumption drive economics.
4. Plan for radioactivity. Include thorium management in cost and permitting.
5. Engage communities and protect heritage. Social licence is a core project risk, not an afterthought.
6. Understand the legal framework. The Mining Act, 2016, strategic mineral provisions and pending amendments will shape terms.
7. Think about the market. Secure access to separation facilities or plan for a credible domestic processing route.

Conclusion

Kenya’s rare earth story centres on Mrima Hill, a carbonatite-related niobium and rare earth system with a long geological record and a high public profile. Its true value will be determined not by headline figures but by drilling, mineralogy, metallurgy, processing, environmental and social outcomes, and sound legal and fiscal arrangements. Beyond Mrima Hill, the carbonatite complexes of western Kenya offer geologically interesting but still largely unexplored opportunities. For explorers and investors, the lesson is to combine strong science with patient, transparent engagement, because in rare earths the distance between a promising hill and a producing mine is measured in both technical difficulty and trust.