Ascension Targets Heavy Rare Earths in Volcanic Rock With First Well Planned for 2027

Highlights

• Ascension's process injects a proprietary lixiviant into porous volcanic rock to mobilize rare earth elements without excavation, using geothermal heat to aid recovery.
• The startup has raised £6.2 million and partnered with Kenya's state-owned Geothermal Development Company for geophysical surveys at Kabarak and Menengai prospects.
• A first test well is planned for 2027, which will be the critical step in moving from geological thesis to engineering and economic validation.
• Key unknowns include field-scale REE recovery rates, lixiviant recycling, fluid containment, and the cost of converting recovered geofluid into saleable separated oxides.
• Oxford's From Volcanoes to Green Mining program and a £313,000 Innovate UK feasibility study provide scientific backing, but commercial viability remains unproven.

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Oxford-linked startup Ascension is pursuing a striking idea: recover rare earth elements from porous volcanic rock without excavating the rock itself. Its proposed in situ process, tracked by the Institute of Materials, Minerals and Mining (opens in a new tab) writer Motoaki Sumi, injects a proprietary lixiviant underground, uses favorable subsurface conditions—including geothermal heat—to mobilize metals, then pumps the engineered geofluid to surface for recovery. Ascension (opens in a new tab) says targeted volcanic rocks can be especially rich in scarce heavy rare earths and plans its first well in 2027.

REEx Insight — The Well, Not the Story, Is the Catalyst

There is serious science behind the concept. Oxford's From Volcanoes to Green Mining (opens in a new tab) research program studies magmatic and geothermal systems as potential sources of critical metals, while a £313,000 Innovate UK-backed feasibility project specifically investigated recovering rare earths from Ascension Island volcanic rocks.

But investors should draw a bright line between credible science and demonstrated economics.

The critical unknowns remain substantial: field-scale REE recovery rates; concentrations and distribution of valuable Dy/Tb and other heavy rare earths; lixiviant consumption and recycling; fluid containment; permeability changes during leaching; well productivity; groundwater safeguards; reagent and pumping costs; and ultimately the cost of converting recovered fluid into separated, saleable oxides.

Even “minimal surface impact” does not mean minimal subsurface risk. Maintaining predictable fluid pathways is fundamental to both recovery and environmental performance. Ascension itself acknowledges that geophysics must determine where injected fluids travel and ensure they return to extraction wells.

The 2027 well therefore matters enormously: it begins moving Ascension from an elegant geological thesis toward an engineering and economic test.

Kenya Becomes the Test Bed

Kenya's state-owned Geothermal Development Company (opens in a new tab) has independently confirmed its collaboration with Ascension covering geophysical surveys, subsurface characterization, and critical-mineral exploration. In July, the partners reported analysis underway at the Kabarak and Menengai prospects. Ascension reports £6.2 million raised and a 22-person team. For REEx, this is high-potential, high-technical-risk technology—not yet a rare-earth resource or commercial mine.

REEx Connect

Organization	Contact	Relevance
Ascension	Motoaki Sumi	CEO & Co-founder
University of Oxford	Prof. Jon Blundy	Geology / extraction research
University of Oxford	Prof. Mike Kendall	Geophysics
Geothermal Development Company	Stephen Busienei	Kenya partner
Oxford Science Enterprises	Investment Team	Investor
Innovate UK	Innovation funding team	Public funding

Sources:

1. https://www.iom3.org/resource/ascending-the-critical-path.html (opens in a new tab)