Scaling American Magnesium Supply Security
The United States and Europe have not produced magnesium metal at scale domestically for years. China controls 95% of global supply. Magrathea is changing that with the most capital raised and commercial traction of any ex-China magnesium project in decades.
Magrathea and TETRA’s investment builds on Arkansas’ defense industry and ensures our nation’s future is powered by American innovation.
Partnered with leaders in venture capital, government & industry
Magrathea is a technology company founded in California that has developed a new generation of electrolytic process for making clean, secure magnesium metal from seawater and brines. Magnesium supply underpins trillions of dollars of trade and national security is impossible without it. Magrathea has emerged as the category leader in rebuilding Western supply of this defense-critical material.
China controls 95% of global magnesium supply and has used their control position as geopolitical leverage.
The U.S. defense industrial base has zero domestic alternatives.
Until now.
Magnesium Production in 2026
Magnesium is the hidden material layer beneath modern industry.
Aerospace
The Blackhawk contains
400lbs of magnesium
Defense
The F-35 contains 40lbs
of magnesium
Automotive
The Ford F-150 contains
33 lbs of magnesium
Most people do not think about magnesium because they never have to. It disappears into aluminum alloys, aerospace structures, defense platforms, titanium production, and steelmaking. The invisibility of this dependency is exactly what makes it a vulnerability.
Critical minerals are not only a geology problem. They are a process technology problem.
The bottleneck in magnesium supply is not the availability of natural magnesium salts, it’s the processing step: the dehydration of magnesium salt and electrolysis to metal. Every previous attempt to build magnesium capacity outside China failed at this step. Magrathea solved it.
provisional patent applications filed
CapEx and OpEx reduction compared to legacy electrolytic
Traction across Government & Industry
“This is exactly the kind of critical minerals project I believe we need more of: technically differentiated, commercially pulled, strategically relevant, and focused on a material that sits deep enough in the supply chain that most people do not notice it until something breaks.”
Brownfield permitted site for smelter development alongside TETRA assets and benefiting from a robust industrial ecosystem
Funding pilot and Commercial Phase I all the way to commercial-scale technology
including a $10M debt facility for working capital
$10M seed round raised in 2023 backed by global leaders in mining & technology