Mining the Ocean: How Seawater Extraction Could Solve the Mineral Crisis
Seawater contains virtually every element on the periodic table — including lithium, magnesium, and rare earths critical to the energy transition. Nordische's integrated Sea Water Mining and Green Hydrogen system extracts these minerals while co-producing clean hydrogen, turning desalination waste into a resource.
The energy transition faces a paradox: the technologies needed to decarbonise the economy — batteries, wind turbines, solar panels — require minerals whose extraction often causes significant environmental damage. Lithium mining consumes 2.2 million litres of water per tonne produced. Cobalt mining in the DRC involves well-documented human rights concerns. Rare earth processing generates radioactive waste.
Seawater contains an estimated 230 billion tonnes of dissolved minerals, including lithium (concentration: 0.17 ppm), magnesium (1,290 ppm), potassium (380 ppm), and trace quantities of virtually every element on the periodic table. The challenge has always been economic — extracting minerals from such dilute concentrations requires enormous energy inputs.
Nordische Energy Systems has developed an integrated Sea Water Mining (SWM) and Green Hydrogen system that fundamentally changes this calculus. The process uses solar-thermal energy to concentrate seawater, then applies selective extraction membranes to separate target minerals. As a co-product, the system electrolyses the remaining brine to produce green hydrogen at the point of use — eliminating transportation costs and creating a zero-waste circular process.
The laboratory-grade prototype has successfully demonstrated extraction of lithium, magnesium, and calcium from seawater samples, with the green hydrogen co-production validated independently. The technology roadmap targets pilot-scale deployment by 2026, with commercial systems designed for integration into existing desalination plants.
For regions dependent on desalination — the Middle East, North Africa, coastal India, and Australia — this technology converts a waste stream (concentrated brine, which is currently dumped back into the ocean causing ecological damage) into a revenue stream. Instead of paying to dispose of brine, operators could sell extracted minerals and hydrogen.
The strategic implications extend further. Nations currently dependent on China for rare earth processing, or on South America for lithium, could develop domestic mineral supply chains from their own coastlines. Energy security and mineral security converge in a single technology platform.