"Critical minerals" is a government-defined category, not a fixed geological one: substances essential to a country's economic or national security, with a supply chain vulnerable to disruption. Copper, lithium, cobalt, nickel, and manganese are the names that come up most. "Rare earths" are a narrower group inside that category — 17 specific elements (neodymium, dysprosium, and others) that go into the magnets powering EV motors, wind turbines, and precision-guided weapons. Every rare earth is a critical mineral. Not every critical mineral is a rare earth.
It isn't the mining. China controls roughly 91% of global rare earth separation and refining capacity, and is the leading refiner of 19 of the 20 most important industrial minerals — 73% of global lithium chemical refining, ~47% of the world's refined copper. The chokepoint sits in separation, refining, alloying, and magnet manufacturing: the value-adding stages above mining, not the digging itself. A country can mine its own lithium and still end up shipping it to China to get it into battery-grade form.
China mines about 8.5% of the world's copper — and still refines 47% of it. The ore comes from somewhere else. Right now, that somewhere else is largely Chile and Peru.
Genuinely both, and it's early. The US is not just writing checks for raw ore. Rio Tinto's $2.5B Rincón lithium project, in Argentina's Puna region, is backed by a $1.175B financing package (IFC, IDB Invest, Japan's JBIC, and Export Finance Australia) targeting battery-grade lithium carbonate and hydroxide — refined chemical product, not brine. Serra Verde's Brazil operation is a mine and a processing plant, financed specifically to end its legacy offtake agreements with Chinese buyers. Chile and Argentina were until recently ineligible for US Development Finance Corporation engagement on income-classification grounds; a DFC reauthorization removed that barrier, and Chile's Aclara Resources is now in talks with the agency to fund the country's first rare-earth mine. In January, Trump signed a Section 232 proclamation threatening tariffs on imports of processed critical minerals unless bilateral deals get negotiated — pressure aimed at the value-add stage, not the ore. The US, EU, and Japan followed with their own framework covering refining and recycling as well as extraction, formalized in an April memorandum of understanding.
Scale check, so this doesn't read as more than it is: China still controls an estimated 40–90% of global processing capacity across lithium, cobalt, and copper, despite mining only about 10% of it. A handful of billion-dollar deals is real progress. It is not close to closing that gap.
And financing is only half the bottleneck. New refining capacity still has to get permitted. Chile's Código de Aguas requires an aquifer-use concession from the DGA before any new mining or processing footprint can draw water, and a full Environmental Impact Study — the review track large mining and processing projects fall under — averaged 1,051 days in 2024, per Chile's own environmental regulator. Capital can close a financing gap in months. It can't close a permitting gap that runs on its own multi-year clock, MOU or not.
The strategic prize was never the ore — it's the refining capacity, and that's where the actual leverage sits. Brazil is the most interesting ground right now: a real, scaled rare-earth processing asset with US capital already moving to take control of it, and no dominant incumbent locking out new entrants. Argentina is the volume play, with RIGI's 30-year stability guarantees and an explicit push toward battery-grade output rather than raw brine exports. Chile is the complicated one: the most US-aligned government in the region, a confirmed ambassador, an FTA renegotiation in progress — and still shipping most of its copper concentrate to Chinese smelters, because that's where the capacity actually exists today. It's also not a blank slate for whoever bids first: Chile's Estrategia Nacional del Litio requires state equity participation and local value-add (cathode active material production, not just refined chemical exports) from any operator, allied or not. That gap between diplomatic alignment and where the processing money actually flows is still the opportunity — it's just a negotiation with a government that has its own industrialization agenda, not an open field.
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