Briefing · Critical Minerals · 12 Oct 2026 · 11 min read

Critical Mineral Feedstock Sourcing

Critical mineral feedstock sourcing explained: ore, concentrate, and by-product supply for lithium, cobalt, nickel, graphite, and rare earths.

Related briefings: the critical minerals supply chain, from this feedstock through to processing, and critical materials components, where refined material becomes a part.

Feedstock Is a Specification, Not a Deposit

A resource estimate is not a feedstock. Critical mineral feedstock sourcing starts one step after geology: with the physical product a refinery, a chemical plant, or a separator is willing to take. That product is usually a concentrate, a brine, an intermediate salt, or a by-product stream. It has a grade, a set of impurities, a moisture content, and a contract. Run-of-mine rock almost never qualifies.

This distinction is why a country can appear on a mining map and still be absent from the supply of the material a factory buys. The critical minerals supply chain briefing maps the full path from crushed rock to finished parts, and locates the tightest geographic concentration in processing. This briefing stays on the upstream side of that path: what the feedstock actually is, which mines and by-product circuits produce it, and which sourcing decisions are available before a tonne ever reaches a refinery.

The IEA's Global Critical Minerals Outlook 2025 treats copper, lithium, nickel, cobalt, graphite, and rare earth elements as the key energy minerals. Those six are the feedstock families below. Gallium and germanium are included because they enter electronics as by-products, not as mines in their own right. What those materials become, once refined, is covered in critical materials components.

Three Products Leave the Upstream

Ore is mineralized rock at the grade the deposit happens to have. It is bulky, and the valuable mineral is often a few percent of the mass or less. Shipping it any distance is rarely rational.

Concentrate is ore that has been crushed and upgraded by physical means: gravity, flotation, magnetic separation, or dense-media separation. Spodumene concentrate, nickel concentrate, copper concentrate carrying cobalt, and rare earth mineral concentrate are all this kind of product. The valuable mineral is now a large enough share of the shipment that a chemical plant on another continent can be the customer. The impurities that flotation did not reject travel with it. Those impurities, not the headline grade, decide which refinery will accept the parcel.

A refined material is something else again. Lithium hydroxide, cobalt sulphate, separated neodymium-praseodymium oxide, and battery-grade graphite are chemical or metallurgical products. They are the inputs to a component. They are not feedstock in the mining sense, and a sourcing plan that stops at the mine gate has not bought them.

The 2024 price record shows the layers do not move together. The IEA notes that lithium spodumene concentrate prices stayed broadly stable through 2024, while lithium chemical prices continued to fall, and that lithium chemical prices were down by more than 80 percent from 2023. A buyer who treats "the lithium price" as one number is mixing a feedstock market with a chemical market. How those layers clear is set out in the supply-chain market section of the critical minerals supply chain briefing.

By-Product Feedstock Does Not Follow Its Own Price

Some critical minerals are the reason the mine exists. Many are not. Across a wider set of strategic minerals, the IEA finds that around half are produced as by-products. A by-product leaves a circuit because the operator is paid mainly for something else. Its output rises and falls with the host metal, not with its own deficit.

That structure shows up in the energy minerals and in the electronics metals beside them. Most cobalt is recovered as a by-product of copper or nickel mining, which is why the Democratic Republic of the Congo can dominate cobalt mine output, at roughly 70 percent, without cobalt being the product the mines were built to sell. Gallium is recovered mainly during alumina refining from bauxite. Germanium is recovered mainly during zinc processing. In each case the host industry sets the volume, and the critical mineral is a specification on a side stream.

By-product sourcing has a practical consequence. A higher cobalt price does not, by itself, bring a new cobalt mine. It changes the attention paid to a stream that copper production already creates, and it changes the economics of recovering that stream rather than leaving it in a tailings pond or a slag. The same is true of gallium and alumina. Feedstock security for these materials is a recovery-circuit question as much as a discovery question. The U.S. Geological Survey's commodity summaries for cobalt, gallium, and germanium are the reference descriptions of those circuits.

Lithium Feedstock: Spodumene and Brine

Commercial lithium feedstock comes from two rocks and one water. Hard-rock mines produce spodumene, a lithium aluminum silicate, and sell it as a concentrate. Australia is the center of that trade. Brine operations pump lithium-bearing groundwater from salt flats and evaporate it, or treat it in a direct-extraction plant, toward a lithium salt. Chile and Argentina are the established brine producers, alongside production in China. The USGS lithium summary tracks both routes.

Neither product is a cathode input. Spodumene concentrate still has to be calcined and chemically converted to lithium carbonate or lithium hydroxide. Brine still has to be purified to a battery specification. That conversion step is where concentration reappears. The IEA's project review expects China to supply more than 60 percent of refined lithium in 2035, even where the concentrate was mined elsewhere. Between 2020 and 2024, China accounted for approximately 70 to 80 percent of refined supply growth in copper and lithium.

Sourcing lithium feedstock is therefore a paired contract. One contract covers the concentrate or the brine project. The second covers conversion capacity, its qualification with a cathode maker, and the hydroxide-versus-carbonate split the buyer actually needs. A tonne of spodumene without a conversion slot is inventory, not a battery supply.

Lithium was the mining exception in an otherwise tighter map. The IEA records that the average share of the top three mining countries across key energy minerals rose from 73 percent in 2020 to 77 percent in 2024, but a large part of lithium's supply growth came from newer producers, including Argentina and Zimbabwe. Feedstock geography for lithium can still move. Refining geography has moved less.

Nickel and Cobalt Feedstock

Nickel feedstock splits by ore, and the ore decides the process. Sulfide deposits, historically important in Canada and Russia, produce a concentrate that conventional smelters can take. Laterite deposits, which dominate the growth in Indonesia and the Philippines, do not. Laterite is processed as a whole ore, through pyrometallurgy into nickel pig iron and ferronickel, or through high-pressure acid leaching toward an intermediate that can be refined into nickel sulphate.

Battery supply needs the sulphate route, or an equivalent class of high-purity nickel. Stainless steel can use the pig-iron route. A sourcing plan that counts all mined nickel as battery feedstock will overstate what a cathode plant can buy. Indonesia is the center of the recent surge. The IEA attributes around 90 percent of refined nickel supply growth from 2020 to 2024 to Indonesia, and expects the top three mining countries to supply about 85 percent of nickel in 2035, up from 75 percent in 2024. The USGS nickel summary separates the ore types that sit underneath those totals.

Cobalt feedstock is mostly not a cobalt mine. It is a credit in copper concentrate from the DRC, or in nickel intermediates. Roughly 70 percent of cobalt mine output is Congolese. Refining is a different map. The IEA finds China holds more than three-quarters of refined cobalt, and expects China to supply more than 60 percent of refined cobalt in 2035. Artisanal and small-scale mining remains a material share of DRC output, which puts due diligence, not just tonnes, inside the feedstock specification.

The paired risk is easy to misstate. A cobalt buyer who diversifies mines inside the DRC has diversified operators, not geology. A buyer who finances a nickel sulfide concentrate outside Indonesia has diversified the ore, and still has to place that concentrate in a refinery that makes sulphate. Feedstock sourcing that ignores the refinery slot repeats the error the supply-chain briefing names directly: leverage sits at the refinery, not the mine.

Graphite Feedstock: Flake, Fines, and Synthetic

Graphite feedstock for batteries is two industries. Natural graphite is mined as flake and fines. China is the largest producer; Mozambique, Madagascar, and Brazil are the other established sources the USGS graphite summary follows. Synthetic graphite is made from petroleum coke or coal tar pitch in a high-temperature graphitization furnace. It is an industrial product with a mineral's end use.

An anode plant does not take mine flake as-is. Natural material has to be spheronized, purified, and coated. Synthetic material has to be milled and qualified. The IEA measures battery-grade graphite at that processed layer, and its 2035 outlook still has China at around 80 percent of battery-grade graphite. Nearly all of the recent growth in refined graphite supply came from China. A flake mine outside China is a real diversification of the ore. It is not, by itself, a diversification of anode powder.

The two feedstocks also fail differently. A natural-graphite shock is a mine and a purification shock. A synthetic-graphite shock is an energy, needle-coke, and furnace shock. Buyers who single-source the finished anode powder are exposed to both, and cannot see which one they hold until the specification is split.

Rare Earth Feedstock: Light Minerals and Heavy Clays

Rare earth feedstock is not one ore. Light rare earths, including neodymium and praseodymium, are mined from minerals such as bastnasite and monazite. China accounts for roughly 60 percent of rare earth mine production. Australia, the Mountain Pass operation in California, Brazil, and Vietnam produce meaningful volumes. Monazite often arrives as a heavy-mineral-sands by-product and carries thorium, which makes the concentrate a regulatory object as well as a mineral one.

Heavy rare earths are the scarcer feedstock, and they are the ones high-temperature magnets require. Dysprosium and terbium are recovered chiefly from ion-adsorption clays, not from the same hard-rock mines that supply most neodymium. Clay feedstock is geographically narrow. A sourcing plan written against "rare earth concentrate" in general will cover the light elements in a magnet and miss the heavy elements that keep the magnet stable when it gets hot.

Separation sits behind both. China processes approximately 85 to 90 percent of the world's rare earth elements after mining, whatever the ore's origin, and the IEA's 2035 case still places China near 80 percent of refined rare earths. The feedstock decision and the separation decision are sequential. Mountain Pass can produce concentrate in California and the separated oxides can still be a contracted step somewhere else. The five-to-ten-year timeline for a new separation plant, set out in the supply chain briefing, is the reason a new mine does not shorten the feedstock problem on a political calendar.

What Sourcing Can Change

Critical mineral feedstock sourcing fails when it is written as a list of countries. It holds when it is written as a list of products, each with a host metal, a process route, and a named conversion plant.

Four tests sort a real source from a resource announcement. First, the product has to match the next plant: spodumene concentrate is not hydroxide, laterite ore is not nickel sulphate, flake graphite is not anode powder, and a light rare earth concentrate is not a dysprosium oxide. Second, the volume has to be able to move without the host industry moving, or the buyer has to accept that it cannot. Third, the impurities have to be inside the receiving plant's specification, which is a metallurgical fact, not a headline grade. Fourth, the conversion slot has to exist on the same timetable as the mine. The IEA's finding that refined-supply growth from 2020 to 2024 was overwhelmingly at the incumbent producer, Indonesia for nickel and China for cobalt, graphite, and rare earths, is what that fourth test looks like in the data.

Investment conditions do not excuse a vague plan. Spending on critical mineral projects rose only 5 percent in 2024, down from 14 percent in 2023, and about 2 percent after cost inflation, in the IEA's account. Low chemical prices are a poor signal to build the next conversion plant. Buyers who want feedstock from a new jurisdiction have to bring the offtake, or a public offtake, that the mine's lenders will accept. The European Union's Critical Raw Materials Act and the U.S. Department of Energy's Critical Minerals and Materials Program are both attempts to supply that kind of commitment. They do not change the specification the plant will take.

The map of parts those feedstocks become is in critical materials components. The seaborne geography of oil and gas, which is a different concentration problem, is in choke points of the world.

Questions this briefing answers

What is critical mineral feedstock sourcing?

Critical mineral feedstock sourcing is the work of securing the ore, concentrate, or by-product stream that a refinery can actually process. It is not the same step as mining a deposit, and it is not the same step as buying a finished chemical or a component. Most buyers need a specified concentrate or intermediate, not run-of-mine rock.

What is the difference between ore, concentrate, and a refined critical mineral?

Ore is mineralized rock. Concentrate is ore that has been crushed and physically upgraded so the valuable mineral is a larger share of the mass. A refined critical mineral is a chemical or metal produced after leaching, separation, or other processing. A mine can sell concentrate and still have no say over where that concentrate is turned into a battery chemical or a separated oxide.

Why do by-products matter in critical mineral feedstock sourcing?

A by-product comes out of a mine or a refinery because the operator is producing something else. Most cobalt is recovered with copper or nickel. Gallium is recovered mainly from alumina refining, and germanium mainly from zinc processing. The IEA finds that around half of a wider set of strategic minerals are produced as by-products, so their supply does not respond cleanly to their own price.

Where does lithium feedstock come from?

Commercial lithium feedstock comes mainly from hard-rock spodumene concentrate, led by Australia, and from brines in Chile and Argentina, with additional supply from China. The concentrate or brine is not yet a battery chemical. Conversion to lithium carbonate or lithium hydroxide is a later step, and the IEA still expects China to supply more than 60 percent of refined lithium in 2035.

Where does rare earth feedstock come from?

Light rare earth feedstock is mined from deposits such as bastnasite and monazite. China accounts for roughly 60 percent of rare earth mine production, with meaningful volumes from Australia, the Mountain Pass operation in California, Brazil, and Vietnam. Heavy rare earths used in high-temperature magnets, including dysprosium and terbium, come chiefly from ion-adsorption clays, a much narrower feedstock than the light rare earth mines.

Sources

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