Where does phosphate rock come from?

Phosphate rock is the raw material for nearly all the phosphorus in the food system, and there is no substitute for it. On this page "phosphate rock" means marketable product, meaning ore that has already been washed, screened and floated to a saleable grade, and it is measured by the weight of that product rather than by the phosphorus inside it. In 2025 China mined 110 million tonnes, 44% of the world's 250 million tonnes (USGS MCS). Morocco was second with 36 million tonnes (14%) and United States third with 20 million tonnes (8%), ahead of Russia (5.6%) and Jordan (4.8%). Output changed +5% from the previous year, and 12% of it came from outside the top ten. Only 24 countries mine phosphate rock at all, which is a small number for a commodity every farmer in the world depends on.

The map is drawn by ancient oceans. Where cold, deep water rises against a continental shelf it carries dissolved phosphorus to the surface, feeds a bloom of plankton and fish, and leaves their remains in the sediment below; over millions of years bacteria and pore water concentrate that phosphorus into the mineral apatite. The great phosphorite belts mark those upwelling coasts. A Cretaceous and Paleogene band runs from Morocco and Western Sahara east through Algeria, Tunisia, Egypt, Israel, Jordan, Syria, Saudi Arabia and Iraq. The Miocene Bone Valley lies under central Florida, and further deposits sit under the coastal desert of Peru and the uplands of Yunnan, Guizhou, Hubei and Sichuan in China. A second and much smaller family is igneous: apatite that crystallized inside carbonatite intrusions on the Kola Peninsula in Russia, at Araxá and Catalão in Brazil, and at Phalaborwa in South Africa. A third, now essentially spent, was guano, the droppings of seabirds accumulated on rainless islands, which is how Nauru, Banaba and the Chincha Islands of Peru came to matter far beyond their size.

Reserves and mine output point in different directions here more sharply than for any other mineral. The USGS defines reserves as the part of identified resources that could be extracted economically at the time of the estimate. On that basis world reserves stood at 73 billion tonnes in 2025, of which Morocco held 50 billion tonnes, or 68% (USGS MCS). China (4.7%), Egypt (3.8%), Tunisia (3.4%) and Russia (3.3%) trail a long way behind. Reserves are a snapshot of what is worth digging at the prices and technology of the moment, not a count of what exists in the ground, and the phosphate figure has been revised sharply upward in the past when the Moroccan deposits were re-surveyed.

The mining table and the trade table therefore describe different things. China and the United States mine large tonnages and convert almost all of them into acid and fertilizer inside their own borders, and the United States has been a net importer of rock for years while still mining 8% of world output. Morocco, Jordan, Peru, Egypt and Togo mine rock partly in order to sell it. Most phosphate rock never crosses a border at all; it travels a few kilometers from the pit to an acid plant and leaves the country as fertilizer, if it leaves at all.

In 2024 the largest exporter of phosphate rock (HS 2510) was Morocco, with $1.5 billion, or 29% of the world's $5.3 billion of export value (CEPII BACI). Jordan followed with 20%, then Peru (10%), Egypt (7.6%) and Togo (6.7%). The largest importer was India, taking $1.9 billion, 36% of the world's $5.3 billion of imports, ahead of United States (6.2%) and Netherlands (5.1%). India buys because it has a large fertilizer industry and very little economic rock of its own; the Netherlands and Belgium appear high in the import table because Rotterdam and Antwerp are processing and transshipment points, not because the Low Countries have deposits.

Read together, the two tables show that the rock trade is a residual. China mines close to half the world's rock and sells almost none of it abroad, while the United States, the third-largest miner, is among the largest importers. The entire world trade in rock was worth $5.3 billion in 2024 (CEPII BACI), which is modest next to the trade in the finished fertilizers made from it, because most of the value is added at the moment the rock meets sulfuric acid. Countries that build acid and ammoniation plants next to their mines export fertilizer instead of rock, and their rock exports fall as those plants start up. A shrinking rock trade can therefore mean more phosphate production, not less.

There is no futures exchange for phosphate rock, no clearing house and no daily settlement. The market is a few dozen mining companies selling to a few hundred acid plants, often under relationships that last decades, and the published price is an assessment rather than a record of a trade. Price reporting agencies such as Argus, CRU and Profercy canvass buyers and sellers each week, collect reported deals, bids and offers, and publish a range or a midpoint for each origin and grade; the World Bank averages one of those assessments into the monthly series used here. The number is a considered estimate of where business is being done.

The series charted on this page is Morocco, 70% BPL, FOB Casablanca. In August 2026 it stood at $170/t, up 11% from a year earlier (World Bank Pink Sheet). The record monthly average is $450/t, set in October 2008; adjusted for US consumer prices the real high was $753.8/t in February 1977, during the first great fertilizer boom. The lowest month in a series that begins in 1960 was $11/t in January 1970. Two trade conventions are packed into the label. FOB is short for free on board: the price buys rock loaded onto the ship at the exporting port, and the buyer pays ocean freight, insurance and discharge, so a CFR or CIF quote at the receiving port is the same rock with those costs added. BPL stands for bone phosphate of lime, a nineteenth-century assay unit the trade never abandoned; dividing a BPL grade by about 2.185 converts it to phosphorus pentoxide, so 70% BPL is roughly 32% P2O5.

Most rock moves on contract, not on the spot market. Miners and acid plants sign annual or multi-year supply agreements with volumes fixed and prices reset each quarter against the published assessments, and India negotiates a closely watched annual contract for rock and for phosphoric acid that other buyers treat as a reference point. The invoice is then adjusted for quality: buyers pay by grade, so a tonne of 70% BPL and a tonne of 66% BPL are different goods, and they apply penalties for iron, aluminum and magnesium oxides, which foul an acid plant and are tracked together as the minor element ratio, and for chlorine, organic carbon, cadmium and uranium. Three ambiguities are worth holding in mind. A rock price is not a fertilizer price and turns later than one; a tonne of rock is not a tonne of nutrient; and one origin's FOB number is not a world price, because the freight from Morocco to Brazil and the freight from Jordan to India are different costs entirely.

China mines close to half the world's rock and exports almost none of it, so Beijing's choices work on the market through what it withholds rather than what it sells. Export inspection requirements and informal volume guidance on finished phosphate fertilizers, applied to protect domestic food security and to hold down farm costs, pull Chinese product out of the world market and force buyers in India, Brazil and Southeast Asia toward Morocco, Russia and Saudi Arabia. Because those buyers then need more rock and acid too, a policy aimed at fertilizer reaches back up the chain to rock.

Rock demand is derived demand: nobody wants rock, they want phosphoric acid. Making that acid means dissolving rock in sulfuric acid, and sulfur is a by-product of refining crude oil and sweetening sour natural gas, so its price follows the energy industry rather than agriculture. Ammonia, needed to turn the acid into DAP and MAP, is made from natural gas. When sulfur or gas is expensive, acid plants run slower, cut their rock purchases and let inventories fall, and the rock price softens even if fertilizer demand is unchanged.

India is the largest single buyer of phosphate rock and one of the largest buyers of phosphoric acid, and almost all of that demand is mediated by the state. The Nutrient Based Subsidy fixes a payment per tonne of nutrient, and when world prices rise faster than the subsidy is adjusted, importers stop buying rather than sell at a loss. Purchases then resume in a rush once the rates are revised or the rupee strengthens. The result is a stop-start pattern of Indian tenders that the whole market watches.

Morocco holds most of the world's known reserves and can decide, cargo by cargo, whether to sell rock or to convert it into acid and finished fertilizer at Jorf Lasfar and Safi. Every new granulation line built at home is a tonne of rock that no longer appears in the export table. That decision sets the availability of merchant rock for buyers who have acid plants but no mine, and it means the size of the rock trade reflects Moroccan industrial strategy as much as it reflects world demand for phosphorus.

Not all rock is interchangeable. Sedimentary North African and Middle Eastern rock carries more cadmium than igneous rock from the Kola Peninsula, Brazil or South Africa, and European fertilizer rules cap cadmium in phosphate fertilizers sold in the single market. Uranium, chlorine and organic carbon carry their own penalties. As the easy high-grade seams are worked out, miners must beneficiate harder rock to reach the same grade, which raises energy and water use per tonne and slowly lifts the cost floor under the price.

Rock is a low-value bulk cargo, so freight is a large share of the delivered cost and small changes in rates move the landed price more than they would for a metal. Cargoes from Jordan, Saudi Arabia and Egypt to Europe and to India transit the Red Sea and the Suez Canal, and rerouting around southern Africa adds weeks and cost. Sanctions and payment restrictions on Russian producers, who mine both rock and finished fertilizer, redirect trade flows without changing how much rock exists.

A phosphate project needs a deposit, a beneficiation plant, water in places where water is scarce, a railway or slurry pipeline and a bulk berth, and it takes the better part of a decade from decision to first shipment. Supply therefore cannot answer a price spike quickly, and when new capacity does arrive it tends to arrive in large increments that overshoot. That asymmetry, slow to add and hard to stop once running, is why the phosphate price spends long periods flat and then moves violently.

Lithium iron phosphate cathodes give phosphate a use outside agriculture for the first time in generations. Battery-grade material needs purified phosphoric acid, which is made either by cleaning wet-process acid or through the older thermal route that smelts rock with coke and silica to make elemental phosphorus. This is still small next to fertilizer, but it competes for the cleanest, lowest-impurity rock and for purification capacity, and it links a farm input to the automotive and grid-storage cycle.

Around four fifths of the world's rock comes from sedimentary deposits worked in open pits. In Florida, draglines strip the overburden and dig a matrix of phosphate pebble, quartz sand and clay, which is broken up with water jets and pumped as a slurry to the plant. On the Moroccan plateaus at Khouribga and Benguerir, and in the Jordanian and Saudi deserts, flat-lying seams are uncovered by shovel and truck or by bucket-wheel excavator and hauled out layer by layer. Igneous apatite ore on the Kola Peninsula is mined both open pit and underground; it is harder and lower in grade but very low in cadmium, which is why it commands a premium in Europe.

Raw ore is not saleable. Beneficiation washes out the clay, screens off the coarse pebble, deslimes the fines and then floats the apatite away from silica and carbonate using reagents that make the phosphate particles stick to air bubbles. Some rock is calcined, which is to say roasted, to burn off organic matter and drive carbonate out. What emerges is a concentrate of roughly 29% to 34% P2O5, the marketable product that the USGS and the trade both count. The waste streams are large: sand tailings, and phosphatic clays that take years to settle in engineered impoundments.

From there the rock takes one of two chemical routes. The wet process, which handles the overwhelming majority, digests rock in sulfuric acid to yield phosphoric acid and a mountain of by-product calcium sulfate known as phosphogypsum, roughly five tonnes of it for every tonne of P2O5. Because the gypsum carries the radium that was in the rock, it is stacked rather than sold in most countries. The acid is then neutralized with ammonia to make diammonium and monoammonium phosphate, or reacted with more ground rock to make triple superphosphate. The thermal route is older and rarer: rock, coke and silica are smelted in an electric furnace to distil off elemental phosphorus, which burns to a very pure acid used in food, detergents and battery materials. It is enormously power-hungry and survives mainly in China and Kazakhstan. A small share of rock skips chemistry altogether, because soft, highly reactive rock ground fine can be spread straight onto acid soils, where it dissolves over several seasons.

Phosphate rock is a fertilizer mineral first and almost only. The USGS reports that phosphate rock is consumed primarily to produce phosphoric acid for fertilizers, with the great majority of world output ending up as diammonium phosphate, monoammonium phosphate, triple superphosphate, single superphosphate or compound NPK blends (USGS, Mineral Commodity Summaries). The next largest use is animal feed, where defluorinated dicalcium and monocalcium phosphate supply the phosphorus and calcium that poultry, pigs and cattle need for bone growth. Phosphorus is one of the elements no crop and no animal can do without, and unlike nitrogen it cannot be pulled out of the air.

The remaining few per cent are industrial and split across many small markets. Food-grade phosphoric acid gives cola drinks their sharpness and acts as a leavening acid in baking powder; sodium tripolyphosphate was the workhorse detergent builder until phosphate limits in wastewater rules cut its use in most of the rich world; phosphates go into flame retardants, corrosion inhibitors, metal treatment, water treatment, toothpaste and ceramics. Elemental phosphorus is the starting point for phosphorus trichloride and for glyphosate herbicide, and purified phosphoric acid is the phosphorus source for lithium iron phosphate battery cathodes. Uranium and rare earths are present in most sedimentary rock and are occasionally recovered as by-products when their prices justify the plant.

The defining feature of the phosphate chain is that processing sits on top of the mine. Rock is heavy, dusty and cheap per tonne, so nobody ships it further than they must. Morocco's OCP pumps rock as a water slurry through a pipeline from the Khouribga mines down to the coastal chemical complex at Jorf Lasfar, which removes drying, rail haulage and dust from the route in one step. Florida's mines feed acid plants a short conveyor ride away. Saudi Arabia built an integrated mine, railway and chemical city at Ras Al Khair to move rock from the northern desert to the Gulf coast. Where that integration exists, the country exports fertilizer; where it does not, it exports rock and imports the fertilizer back.

The routes are short and specific. Moroccan rock and acid leave through Jorf Lasfar, Safi and Casablanca, and rock from the Western Sahara deposit at Bou Craa travels by a long overland conveyor to the port of Laayoune. Jordanian rock goes down to Aqaba on the Red Sea, Saudi rock to Ras Al Khair on the Gulf, Peruvian rock from Bayovar, Togolese rock from Lomé and Kola apatite by rail to Murmansk. From those berths it moves in Handysize and Supramax bulk carriers, and cargoes bound from the Gulf and the Red Sea to Europe depend on Bab el-Mandeb and Suez.

The single points of failure are unusual for a mineral because they are political and chemical rather than geological. One country holds most of the world's reserves, so a decision taken in Casablanca changes the options available to farmers everywhere. The legal status of Western Sahara has produced court challenges and at least one detained cargo, which puts a question mark over part of that supply for buyers who care about provenance. Downstream, phosphogypsum stacks are permanent liabilities that can fail, as one did in Florida when a lined reservoir on an old stack had to be drained into Tampa Bay. And because a mine without an acid plant is only half a business, a sulfur shortage or a gas curtailment can idle phosphate capacity as effectively as a mine accident.