Guide

Iron ore prices explained

Every skyscraper rebar bundle, ship hull, and wind-turbine tower starts as iron ore melted in a blast furnace. Roughly 1.5 billion metric tonnes of seaborne ore move annually from mines in Australia and Brazil to steel mills — overwhelmingly in China. Headline quotes reference Platts IODEX 62% Fe CFR China: dollars per dry metric tonne for medium-grade fines delivered to Chinese ports. Unlike exchange-traded copper on the LME, iron ore’s global benchmark is an assessed index from physical trades, supplemented by Dalian Commodity Exchange (DCE) futures for onshore hedging. This guide explains how iron ore is priced, what drives Pilbara and Vale supply, the blast-furnace link to housing and infrastructure steel demand, grade spreads and freight, macro and inventory signals, how to access exposure, a Harbor Industrial monthly read worked example, an indicator decision table, common pitfalls, and a practitioner checklist alongside our commodities investing guide.

How iron ore prices are quoted

Iron ore is not one homogeneous product. Miners ship fines (powder), lumps (coarser particles), and pellets (agglomerated feed) at varying iron (Fe) content and impurity levels. The industry’s reference price is S&P Global Commodity Insights Platts IODEX for 62% Fe fines, CFR (cost and freight) Qingdao or other major Chinese ports.

Key benchmarks and grade spreads

Platts IODEX 62% Fe CFR China — the global seaborne reference; published daily from normalized physical trade data.
Platts 65% Fe and 58% Fe indices — premium high-grade and discount low-grade benchmarks; the 62–65 spread reflects blast-furnace efficiency economics.
DCE iron ore futures — Dalian-listed contract in yuan per tonne; most liquid onshore hedge for Chinese mills and traders; often leads spot during policy shocks.
SGX TSI 62% Fe CFR China futures — Singapore exchange contract settled against Platts; offshore hedging tool for producers and banks.
Regional premia and penalties — silica, alumina, and phosphorus impurities trigger price penalties; moisture content affects dry-tonne conversions on loading.
Freight component — CFR includes Capesize shipping from Australia or Brazil; freight spikes can widen CFR even when FOB mine prices are flat.

Because the benchmark is assessed rather than exchange-cleared, sudden liquidity gaps can make IODEX sticky during holidays or trade disputes. See our futures contracts guide for margin, roll yield, and calendar-spread mechanics on DCE and SGX.

Supply: Pilbara, Carajás, and the seaborne market

Seaborne iron ore is among the most concentrated commodity markets. Australia (BHP, Rio Tinto, Fortescue in the Pilbara) and Brazil (Vale in the Carajás and southern systems) supply roughly 75% of internationally traded tonnes. China produces substantial domestic ore, but grades are low and mines are high-cost; mills import to blend with local material.

Primary supply levers

Major miner output guidance — quarterly production reports from BHP, Rio, Vale, and FMG set the baseline; even 5–10 million tonne guidance revisions move sentiment.
Australian weather disruptions — Pilbara cyclone season (November–April) can halt port loading; rail flooding affects mine-to-port logistics.
Brazil operational and regulatory risk — Vale tailings-dam reforms after Brumadinho (2019) constrained output for years; licensing delays and heavy rains in Minas Gerais still disrupt southern system shipments.
Simandou (Guinea) greenfield — one of the largest untapped deposits; first tonnes expected mid-decade; long-run supply addition but near-term price impact is narrative-driven.
India export policy — periodic export duties or bans on low-grade fines redirect tonnes domestically or to seaborne markets depending on policy cycle.
Freight and demurrage — Capesize rates from Brazil to China are structurally higher than Australia–China; freight tightness raises CFR faster for Vale cargoes.

Unlike tin, where a single policy headline can remove thousands of tonnes overnight, iron ore supply adjusts through scheduled mine expansions and debottlenecking. The market’s size (~1.5 billion tonnes seaborne) dampens single-mine shocks but amplifies synchronized weather or guidance cuts across majors.

Demand: blast furnaces, steel mills, and China

Iron ore demand is derived entirely from steel production. Roughly 70% of global steel is made via blast furnace–basic oxygen furnace (BF-BOF) routes that consume iron ore, coke, and sinter. Electric arc furnaces (EAFs) melt scrap and direct-reduced iron (DRI), bypassing most seaborne ore. China produces more than half the world’s steel; its property sector, infrastructure stimulus, and export steel volumes dominate iron ore demand swings.

Demand drivers to watch

China crude steel output — National Bureau of Statistics monthly production; year-over-year changes correlate with IODEX within weeks.
Property and construction — new housing starts, cement output, and rebar futures on the Shanghai Futures Exchange signal structural steel demand; property downturns have historically crushed iron ore from triple-digit dollars toward $80–$90/tonne.
Infrastructure stimulus — rail, bridge, and grid spending offsets property weakness; watch NDRC project approvals and local government special bond issuance.
Mill profitability (steel margins) — when rebar-HR coil spreads compress, mills cut output and delay ore restocking even if port inventories are low.
Blast-furnace vs EAF share — rising scrap availability and DRI/HBI capacity in China and Europe structurally cap long-run ore intensity per tonne of steel.
Rest-of-world steel — India’s steel buildout adds incremental ore demand; EU and U.S. mills are smaller marginal buyers of seaborne tonnes.

Iron ore correlates with global industrial activity and GDP, but with a heavier China construction weighting than aluminum. A copper rally on electrification does not lift iron ore if Chinese property steel demand is contracting.

Macro, inventories, and grade-spread signals

Iron ore trades in dollars. A stronger U.S. dollar index (DXY) pressures CFR prices for Chinese buyers, though yuan moves partially offset. China adds a policy layer: steel output caps, pollution curbs during winter heating season, and property-sector credit controls can suppress demand faster than mine supply adjusts.

China port inventories — tracked weekly by Mysteel and other data providers; stocks above 140 million tonnes often signal comfortable mill coverage; draws below 110 million can tighten spot.
Steel mill iron ore stocks — days-of-use at mills; restocking cycles ahead of Lunar New Year or post-winter curbs move spot independently of port totals.
62–65% Fe spread — widening premium signals mills optimizing blast-furnace productivity; narrowing spread suggests margin pressure or low-grade substitution.
Rebar and hot-rolled coil futures — SHFE steel contracts lead physical restocking decisions; falling steel prices with flat ore = margin squeeze.
Capesize freight (Baltic 5TC) — Brazil routes are freight-sensitive; spikes can lift CFR while FOB is unchanged.
China PMI and credit data — official and Caixin manufacturing PMIs below 50 coincide with softer steel output; TSF and new yuan loans signal property liquidity.

In 2021, IODEX peaked above $230/tonne as post-pandemic stimulus and constrained Brazilian supply collided with aggressive Chinese steel output. The 2022–2024 property downturn pulled prices toward $100–$120/tonne despite resilient infrastructure steel — a reminder that iron ore is a China construction and policy story first, a global growth story second.

How to get exposure: futures, miners, ETFs

Vehicle	What you own	Pros	Cons
DCE / SGX iron ore futures	Contract for future delivery	Direct price exposure, mill hedging	China access rules, margin, roll costs
Major miner equities (BHP, Rio, Vale, FMG)	Shares in ore producers	Operational leverage, dividends	Diversified revenue, FX, capex cycles
Steel equities (ArcelorMittal, Nucor)	Downstream steel exposure	Margin story when ore falls	Inverse ore beta; different drivers
Broad commodities funds (PDBC, DBC)	Basket including industrial metals	Inflation sleeve	Minimal pure iron ore weight
Physical ore	Not practical for retail	N/A	Storage, blending, illiquidity

Most portfolio investors access iron ore through diversified miners (BHP and Rio derive large revenue shares from Pilbara iron ore) or a commodities sleeve rather than a pure ore bet. Pure-play iron ore miners are concentrated in Australia and Brazil with significant single-jurisdiction risk. See commodities investing for sizing.

Worked example: Harbor Industrial monthly iron ore read

Harbor Industrial’s materials desk publishes a one-page iron ore monitor for clients with steel supply-chain and construction exposure. The June 2026 template:

Price check — Platts IODEX 62% Fe CFR China $108.40/dmt; 4-week range $104.20–$112.80; off March highs near $118 on softer rebar and inventory builds.
Grade spreads — 65% Fe premium $14.20/dmt (stable); 58% Fe discount $18.50/dmt; mills favor mid-grade blend as margins compress.
Port inventories — China major ports 132.4 Mt (+2.1 Mt w/w); above 130 Mt comfort band; restocking appetite muted.
Mill stocks — average 18.2 days of use (−0.3 d/w); pre-summer maintenance draws normal.
Supply signals — Rio Q2 guidance unchanged at 323–336 Mt; Vale northern system shipments +3% m/m; no Pilbara cyclone disruptions.
Steel demand — China crude steel output −1.8% y/y m/m; property new starts −12% y/y; infrastructure fixed-asset investment +6.4% y/y.
Freight — Capesize Brazil–China $24.80/t (−8% w/w); Australia–China $11.20/t; freight easing supports CFR.
Verdict — neutral to slightly bearish near-term: port stocks elevated, property drag persists, infrastructure offset insufficient for restocking rally; add tactical long below $100 if port stocks fall below 125 Mt with stable steel output; trim above $115 without supply disruption.

The read uses free public data (Platts daily assessments, Mysteel port stocks, major miner quarterly reports, NBS steel output). Pre-written thresholds prevent overreacting to single-shipment delays in a market this large.

Indicator decision table

Question	Best signal	Why
Is seaborne ore tight?	China port inventory trend	Weekly stocks are the fastest visible supply/demand balance.
Will mills restock?	Mill days-of-use, steel margins	Restocking needs profitability, not just low stocks.
China steel demand pulse?	Crude steel output, rebar futures	Ore is derived demand; steel leads ore by weeks.
Property vs infrastructure?	Housing starts, cement output, FAI	Property weakness has dominated 2022–2024 cycles.
Major supply shift?	BHP/Rio/Vale quarterly guidance	Three miners set marginal seaborne tonnes.
Grade preference?	62–65% Fe spread	Widening premium signals blast-furnace efficiency push.
Freight shock?	Baltic Capesize indices	Brazil CFR more freight-sensitive than Australia.
Policy risk?	Steel output cap headlines, winter curbs	Beijing can suppress demand faster than mines cut supply.

Common pitfalls

Treating iron ore like copper for electrification trades — ore is construction steel, not wiring and grid cable.
Ignoring China property cycles — infrastructure stimulus rarely fully offsets a property downturn.
Confusing miner revenue with pure ore beta — BHP and Rio also produce copper, coal, and aluminum.
Using LME mental models — IODEX is assessed; liquidity gaps can make spot sticky.
Overweighting Simandou narratives — greenfield supply takes years to affect balances materially.
Missing freight in CFR moves — FOB flat with rising freight still lifts Chinese import costs.
Equating port stocks with tightness — high stocks with weak steel margins still pressure price.
Mixing unit quotes — IODEX is $/dmt (dry metric tonne); wet tonnes at loading differ; convert before comparing.

Practitioner checklist

Chart Platts IODEX 62% Fe CFR China with consistent $/dmt units.
Track 62–65% Fe spread weekly for grade-demand signals.
Download Mysteel (or equivalent) China port inventory data every Friday.
Plot China crude steel output against IODEX with 2–4 week lag tests.
Monitor BHP, Rio, Vale, and FMG quarterly production and guidance.
Follow SHFE rebar futures for mill margin and restocking cues.
Watch Capesize freight on Brazil–China routes during supply scares.
Define commodities sleeve % before tactical iron ore trades.
Choose vehicle: diversified miners for equity beta, DCE/SGX for pure hedge.
Document entry thesis and invalidation (e.g. port stock rebuild above threshold).

Key takeaways

Iron ore prices benchmark on Platts IODEX 62% Fe CFR China, quoted in dollars per dry metric tonne.
Supply is concentrated in Australia and Brazil; weather and miner guidance set the seaborne baseline.
Demand is derived from blast-furnace steel production, dominated by China construction and infrastructure.
Port inventories and grade spreads are the fastest fundamental signals; steel margins gate restocking.
Exposure via diversified miners or futures trades off purity, jurisdiction risk, and China market access.