The Chart That Explains Rio Tinto's Capex Problem

The first chart shows a four-year, one-way decline in free cash flow. That is not commodity-price cyclicality; iron ore prices have been relatively stable in the $100-120 per tonne range over the period. Copper has been firm. The decline is capex-driven. This fact alone reframes the valuation debate. If the decline were price-driven, the business would be more cyclical than the stock reflects. Because it is capex-driven, the decline is self-inflicted and (critically) reversible.

Look at the second chart. Capex has ramped steadily and accelerated in the most recent two years. The Oyu Tolgoi copper-gold mine in Mongolia is now in ramp-up phase. The Simandou iron ore project in Guinea will see first production in late 2025/early 2026 but capex continues through 2027. The Rincon lithium project capex completes in 2026-2027. The Montana copper-gold acquisition (announced mid-April) adds another capex leg through 2027-2028. Management guidance for FY26 capex is approximately $11-13 billion, with a step-down expected in FY27. The peak is likely FY25 or FY26; the recovery starts FY27.

The third chart shows operating income stability in the $15-16 billion range despite FCF compression. The underlying business is not degrading; it is generating normal through-cycle earnings while capex drains cash flow that would otherwise be available for shareholders. This is the distinction that matters: Rio Tinto is not a business in decline. It is a business investing through a capital-intensive cycle. The iron ore franchise (Pilbara) continues to generate industry-leading margins. The copper portfolio is becoming meaningful contribution. The aluminium and minerals segments are steady. The fundamental economics have not weakened.

The fourth chart shows the dividend yield trajectory. The FY21 dividend was exceptional (the super-cycle peak iron ore price produced a once-in-a-decade windfall payout). The trajectory since has been normalisation toward a sustainable run-rate. The current 4.0% yield reflects a dividend that is still generous relative to the sector but has declined meaningfully from the peak. The real question is whether the payout can be sustained through the capex peak. Consensus modelling suggests yes, based on FY25 FCF of $4.8 billion plus balance sheet flexibility; the payout ratio is roughly 90-95% of FCF, which is tight but manageable. A further capex surprise could push the ratio above 100%, which is when the dividend risk becomes real. That is the dimension to watch through FY26.