LONDON, March 24, 2026, 13:40 GMT
Rio Tinto fell in London trading Tuesday, with shares changing hands at 6,324 pence as of 1325 GMT, slipping roughly 0.8% from Monday’s 6,375 pence finish. Investors digested another warning that pricier diesel could tack billions more onto iron ore mining costs.
This shift is significant for Rio, still wrestling with storm fallout in Queensland, just as cost pressures across the sector are creeping into valuations. London’s mining index slipped 0.4%, while the FTSE 100 edged 0.1% lower. Oil’s leap back above $100 a barrel kept investors on edge about the Middle East conflict.
Fortescue metals and operations CEO Dino Otranto told Reuters a 10-cent shift in diesel prices hits his company to the tune of $70 million, and he estimated a “half a billion U.S. dollar impact” for the top four miners’ cost base. On Monday, benchmark Singapore diesel swaps were above $180 a barrel—nearly double the $92.5 they fetched before the war, an abrupt swing for an industry running on fuel for trucks, trains, and ports. Reuters
Rio is facing its own hurdles. On March 20, the company announced it had paused operations at the Amrun and Andoom bauxite mines in northern Queensland as Tropical Cyclone Narelle swept through. Those two sites typically turn out roughly 30 million metric tons of bauxite—the primary source for aluminium. Investors reacted: Rio’s Australian-listed shares slid up to 4% that day.
It’s part of the reason cost control and cash generation are under the microscope. On Feb. 19, in its annual results, Rio reported 2025 operating cash flow up at $16.8 billion, stuck with its $6.5 billion ordinary dividend, and CEO Simon Trott described the business as “stronger, sharper and simpler.” Rio Tinto
Rio, following BHP’s playbook, is putting more of its chips on copper as iron ore loses steam. Reuters crunched the numbers last month: iron ore made up around 60% of Rio’s earnings—down from 70% the year before. Copper, on the other hand, climbed to nearly 30%, effectively doubling its share.
China is trickier. According to Reuters, the country—responsible for roughly 75% of seaborne iron ore demand—brought in more ore at the beginning of 2026. But instead of ramping up steel production, much of that ore landed in storage. Steel output for January and February dropped 3.6% compared to the same period last year.
Rio faces a clear risk here. High diesel prices combined with sluggish Chinese steel demand could hit from both ends—costs climbing, while iron ore prices slip. On the other hand, if fuel prices ease and Queensland’s mines get back up to speed soon, Tuesday’s drop might just reflect sector nerves rather than a verdict on Rio.
Tuesday marks the last chance for Rio shareholders to make their dividend elections—a minor note on the calendar, yet a reminder of how much the stock’s draw remains tied to its yield. Market data put Rio’s yield close to 4.6%. Back in February, the company reaffirmed plans to keep a 60% payout ratio.
