LONDON, March 24, 2026, 13:40 GMT
Rio Tinto shares slipped in London on Tuesday as investors weighed a fresh warning that higher diesel prices could add billions of dollars to iron ore miners’ costs. The stock traded at 6,324 pence by 1325 GMT, down about 0.8% from Monday’s 6,375 pence close. 1
The move matters because Rio is still dealing with storm disruption in Queensland and because the broader market is starting to price in a nastier cost backdrop for miners. London’s mining index was down 0.4% and the FTSE 100 slipped 0.1% as oil rebounded above $100 a barrel and investors stayed wary over the Middle East conflict. 2
Fortescue metals and operations chief executive Dino Otranto told Reuters that a 10-cent move in diesel prices would cost his company $70 million and have a “half a billion U.S. dollar impact” on the cost structure of the top four miners. Benchmark Singapore diesel swaps were trading above $180 a barrel on Monday, up from $92.5 before the war broke out, a sharp shift for a sector that burns fuel across haul trucks, rail and port networks. 3
Rio has its own operational overhang. The company said on March 20 that it had temporarily shut the Amrun and Andoom bauxite mines in northern Queensland as Tropical Cyclone Narelle hit the region; together, the two sites produce about 30 million metric tons of bauxite, the ore used to make aluminium, and Rio’s Australian-listed shares fell as much as 4% on the day. 4
That helps explain why investors are watching costs and cash generation so closely. In its Feb. 19 annual results, Rio said 2025 operating cash flow rose to $16.8 billion, it kept a $6.5 billion ordinary dividend, and Chief Executive Simon Trott said the group was becoming “stronger, sharper and simpler.” 5
Like rival BHP, Rio has been leaning harder on copper as iron ore prices soften. A Reuters analysis last month showed iron ore still accounted for about 60% of Rio’s earnings, down from 70% a year earlier, while copper’s share had roughly doubled to about 30%. 6
China remains the harder question. Data cited by Reuters last week showed China, which buys about three-quarters of seaborne iron ore, imported more ore early in 2026 but was sending more of it into stockpiles rather than steel mills, while steel output in the first two months fell 3.6% from a year earlier. 7
That leaves a plain risk for Rio. If diesel stays high and Chinese steel demand stays soft, the group could be squeezed by both rising costs and weaker realised iron ore prices; if fuel cools and Queensland operations restart quickly, Tuesday’s fall may end up looking more like a sector wobble than a fresh judgment on Rio itself. 3
Tuesday is also Rio’s final date for shareholder dividend elections, a small calendar marker but one that underlines how much of the stock’s appeal still rests on income. Market data show Rio yielding about 4.6%, and the company said in February it intended to sustain a 60% payout ratio. 8
