Rio Tinto reshapes resource base with major reserve and classification updates

The latest update is out from Rio Tinto ( (GB:RIO) ).

Rio Tinto has updated its Mineral Resources and Ore Reserves ahead of its 2025 annual reporting, announcing a series of reclassifications and volume changes across key copper, aluminium and borates assets. The adjustments reflect new drilling data, updated orebody knowledge and refined economic assumptions, with no material changes to governmental, environmental or community factors.

At the Oyu Tolgoi Oyut open pit in Mongolia, Proved and Probable Ore Reserves rose 8%, driven by converting Inferred to Indicated resources through denser drilling, while overall Mineral Resources at pit level fell 14%. In Utah, the Kennecott Bingham Canyon open pit saw a substantial conversion of Mineral Resources into Ore Reserves, sharply reducing reported resources, while the underground deposit posted a 122% increase in Mineral Resources and an 85% rise in Ore Reserves as confidence in the orebody improved.

In Queensland, the Amrun bauxite operation recorded a 13% net increase in Ore Reserves, including a major shift from Probable to Proved status, after a routine review of life-of-mine economics and orebody understanding, though Mineral Resources exclusive of reserves declined as material was converted. At Rio Tinto Borates’ Boron operations, Mineral Resources grew by 9.3 million tonnes of saleable boric oxide as stockpile studies advanced, while total Ore Reserves were steady but reclassified, with some Proved tonnage moved to Probable under a stricter geotechnical standard.

The most recent analyst rating on (GB:RIO) stock is a Hold with a £6900.00 price target. To see the full list of analyst forecasts on Rio Tinto stock, see the GB:RIO Stock Forecast page.

Spark’s Take on GB:RIO Stock

According to Spark, TipRanks’ AI Analyst, GB:RIO is a Outperform.

Rio Tinto’s strong financial performance and strategic corporate events are the most significant factors driving its stock score. The company’s solid balance sheet and effective cash management provide a stable foundation, while recent strategic initiatives enhance growth prospects. Technical indicators support a positive outlook, though caution is advised as RSI approaches overbought levels. The valuation remains attractive, offering a good balance of growth and income potential.

To see Spark’s full report on GB:RIO stock, click here.

More about Rio Tinto

Rio Tinto is a global mining and metals group with operations spanning copper, aluminium, iron ore and industrial minerals such as borates. The company develops and operates large-scale open pit and underground mines across regions including Mongolia, the U.S. and Australia, supplying raw materials critical to industrial, construction and energy markets worldwide.

Average Trading Volume: 3,126,364

Technical Sentiment Signal: Buy

Current Market Cap: £120.8B

For a thorough assessment of RIO stock, go to TipRanks’ Stock Analysis page.