Highlights

  • London copper eased at the end of October and was heading for its maiden monthly decline since June, ending a run of monthly gains.
  • Concerns about returns on heavy artificial intelligence spending weighed on risk appetite, while tight near-term Supply and firm Chinese Demand offered support.
  • Rio Tinto (ASX:RIO) began progressively restarting underground operations at Oyu Tolgoi in Mongolia after a seismic event.

Copper has ranked among the most closely watched commodities in Australia this year, given its role in electrification, data centres and grid infrastructure, and its importance to diversified miners and developers among Metal and Mining Stocks on the ASX. At the end of October, the metal lost some momentum. Ing republished, benchmark copper on the London Metal Exchange eased on the final trading day of the month and was on track for its maiden monthly loss since June. The pullback was linked to concerns over whether heavy spending on artificial intelligence would deliver adequate returns, which dampened appetite for riskier assets. In the same session, Rio Tinto (ASX:RIO) began restarting underground operations at its Oyu Tolgoi copper mine in Mongolia following a seismic event, adding a supply-side element to the week's news.Metal and Mining Stocks

AI Spending Concerns Weigh on Risk Appetite

The softer tone in copper reflected developments well beyond the mining sector. Market Participants questioned whether the scale of Capital being committed to artificial intelligence by large technology companies would generate sufficient returns. That uncertainty, combined with higher oil prices and a slump in technology shares, prompted a shift of money into government bonds.

Copper has been closely associated with the AI theme because of expected demand from data centres and the power networks needed to support them. As a result, shifts in sentiment towards technology spending can influence the metal's price, even when physical market conditions remain supportive. The metal had also eased back from the record level it reached in September.

Tight Near-Term Supply Provides a Counterweight

Despite the monthly decline, indicators of physical tightness remained in place. Backwardation, where the London cash contract trades at a premium to the benchmark forward contract, stayed elevated. Months of metal being shipped into United States stockpiles have reduced availability in traditional consuming hubs.

Neil Welsh, head of metals at broker Britannia Global Markets, said backwardation in copper remains elevated, pointing to persistent near-term tightness. In China, the Yangshan copper premium, a gauge of demand for imported metal, was near its highest level in many years. Tighter domestic scrap supplies and the pullback in London prices have helped support that premium.

Rio Tinto Restarts Oyu Tolgoi Underground Operations

Rio Tinto's Oyu Tolgoi mine was affected by a seismic event that triggered a localised rockfall in a temporary storage area next to the production zone. Several employees were injured, with no fatalities reported, and the company said there was no structural damage to the underground cave or operating infrastructure. Mining was temporarily halted while safety reviews were completed.

Rio Tinto said it had begun progressively restarting underground operations after those reviews. Delays at the Ganqimaodu border crossing between China and Mongolia, which have reduced the trucks available to move copper concentrate from the mine. Oyu Tolgoi is jointly owned by Rio Tinto and the Mongolian Government and is described as central to the company's copper growth strategy.

Chilean Output and Other Base Metals

Supply from Chile, the world's largest copper producer, also remained in focus after data showed national output fell year on year in September. Disruptions at major producing regions continue to shape views on market balance.

Other base metals on the London Metal Exchange were also weaker. Tin fell to its lowest level in several months, with AI spending worries weighing and Indonesian refined tin exports declining year on year. Aluminium, zinc, lead and nickel all eased during the session.

Risks and Uncertainties for Copper Markets

The copper market faces competing forces. Weighing on prices are macroeconomic and sentiment risks, including uncertainty over technology spending, Interest Rate expectations and energy prices. Offsetting those pressures are physical constraints, such as tight inventories outside the United States, operational disruptions and logistical bottlenecks at border crossings.

For miners, operational events such as the Oyu Tolgoi seismic incident highlight the safety and continuity risks inherent in large underground operations, particularly block cave mines. Logistics also matter, as concentrate must reach smelters reliably for production to translate into sales.

Sentiment and Supply Pull Copper in Different Directions

Copper's October pullback shows how sentiment towards artificial intelligence spending and broader risk appetite can affect the metal, even while backwardation and Chinese Import premiums point to tight physical conditions. Rio Tinto's progressive restart at Oyu Tolgoi and softer Chilean output add to a supply picture that remains under scrutiny. For the Australian market, these crosscurrents remain relevant to diversified miners and copper-focused companies listed on the ASX.