BHP Group ($BHP) has announced a A$840 million (US$555 million) investment in its Olympic Dam operations in South Australia, marking the first stage of a broader expansion aimed at doubling copper production from the state by the mid-2030s.
The investment package includes funding for an underground access tunnel, a new backfill system, expanded ore pass capacity, and a new oxygen plant to enhance the efficiency of the existing smelter. The move signals BHP’s intent to strengthen its domestic production base as global copper demand accelerates.
Olympic Dam, located near Roxby Downs, is one of the largest polymetallic deposits in the world, hosting substantial copper, uranium, and gold reserves. The site has produced over 300,000 metric tons of copper annually for the past three years and is a cornerstone of Australia’s ambitions to become a leading supplier of critical minerals for the global energy transition.
Strategic Positioning
BHP’s Copper South Australia division includes Olympic Dam, the Prominent Hill, and Carrapateena projects — a regional portfolio the company calls “Copper SA.” Together, these assets form one of the world’s largest integrated copper provinces.
The miner said it expects to make a final investment decision by mid-2027 on a full-scale smelter and refinery expansion, which would raise copper output to around 650,000 tons annually by the mid-2030s.
“Together, these projects and those underway elsewhere across Copper SA will improve efficiency and support future growth options of South Australia’s copper province,” BHP said in a statement.
Market Context
The announcement comes amid heightened volatility in global copper markets, with supply disruptions at Indonesia’s Grasberg mine and operational setbacks in Chile tightening short-term availability. At the same time, long-term structural demand continues to strengthen — driven by grid expansion, EV manufacturing, and renewable power infrastructure.
According to the International Energy Agency, global copper demand could double by 2035, creating a supply gap exceeding 6 million tons per year without new large-scale investment. BHP’s expansion at Olympic Dam is among a small number of projects globally capable of materially easing that deficit.
Takeaway
For investors, BHP’s commitment underscores the company’s strategy to consolidate its position as a tier-one copper producer while positioning Australia as a stable source of supply amid geopolitical and operational risks elsewhere. As the world’s largest listed miner moves toward a mid-decade decision on Olympic Dam’s next phase, the project stands as one of the few credible pathways to meaningful global copper supply growth.
