A critical shortage of sulfuric acid in Chile is revealing vulnerabilities in the global copper supply chain, highlighting the industry’s dependence on specific chemical inputs essential for production. As the world’s leading copper producer, Chile generates approximately 5.5 million tonnes of copper annually, with over half of its refined output reliant on leaching processes that necessitate significant quantities of sulfuric acid.
The current disruption stems from a sudden policy shift in China, where exports of sulfuric acid to Chile have ceased entirely. This change prioritizes domestic fertilizer needs, redirecting shipments to countries like India and Indonesia. Consequently, this has led to a fragmentation of global trade flows, creating uncertainty for producers who rely heavily on imports.
The impact of this shortage is particularly pronounced in northern Chile, especially around the Atacama Desert, where leaching operations are prevalent due to the abundance of oxidized ores. This geographic concentration heightens risks as multiple mines vie for limited supplies of sulfuric acid, putting pressure on transport and storage systems and potentially escalating local disruptions into national supply crises.
Estimates regarding the potential impact on copper output vary significantly. Morgan Stanley suggests that up to 1.1 million tonnes of annual production could be at risk, while Goldman Sachs estimates a loss of around 200,000 tonnes, equating to approximately 1% of global supply. This disparity reflects uncertainties surrounding access to alternative suppliers and operational flexibility amid rising costs and logistical challenges.
Moreover, the situation is exacerbated by the increasing reliance on lower-grade ores that require more sulfuric acid per tonne of copper extracted. The shortage affects production through various channels: direct disruption halting leaching processes, cost inflation making marginal mines unviable, logistical bottlenecks in transport and storage, and technical barriers associated with using alternative acids that may necessitate process modifications.
Domestic production of sulfuric acid offers limited relief. While smelters produce it as a by-product, they face capacity constraints and geographical mismatches that hinder effective distribution. State-owned Codelco may benefit from governmental support, but private operators are left more vulnerable to market fluctuations.
Should disruptions persist in Chile, upward pressure on global copper prices is anticipated. In a moderate scenario, losses might be offset by existing inventories; however, a severe scenario could lead to significant supply deficits and sustained price increases across various industries reliant on copper—including renewable energy, electric vehicles, construction, and electronics.
This crisis underscores the fragility of interconnected supply chains within the mining sector. A policy decision affecting a single chemical input can significantly alter global production dynamics. Long-term strategies to mitigate such risks include diversifying supply sources, enhancing domestic capacity for sulfuric acid production, and investing in innovative technologies such as bioleaching and recycling processes.
