Chile plans a $100 billion investment to expand its copper industry and diversify its customer base beyond China, aiming to secure its position as the global market leader amid tightening supply. The strategy seeks to mitigate risks associated with geopolitical reliance on a single buyer while capitalizing on soaring demand driven by electrification and artificial intelligence. This move comes as the International Energy Agency (IEA) warns of a structural supply deficit, with primary copper supply potentially falling 25% short of requirements by 2035 under current policies.

The immediate market remains constrained by a sulfuric acid squeeze and weather disruptions. Over 15% of global primary copper is produced via leaching and solvent extraction-electrowinning (SXEW), a process threatened by supply chain bottlenecks. The Democratic Republic of Congo (DRC) and Chile are the most exposed to these shortages, with some inventories reported to be as low as 30–60 days. Additionally, extreme weather in Chile, including potential Category 5 storms, continues to threaten production stability.

Long-term Supply Constraints

The longer-term outlook is challenged by declining ore quality and rising development costs. Average copper ore grades have fallen 40% since 1991, while brownfield expansion costs have increased 65% since 2020. The timeline from discovery to production is lengthy, averaging roughly 17 years. Consequently, BMI forecasts a persistent deficit emerging from 2027, widening to almost 1.5 million tons by 2035, with prices potentially reaching $17,000 per ton.

Key Copper Deposits

The solar industry’s drive to cut costs by replacing silver with copper is colliding with a bottleneck in the metals market, as both commodities face significant supply constraints. High-efficiency panel makers are adopting copper-based alloys to escape volatile silver prices, but copper itself is becoming scarce due to depleting mines and operational setbacks in Chile, the world’s top producer. This shift exposes manufacturers to a closed-loop trap where constrained copper output limits byproduct silver supply, preventing the industry from severing ties to mining shortages.

The Copper Paradox

China’s largest solar manufacturer, Longi Green Energy, has started production at a 21-gigawatt back-contact cell line in Shaanxi. The facility utilizes Alloy Contact Matrix (ACM) technology to replace conventional silver paste with a copper-based alloy contact system. Longi described the plant as a key milestone in large-scale implementation of next-generation cell technology. The company states that ACM cells have achieved 27.6% conversion efficiency, certified by Germany’s Institute for Solar Energy Research Hamelin, while modules have reached 672 watts in TÜV Rheinland tests.

The primary commercial motivation is cost reduction, as silver paste remains a major non-silicon expense in high-efficiency back-contact cells. Although silver’s spot price has cooled significantly—down over 50% from its all-time high of $121.64 per ounce to around $58 per ounce—manufacturers prioritize insulation against sharp price swings and multi-year supply shortfalls over current pricing. The iShares Silver Trust ETF (NYSE: SLV) reflects this volatility, down about 20% year-to-date despite tightening physical inventories.

Chile’s Supply Strain

Copper supply is under severe pressure, even before accounting for increased demand from electrification-driven substitution. Codelco, the world’s largest copper producer, is servicing approximately $25 billion in debt after output slid to a 28-year low. New Chairman Bernardo Fontaine emphasized a strategic shift toward returns over sheer volume, noting that results have been weak and production has fallen below estimates for the past seven years.

May figures illustrate the extent of the stress across major Chilean mines:

Severe winter storms have further exacerbated risks, threatening mines, ports, and transport routes in a country responsible for nearly a quarter of global mined copper supply. The stress on the industrial metal is evident in market prices, with copper hitting an all-time high of $6.67 per pound in June before easing to around $6.32. The Global X Copper Miners ETF (NYSE: COPX) has risen 7.75% year-to-date and 77.54% year-over-year.

The Closed-Loop Trap

The substitution strategy faces structural limits because approximately 70% of silver is mined as a byproduct of copper, lead, zinc, and gold. Consequently, silver mine supply cannot independently respond to higher prices; it is bound to base-metal economics. Constrained copper output drags down byproduct silver supply, meaning the pivot to copper cannot independently resolve the silver squeeze it was designed to alleviate.

Evidence of this supply squeeze is mounting. COMEX registered silver holdings have fallen more than 75% from their 2020 peak to 79.9 million ounces. The Silver Institute projects a sixth consecutive annual deficit of 46.3 million ounces in 2026, with a cumulative shortfall of roughly 762 million ounces since 2021. While solar silver demand is forecast to fall 19% in 2026 to about 151 million ounces as copper metallization spreads, the transition merely moves the industry one link along the same constrained chain rather than solving the underlying scarcity.