Copper’s Rally Meets a Deepening Supply Crunch

Copper’s rally is supported by a deepening structural supply deficit, while tariff-driven inventory distortions and resilient strategic demand increase both the upside potential and volatility of the market.

• Copper rose 4.41% in August 2026 and 16.00% year to date through August 31, while copper-mining equities gained 17.11% in August and 30.51% year to date; junior miners rose 20.76% and 21.90%, respectively.
• Global mined copper production fell 1.1% year over year in the first half of 2026 after the Grasberg and Kamoa-Kakula disruptions removed an estimated 600,000 metric tons of expected 2026 output, equivalent to about 2.5% of annual global supply.
• Chile, which represented 23% of global mine output in 2025, saw production decline 6.6% in the first half of 2026 and 9.4% year over year in July; Cochilco cut its 2026 forecast to 5.27 million metric tons.
• Codelco withdrew its 2026 production target after missing targets for seven consecutive years, while Antofagasta and Lundin Mining lowered guidance by a combined 35,000 to 55,000 metric tons; BHP expects declining grades at Escondida to reduce FY2027 output by about 210,000 metric tons.
• U.S. copper cathode imports reached a record 223,000 metric tons in July, and COMEX inventories increased 712% between February 2025 and August 2026 as tariff expectations redirected metal from LME and SHFE warehouses; immediately available LME copper traded at a $545-per-ton premium to three-month metal.

Takeaway: Investors should expect continued sensitivity to Chilean and DRC supply, sulfuric-acid availability and U.S. tariff decisions, with constrained supply and grid, AI-data-center and defense demand supporting copper prices and the margins of pure-play miners, but with substantial policy-driven volatility.