Why Copper Hit a Record Near $6.70: The Supply Squeeze Behind August’s Rally

U.S. buyers added to that pressure. Expectations of possible import tariffs encouraged companies to bring metal into the country ahead of a policy decision. Reported U.S. copper imports reached about 200,000 tonnes in July, while inventories outside the United States declined. That tariff positioning pulled available units toward the U.S. and reduced flexibility elsewhere.

Mine disruptions exposed a weak supply chain

The bottleneck began upstream. Production risks and disruptions involving major mining regions, including Chile and the Democratic Republic of Congo, weakened the outlook for concentrate—the partially processed material smelters need to produce refined copper. Analysts described the early-August move as supply-driven despite limited demand growth, rather than as proof of synchronized strength across global industry.

Copper’s treatment and refining charges provided an unusually direct confirmation. The annual 2026 benchmark fell to zero dollars per tonne, while spot charges turned negative. In practical terms, some smelters were paying miners to secure concentrate. That shifts bargaining power and processing margin toward mine owners and indicates that smelting capacity was more plentiful than the raw material available to feed it.

A zero or negative charge does not guarantee permanently high copper prices. Smelters can reduce output, industrial users can defer purchases, and mine production or logistics can recover. But it does show that the market’s constraint was not simply a lack of refining capacity; concentrate availability had become central.

AI and electrification supported the demand floor

The demand story still mattered. AI data centers require additional electricity infrastructure, including transmission, distribution, cooling and backup systems. Renewable-energy projects, grid investment, electric vehicles and broader electrification also depend on copper-intensive equipment. These trends gave demand a durable floor and made buyers less able to postpone purchases when inventories tightened.

That is different from saying AI caused the entire rally. The available reporting points to structural demand meeting disrupted supply. AI and electrification helped the market absorb high prices, while the sharpest August move came when physical availability, tariff behavior and mine-supply concerns converged.

Hormuz disruption raised costs through sulfur and logistics

The Strait of Hormuz added another layer of stress. Disrupted shipping affected sulfur and sulfuric-acid availability, both important inputs for parts of the copper-mining and leaching process. One analysis estimated that Hormuz-related disruptions raised copper-mining costs by 5.1%, or more than $0.10 per pound, during the first half of 2026, with reagent costs—particularly sulfur-related inputs—driving much of the increase.

Other reporting linked the disruption to a major reduction in seaborne sulfur shipments from the Persian Gulf and described sulfuric acid as a critical input for the solvent-extraction and electrowinning process, which accounts for a significant share of global copper production. The exact supply impact is uncertain, but the direction is clear: transport and input constraints made already-tight production more expensive and less reliable.

Macro conditions amplified the move

More supportive financial conditions helped capital flow into industrial metals. A weaker dollar, receding rate-hike expectations and improved risk appetite supported the broader metals complex and made dollar-denominated commodities more attractive. Those factors amplified the rally and encouraged inflation hedging, but they did not create the underlying mine-and-concentrate deficit.

What the rally says about copper’s outlook

Copper had already repriced scarcity before the U.S. futures spike. LME prices briefly exceeded $14,500 per tonne in January, and later cash prices again approached that level. The repeated tests of record territory indicate that traders were responding to a broader supply-chain problem rather than one isolated session.

The most defensible conclusion is structurally bullish but tactically fragile. AI infrastructure, grids and electrification support long-term consumption, while the near-term price depends on several variables:

• LME and other warehouse inventories
• U.S. tariff decisions and further stockpiling
• Mine reliability in Chile, the DRC and other producing regions
• Sulfur, acid and shipping availability
• Chinese buying and refined-copper output

High prices can also weaken demand. Reporting around the August pullback pointed to softer Chinese buying and lower refined output, showing that the rally was already creating its own pressure points.

In short, copper’s record was a collision between a resilient long-term demand story and an acute shortage of deliverable metal. If prompt inventories remain low and mine disruptions persist, prices can stay elevated. If logistics normalize, smelters curtail production, Chinese demand weakens further or disrupted mines recover, the same market could unwind quickly.