U.S. Copper Stockpiles Jump 300% to 590,000 Tons on Tariff Fears
US copper inventories in COMEX-approved storage reached 590,000 short tons—the highest in over 30 years—as stocks surged nearly 300% year-over-year ahead of potential 15%–25% tariffs. Domestic mines and scrap now cover 146% of annual consumption but limited processing capacity forces large-scale raw copper exports for overseas refining.
1. Production Surplus and Self-Reliance
The U.S. now produces enough copper from domestic mines and scrap to meet 146% of its annual demand, a stark contrast to China’s 40% self-sufficiency rate. This surplus positions the country as more self-reliant in raw copper supply than any other major consumer market.
2. Refining Capacity Bottleneck
Despite ample raw output, the U.S. lacks sufficient domestic processing facilities to convert ore into copper cathode, the form required by manufacturers. As a result, large volumes of unrefined copper are exported for overseas refining—primarily in China—and then reimported as cathode.
3. Inventory Surge and Tariff Implications
COMEX-approved copper stocks surged nearly 300% over the past year to 590,000 short tons, the highest level in over three decades, driven by traders preloading shipments ahead of potential 15%–25% tariffs on refined copper. This stockpile buildup has coincided with a near 40% price rally, fueled by supply concerns and looming trade measures.