Copper futures climbed above $6.6 per pound on Tuesday for a second consecutive session as the market responded to signs of tighter global supply and expectations that mine output will remain constrained. Traders stayed cautious about possible US import tariffs on copper, which have continued to pull metal from overseas markets into US warehouses. The Democratic Republic of Congo's recent ban on exports of copper concentrate is seen as unlikely to significantly disrupt global supply, but the broader production outlook remains under pressure from declining ore grades, environmental regulation and geopolitical risk. Demand has remained firm as copper consumption is supported by electrification and the buildout of artificial intelligence data centers.