Factors of rising prices for zinc and copper

DOLLAR: Industrial metals are supported by a weaker US currency, making dollar-denominated commodities cheaper for non-US firms, potentially boosting demand.

ZINC: Zinc rose 1.9 percent to $ 2,689 per tonne. It previously touched $ 2,703.5, the highest since April 7, as the market focuses on falling inventories in LME warehouses, which have declined nearly 30 percent since January.

COPPER: Copper was up 0.2 percent to $ 5,755 and lead 0.4 percent to $ 2,194, tin 0.4 percent to $ 19,585 and nickel was down 0.3 percent to 8 980 dollars per ton.