The most-traded August copper contract on the Shanghai Futures Exchange increased 0.8% to 68,740 yuan ($10,632.14) a tonne.
Click here for an interactive chart of copper prices
China will sell another 30,000 tonnes of copper, 90,000 tonnes of aluminum, and 50,000 tonnes of zinc from its state reserves on July 29, less than the market has anticipated.
“It is slightly less than the market expected but it should be priced in already as it’s pretty well flagged,” Anna Stablum, a commodities broker at Marex Spectron, said of the auction.
The auction marked the second sale by China this month as the government aims to rein in skyrocketing commodity prices.
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Since announcing the sale of stockpiled base metals on June 16, domestic futures prices have been little changed, or risen slightly.
The global world refined copper market showed a deficit of 75,000 tonnes in April, compared with 13,000 tonnes deficit in March, the International Copper Study Group said in its latest monthly bulletin.
World refined copper output in April was 2.07 million tonnes, while consumption was 2.14 million tonnes.
(With files from Reuters)
