Comex copper futures ended higher on Tuesday, while London copper prices reached their highest level in four weeks as speculators kept buying in response to expectations of potential shortages in China. China announced plans in July and August to curb waste imports, including scrap metal, but it was unclear how severe the restrictions would be on copper. Copper on LME improved further after news that Congo’s mines minister has ordered a joint venture of Chinese investors to stop exporting raw copper and cobalt before processing because of their low value on international markets.

Copper futures for December delivery rose 1 percent to settle at $3.061 a pound on the Comex metals division of New York Mercantile Exchange. While, copper on the London Metal Exchange ended up 1.4 percent at $6,760 a metric ton.

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