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Aluminium and copper both gain while aluminium declines due to concerns about increased supply

On Wednesday, copper prices rose to their highest level in over a week due to a weaker dollar. Aluminium prices fell as raw materials prices dropped, raising the expectation of increased supply.

The price of three-month copper at the London Metal Exchange was up by 0.1% to $9,160 per metric tonne at 1030 GMT, after reaching its highest level since January 27 at $9204.

The dollar index was weaker, but the yen was stronger.

The dollar is weaker, making commodities priced in U.S. dollars less expensive for buyers of other currencies.

On the first trading day since the Lunar New Year holiday, the most active copper contract at the Shanghai Futures Exchange dropped 0.3%, to 75,290 Yuan ($10342.60), per ton.

LME Aluminium fell by 0.9%, to $2.613.50 per ton. On Jan. 20 the metal, which is used for transport, packaging, and construction, was at its highest price in over two months, partly because of concerns about shortages and high prices of alumina, a raw material.

"The bullishness of aluminium was overdone. "With alumina prices much lower, there's a very strong incentive to increase output", said Dan Smith. He is the head of research for Amalgamated Metal Trading.

The price of alumina on SHFE has dropped by one-third this year, to 3,588 yuan a ton. This is after the prices reached record highs in 2017.

Smith was also skeptical that the government's 45 million ton annual cap on aluminum smelter output in China would be strictly adhered to.

I have a hunch it's not as secure as you think. It wouldn't be surprising to me if China's supply side surprised me on the upside."

Other metals include LME zinc, which fell 1%, to $2,779.50 per ton, while lead rose 0.7% to 1,984, nickel climbed 0.4% to 15,335 and tin grew 0.9% to 30,530. Reporting by Eric Onstad. ($1 = 7.2796 Chinese Yuan). Editing by Jane Merriman

(source: Reuters)