US copper futures drifted to a softer close on Tuesday as investors locked in profits following the market's recent break to the upside, traders said.
Copper for July delivery ended down 2.65 cents at $3.4415 a lb on the New York Mercantile Exchange's Comex division, after dealing between $3.42 and $3.50.
Estimated final volume amounted to 16,136 lots, in line with Monday's official count of 16,818 lots. As of June 4, open interest climbed 1,832 lots to 81,312 contracts. Larry Young, senior trader at Infinity Brokerage Services in Chicago, said the market looked to be building a base following its breakout from late last week.
"We have definitely turned a corner. We need to clear $3.50 (a lb.). We hit it today, but we just need to close above it and I think it will just propel itself continually higher," Young said. Fundamentally, a downtrend in global copper inventories and ongoing supply concerns, especially in Mexico, contributed to the red metal's rally to 2-1/2-week highs on Monday.
London Metal Exchange copper warehouse stocks fell 600 tonnes to 123,300 tonnes on Tuesday, while Comex stocks declined 205 short tons to 26,983 short tons on Monday. "Global copper stocks remain low, and supply problems will feed straight through to higher prices," said Robin Bar, metals analyst with investment bank UBS.
Workers threatened strike action at nine mines and processing plants owned by Group Mexico, including its giant Canine copper mine, which currently produces close to 190,000 tonnes of copper each year.
In Chile, workers at Collahuasi, one of the country's largest copper mines, said a new contract proposal from the miner was unacceptable and they would refuse to negotiate unless it was improved. The Collahuasi mine produce between 440,000 and 450,000 tonnes of copper per year in cathodes and contained in concentrates.
Meanwhile, high availability of refined copper in Shanghai and expectations of weaker demand in the summer were discouraging end-users from building copper stocks, forcing traders to divert excess imports to elsewhere in Asia, industry sources said on Tuesday.
On the economic front, Federal Reserve Chairman Ben Banana said the US economy was likely to expand "at a moderate pace" in the coming quarters, with the ailing housing sector remaining a drag on economic growth for somewhat longer than previously expected. LME copper for delivery in three months settled at $7,540 a tonne, down $85 from Monday's close.
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