"The stock market hit record highs. U.S. data improved. Copper is not only driven by what is going on in China," he added.
Three-month copper on the London Metal Exchange added 1 percent to $6,728.75 a tonne and the highest since March 10, before easing to $6,662 a tonne by 0233 GMT, up 0.1 percent and adding to small gains from the previous session.
The most-traded July copper contract on the Shanghai Futures Exchange also gained more than 1 percent before trading flat at 46,620 yuan ($7,500) a tonne.
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A major earthquake of magnitude 8.2 struck off the coast of Chile on Tuesday, triggering a tsunami that hit the northern part of the country and a tsunami warning for all of South and Central America's Pacific coast.
Iquique is a key copper exporting port, close to the country's main copper mines. Mining companies Codelco and BHP Billiton said that had not yet received reports of damage to mines.
London-listed Antofagasta Minerals also said on Tuesday its copper operations were unharmed.
On the demand side, manufacturing in Asia and Europe finished the first quarter on a weaker note but activity in the United States remained relatively steady, suggesting severe winter weather in North America had only a modest effect on U.S. factories.
Read MoreAre Dr Copper's days numbered?
Persistent weakness in China's manufacturing sector has reinforced fears of a sharper-than-expected slowdown at the start of 2014, and some government economists think authorities have already started boosting spending to put a floor under growth, which has lent support to copper prices.
However, for now Chinese end-users of refined copper have limited buying of spot metal to a hand to mouth basis, betting prices will decline further after a 5 percent fall last month and despite a seasonal rise in orders as well as weaker domestic supply.