Benchmark copper on the London Metal Exchange traded up 1.5% at $9,894 a tonne in official rings, a gain of 27% this year.
"Chilean port workers called a strike over pension-related issues. They are being supported by the mining unions. There is no indication of supply disruptions, but copper prices have rallied," said Julius Baer analyst Carsten Menke.
Benchmark copper on the London Metal Exchange (LME) traded 1.9% up at $9,730 a tonne in official rings. Prices of the industrial metal earlier hit $9,750 a tonne, its highest since August 2011.
The Chile news helped, but there was already a lot of momentum based on a few things, including stocks and the dollar.
Benchmark copper on the London Metal Exchange was up 1.9% at $9,736 a tonne at 1140 GMT. Prices of the industrial metal earlier hit $9,750 a tonne, the highest since August 2011.
Stocks of copper in LME registered warehouses at 155,100 tonnes have fallen about 10% over the past couple of weeks.
Benchmark aluminium on the London Metal Exchange was up 1% at $2,387 a tonne at 1121 GMT. Prices of the metal used widely in the transport, construction and packaging industries earlier touched $2,389, a gain of more than 20% since January.
Electricity, much of it from coal in China, can account for 30%-40% of aluminium smelting costs.
Three-month copper on the London Metal Exchange was up 0.1% at $9,455.50 a tonne by 1010 GMT, recovering after touching an intraday low of $9,385.
"Days like today when there is no major news flow, some people are saying copper and aluminium are both looking quite pricey, so why not take some profits out of this stellar run that we've had," he said.
"That February high" -- $9,617 -- "will be tested sooner or later," said Saxo Bank analyst Ole Hansen, taking prices to their highest since 2011. Prices would then target $10,000 a tonne, he said.
World shares traded near record highs with investors generally upbeat about the prospects for a global economic recovery from COVID-19.
Benchmark copper on the London Metal Exchange (LME) was down 0.3% at $8,984 a tonne by 1206 GMT but up about 2% for the week and on course for its first weekly rise in a month.
A barnstorming economic recovery in China and speculative buying pushed the metal used in power and construction to $9,617 in February, its highest in a decade, before prices stagnated.
"Copper prices have settled around $9,000, not $8,000, which tells you the market is fairly tight," said Guy Wolf, global head of analytics at Marex.
"The outlook is very uncertain, the key thing is will vaccines stop the spread of the coronavirus. Once people believe the vaccine stops you infecting other people, things will start moving."
Benchmark copper on the London Metal Exchange (LME) shed 0.8% to $8,974.50 a tonne in official trading. The metal touched its highest since March 23 at $9,104 in the previous session.
Copper inventories in LME-registered warehouses have since surged to 150,325 tonnes compared to 74,200 tonnes at the end of February.
Coronavirus cases in Chile surged past 1 million, while infections across Latin America, which has some of the world's biggest copper mines, are also rising.
Three-month copper on the London Metal Exchange climbed as much as 3.6% to $9,104 a tonne, its highest since March 23.
The most-traded May copper contract on the Shanghai Futures Exchange also hit its highest in two weeks, advancing as much as 2.3% to 67,670 yuan ($10,330.82) a tonne.
Three-month copper on the London Metal Exchange climbed as much as 3.6% to $9,104 a tonne, its highest since March 23.
The most-traded May copper contract on the Shanghai Futures Exchange also hit its highest in two weeks, advancing as much as 2.3% to 67,670 yuan ($10,308.32) a tonne.
There are concerns about China deleveraging; that seems to be uppermost in a lot of people's minds. How much more tightening is there to come? And the Chinese economy seems to be slowing anyway.
Copper inventories are rising on the LME and it seems that demand for the time being has come off the boil, which is a bit concerning because we're going into the seasonally strong part of the year.