Benchmark three-month copper on the London Metal Exchange (LME) had risen 1.4% to $9,958.50 per tonne in official trades. On Thursday, prices hit $10,008 a tonne which was the highest since Feb. 2011.
"It's a tremendously positive story for copper at the moment and in the long term," said WisdomTree analyst Nitesh Shah, adding that the metal will likely pierce through the $10,000 mark again.
The exchange, the world's oldest and largest market for industrial metals, announced a proposal in January to move to full electronic trading and held a consultation.
"The LME received an unprecedented volume of feedback ... with 192 individual responses," it said.
Benchmark copper on the London Metal Exchange was up 0.1% at $9,895 a tonne.
Copper prices dipped initially on Friday, but then joined gains in other risky assets such as world stocks, which held near record highs, lifted by strong US data and the Federal Reserve's vow to support the economy.
Three-month copper on the London Metal Exchange gained 1.1% to $9,983 a tonne in official trading, having risen to as high as $9,999.50 a tonne earlier in the session.
The last time copper rose above $10,000 was in February 2011, when it touched an all-time record of $10,190.
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.
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.
Benchmark three-month copper on the London Metal Exchange (LME) was up 1.2% at $9,180.5 a tonne in official trading, after touching a six-week high of $9,211.
Copper is used in electric cabling, construction and, increasingly, in electric vehicles and wind turbines. This has triggered a wave of bets for soaring demand and elevated prices.
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.