Copper for delivery in three months hit $7 329,50 a ton on the London Metal Exchange, the lowest since early February and was trading at $7 375 a ton from $7 410 at the close on Friday.
The metal used widely in power and construction has tumbled about 17 percent since a record high of $8 940 on July 2.
The dollar rose to six-month highs against the euro, beyond $1,50, as the market started to worry that economic slowdown in the United States was spreading to other countries and regions including the euro zone.
"The dominant driver is the dollar strengthening ... If it heads higher then of course industrial metals will stay on the defensive," Calyon analyst Robin Bhar said.
"Concerns about global growth are ongoing ... Consumers are sniffing at these prices, but they will take to the sidelines if prices start to fall again."
A stronger US currency makes metals denominated in dollars more expensive for holders of other currencies.
Analysts said the week could see some volatile trading as investors try to decide whether the dollarwould be able to sustain gains.
However, a narrowing of the gap between copper prices in Shanghai and London could encourage Chinese buyers who have been shunning the international market over the last few weeks.
"As underlying metals demand in China is still healthy ... we believe this will give an incentive for Chinese buyers to gradually increase imports," Lehman Brothers said in a note.
"[That] should then also better support copper prices on the LME in the medium term."
Energy-intensive aluminium hit a three-month low of $2 840 a ton and was last at $2 854 a ton from $2 850 at the close on Friday.
Analysts estimate up to 45 percent of aluminium smelting costs are accounted for by electricity.
The metal used in packaging, transport and power hit a record high of $3 380 on July 10 on escalating worries about supplies power shortages and supplies from China, the world's top producer and consumer.
Traders said news that China exported 93 441 tons of unwrought primary aluminium and aluminium alloy in July, down from June's 123 538 tons would help support. ID.
Opinion about aluminium's prospects is divided between those who think weak demand and an oversupplied market will hit prices and those who expect high energy prices and costs and production losses in China will boost prices.
Battery material lead touched a three-week low of $1 910,25 a tonne and was last at $1 945 a ton from $1 974 and tin was at $18 800 from Friday's last bid at $19 000.
Zinc touched a two-and-a-half year low of $1 652 from Friday's last bid at $1 685 and nickel, used to make stainless steel, was at $17 950 a ton from $18 050.