LONDON: Copper prices gained for a fourth straight session on Friday as investors bet that extended easy monetary policy would help to boost economic recovery and metals demand.

Three-month copper on the London Metal Exchange (LME) had climbed 1pc to $9,534.50 a tonne by 1615 GMT, on track to finish the week in positive territory.

The European Central Bank pledged on Thursday to keep interest rates at record lows for even longer to boost sluggish inflation.

"In the last few days, the mood among market participants has changed from being quite bearish to very bullish again. I think it's the continued loose monetary policy of the ECB, and the Fed next week will be even more important," said analyst Daniel Briesemann at Commerzbank in Frankfurt.

Copper rises as investors shrug off recovery woes on upbeat earnings

"Demand optimism seems to have regained the upper hand. Just two or three days ago, there were concerns that the rapid spread of the delta variant would hit demand, but this seems to have taken a back seat now."

Copper, which is used in the power and construction industries among others, is widely viewed as a gauge of global economic health.

LME copper has eased from a record peak of $10,747.50 in May but is still up 22pc so far this year. Briesemann expects copper to head lower in coming months to around $8,500.

COLUMN-Aluminium producers struggle to respond to higher prices.

The premium for LME cash lead over the three-month contract hit $38.50 a tonne, its highest since March last year, indicating tightening nearby supply as LME inventories remain at one-year lows and floods in Germany hit European output.

LME copper may rise to $9,733 this week

LME nickel climbed to its highest in almost five months at $19,430 a tonne, a rise of 2.7pc. Tin hit a record $34,700 before pulling back to $34,385 for a gain of 0.8pc.

LME aluminium advanced 0.7pc to $2,501 a tonne, zinc added 1.1pc to $2,971.50 but lead fell 1pc to $2,375.