Copper prices fell in London on Friday, but were set for their best weekly gain in more than four months after officials in top metals consumer China pledged stimulus to boost the economy.

Three-month copper on the London Metal Exchange was down 0.7% at $10,008 per metric ton, as of 0546 GMT. On a weekly basis, the contract has gained 5.7% and is on track for its biggest gain since the week of May 13.

The most-traded November copper contract on the Shanghai Futures Exchange climbed 1.7% to 78,700 yuan ($11,219.62) a ton. The contract was set for a third straight weekly gain.

LME copper surpassed the $10,000 resistance level because of the trading momentum triggered by news of the Chinese stimulus, but the sustainability of the price rally depends on whether the high trading volume could persist from now, a trader said.

Beijing lowered interest rates and injected liquidity into banks this week, and potentially issued special sovereign bonds worth more than $280 billion to boost its economic growth, while more fiscal measures are expected to be announced soon.

However, China's industrial profits swung back to a sharp contraction in August for their biggest decline this year, partly due to a lack of demand and emphasising the struggles in China's economy.

LME aluminium rose 1% to $2,638 a ton, nickel edged up 0.1% at $16,765, while zinc fell 0.7% to $3,078, lead shed 0.5% to $2,126 and tin dropped 1% to $32,120.

SHFE aluminium rose 1.5% to 20,390 yuan a ton, zinc climbed 1.7% to 24,940 yuan, lead advanced 1.5% to 16,915 yuan, nickel edged up 0.1% at 128,530 yuan while tin fell 0.2% to 255,600 yuan.

($1 = 7.0145 yuan)

(Reporting by Mai Nguyen in Hanoi; Editing by Subhranshu Sahu and Sherry Jacob-Phillips)