* Copper market focus moves to China's manufacturing data
* Freeport-McMoRan calls force majeure at Indonesia's Grasberg
* Nickel down, but supply worries fuel gains since late Jan. (Adds closing prices)
By Pratima Desai
LONDON, Feb 17 (Reuters) - The price of copper slid on Friday as a failure to sustain levels above $6,000 a tonne triggered profit-taking, although a prospect of strong demand from top consumer China and supply disruptions are expected to support prices.
Benchmark copper on the London Metal Exchange closed down 0.7 percent at $5,960 a tonne. Prices hit a 21-month high of $6,204 on Monday.
Traders said a disappointment with copper's performance since Monday had persuaded many betting on higher prices to cut back their holdings.
Reinforcing the idea of a pick-up in Chinese demand was new loans data; banks extended 2.03 trillion yuan ($295 billion) in net new yuan loans in January, the second-highest monthly tally on record.
Analysts say much of that cash has gone into manufacturing, suggesting higher demand to come for industrial metals.
"It is very possible we see higher prices. It will depend on data over the next few months, particularly from China," said Liberum analyst Ben Davis.
The focus will be on fixed-asset investment, industrial production, surveys of purchasing managers in manufacturing and property market indicators in China.
A strike at BHP Billiton's, Escondida in Chile, the world's largest copper mine, has boosted sentiment as has an output halt at Freeport-McMoRan's giant Grasberg mine in Indonesia.
Freeport-McMoRan on Friday declared force majeure at Grasberg, saying it could not meet contractual obligations on copper concentrate shipments. Exports had already been suspended for more than a month due to a government export ban.
"With ongoing supply-side issues and a sizable speculative long the price action should remain volatile," Marex Spectron analysts said in a note. "The key levels to watch are $5950-30 and $6190-6210 with plenty of whipsaw price action in between."
Elsewhere, three-month nickel ended 0.2 percent down at $11,050 a tonne, just below Thursday's two-month peak of $11,070.
It has climbed more than 15 percent since late January on concern about ore supplies from the Philippines which this week ordered the cancellation of 75 mineral production-sharing agreements, as developing them would threaten water supplies.
That came after the closure or suspension of 28 of the country's 41 mines.
About two thirds of global demand, estimated at around 2 million tonnes this year, is accounted for by stainless steel mills, mainly in China.
Aluminium closed down 0.9 percent at $1,880 a tonne and zinc fell 1.7 percent to $2,810. Lead was 1.1 percent lower at $2,252, while tin finished up 0.3 percent at $19,725 a tonne.
Three month LME copper
Most active ShFE copper
Three month LME aluminium
Most active ShFE aluminium
Three month LME zinc
Most active ShFE zinc
Three month LME lead
Most active ShFE lead
Three month LME nickel
Most active ShFE nickel
Three month LME tin
Most active ShFE tin (Additional reporting by Peter Hobson; Editing by Greg Mahlich/Ruth Pitchford)