* Copper set for steepest weekly drop since Nov 2015
* GRAPHIC-2018 asset returns: http://tmsnrt.rs/2jvdmXl (Adds analyst comment, updates prices, changes dateline from BEIJING)
LONDON, July 6 (Reuters) - Copper rebounded on Friday from a fresh 11-month low, as some investors regard the recent sharp losses as exaggerated and believe the metal has hit bottom.
Copper, widely viewed as a bellwether for the global economy, has been battered amid escalating trade tensions that resulted in the United States imposing tariffs on $34 billion of Chinese imports and Beijing quickly retaliating.
The recent downtrend - which has seen copper shed 14 percent since touching a 4-1/2 year peak of $7,348 in early June - was fuelled by computer-driven speculators and long liquidation by Chinese hedge funds, said Gianclaudio Torlizzi, Partner at consultancy T-Commodity in Milan.
"Many people are wondering if the long-term bull market is over. I don't think it's over but copper has to hold above $6,200, which is the watershed level for the long-term uptrend," he said.
"It doesn't make any sense to have such a gloomy sentiment on metals demand. This is a good opportunity to go long again," Torlizzi added, saying he had already taken a long position.
Three-month copper on the London Metal Exchange fell as much as 2 percent to $6,221.50 a tonne, its lowest since July 25, 2017, before recovering to $6,292 by 1000 GMT, down 0.8 percent.
LME copper has shed about 5 percent this week, putting it on track for its steepest weekly drop since the week ended Nov. 20, 2015.
* SHFE COPPER: The most-traded August copper contract on the Shanghai Futures Exchange dropped as much as 2.2 percent to 48,520 yuan ($7,293.50) a tonne, the lowest since July 17, 2017, before closing down 1.1 percent at 49,080 yuan. It shed 4.4 percent this week, the most since September 2015.
* ESCONDIDA: Supporting copper was news that negotiations between workers and BHP Billiton Plc at the Escondida copper mine in Chile, the world's largest, are "far from reaching agreement" with less than three weeks to go before the negotiation deadline.
* ZINC: Zinc dipped 0.1 percent to $2,696.50 a tonne, supported by a report from state Chinese research institute Antaike saying zinc production in China would decline to its lowest level since 2015 in the third quarter, according to a note by Commerzbank.
*NICKEL: LME nickel slipped 1.9 percent to $13,930 a tonne.
"Nickel remains the only long of the (LME) complex, however this has retreated to 7 percent of open interest on our estimates, down from the 33 percent peak in early-June," Alastair Munro at broker Marex Spectron said in a note.
* ALUMINIUM: LME aluminium rose 0.1 percent to $2,081 a tonne as Chinese alumina refiners cut production.
* For the top stories in metals and other news, click or
($1 = 6.6525 Chinese yuan)
(Additional reporting by Tom Daly in Beijing; Editing by Mark Potter)