METALS-Copper extends rally on global stimulus hopes

* Investors cheered by comments from European officials

* U.S. Q2 GDP dips as expected; QE hopes grow

* Copper open interest drops to Aug 2007 low

(Recasts, adds New York dateline, updates with New York closing copper price,
adds analyst comments)

By Chris Kelly and Harpreet Bhal

NEW YORK/LONDON, July 27 (Reuters) - London copper futures rolled gains into
a fourth straight day on Friday, buoyed by growing expectations of further
stimulus action from both the U.S. Federal Reserve and the European Central
Bank.

Dollar-denominated copper prices received an additional boost from the euro,
which rallied to a three-week peak against the greenback after French President
Francois Hollande and his German counterpart, Angela Merkel, said they were
determined to do all they can to safeguard the euro.

Those comments followed a promise by ECB head Mario Draghi on Thursday to do
"whatever it takes to preserve the euro."

"There was a big relief rally after Draghi's comments calmed the market down
by saying the ECB will do whatever it takes for the euro zone, and the market is
reassured by that," said Nic Brown, head of commodity research at Natixis.

London Metal Exchange (LME) three-month copper firmed $98 to close
at $7,568 a tonne, off an intra-day peak of $7,584, climbing further away from
Wednesday's one-month low of $7,344.25.

Still, prices of the red metal have slipped about 1.5 percent so far this
month.

In New York, the COMEX September contract rose 3.25 cents to settle
at $3.4260 per lb, near the upper end of its $3.3790 to $3.4390 session range.

Prices digested and maintained momentum after data showed second-quarter GDP
growth in the United States slowed to 1.5 percent, as expected as consumers
spent at their slowest pace in a year.

"The U.S. economy is growing, but today's number was right on the fence
between stronger growth and no Fed action, and weaker growth with Fed action,"
said Adam Sarhan, chief executive of Sarhan Capital.

"Today's GDP report is inconclusive ... However, when you put this piece of
the puzzle with the other pieces in the global economy, it's still leaning
toward further easing."

Whispers are beginning to grow louder in hopes that the U.S. Federal Reserve
will announce a third round of bond purchases, also known as quantitative
easing, when it meets next week.

UNCERTAINTY PERSISTS

Investors worry that demand from top consumer China, which accounts for 40
percent of global copper demand, has been slow to pick up so far this year,
dragging prices 9 percent lower in the second quarter.

But China's refined copper consumption is forecast to rise by about 5
percent in the second half of 2012 from a year ago, a state-backed research firm
said, led by higher demand from power cable makers as the government takes steps
to boost the economy.

Still, the open interest in the LME copper contract has dropped to its
lowest level in nearly five years, reflecting a lack of conviction about
copper's near term price direction. The latest LME data shows open interest at
233,839 lots, the smallest volume since August 2007. <0#MCU-FUT-OI>

Analyst Andrey Kryuchenkov at VTB Capital in London expects the rebound in
copper and aluminium prices will fade next week in the absence of stimulus
measure announcements from central bankers.

"I personally think that copper and aluminium will stall here and probably
come back to the July lows simply because I don't think, and economists also
don't believe, that QE3 is warranted in any way," he said.

On aluminium, RBC Capital said in a note that price-induced shutdowns by
aluminium producers such as Bosnia's Aluminij Mostar could erode a market
surplus forecast for this year, potentially paving the way for a price recovery.

"The analyst community is still working on the numbers, but (such) closures
could be enough to seriously erode the previously expected surplus," it said.

"Add that to the already tight physical market owing to load out queues at
LME warehouses and you have a recipe for a decent short-covering rally," it said
in a note.

Bosnia's top exporter, aluminium smelter Aluminij Mostar, will close 12.5
percent of its smelting capacity due to lower metal prices and higher power
costs, and could cut more in September.

The roughly 45 million tonne a year aluminium market is seen in a 500,000
surplus this year, according to a Reuters poll earlier this month. MKTBAL-ACL

Benchmark aluminium did not trade at the close, but was last traded
at $1,903 a tonne in after-hours business, just shy of its intraday high of
$1,904.

Metal Prices at 1822 GMT

Metal Last Change Pct Move End 2011 Ytd Pct

move
COMEX Cu 342.50 3.15 +0.93 343.60 -0.32
LME Alum 1895.00 16.50 +0.88 2020.00 -6.19
LME Cu 7564.00 94.00 +1.26 7600.00 -0.47
LME Lead 1923.00 38.00 +2.02 2035.00 -5.50
LME Nickel 15880.00 -10.00 -0.06 18710.00 -15.13
LME Tin 18115.00 365.00 +2.06 19200.00 -5.65
LME Zinc 1859.00 44.00 +2.42 1845.00 0.76
SHFE Alu 15480.00 130.00 +0.85 15845.00 -2.30
SHFE Cu* 54960.00 530.00 +0.97 55360.00 -0.72
SHFE Zin 14630.00 170.00 +1.18 14795.00 -1.12
** Benchmark month for COMEX copper
* 3rd contract month for SHFE AL, CU and ZN
SHFE ZN began trading on 26/3/07

(Additional reporting by Eric Onstad in London and Melanie Burton in Singapore;
editing by James Jukwey, Keiron Henderson and Marguerita Choy)