* Gold up over 5 pct for Q3 on weak dlr, easing worries
* Gold-to-silver ratio hits 11-month low
* IMF sold 18.5 tonnes gold in Aug. vs 16.9 tonnes in July
* Coming up: U.S. August personal income due Friday
(Recasts, adds comments, updates prices, adds second byline/dateline)
By Frank Tang and Amanda Cooper
NEW YORK/LONDON, Sept 30 (Reuters) - Gold dipped on profit-taking on Thursday after rallying to record highs, racking up its eighth consecutive quarterly gain as the Federal Reserve stood ready to pump more cash into the U.S. economy to stave off double-dip recession.
Having hit its 11th record high in 13 trading sessions, gold posted a 5 percent gain for the month and the likelihood of more U.S. monetary easing to support the economy lifted silver as well.
Two measures of U.S. regional business activity beat expectations and a drop in weekly jobless claims supported the view that economic activity picked up in the third quarter, which boosted the dollar against a basket of major currencies and in turn weighed on gold. [
]However, this was unlikely to change the view that the world's largest economy is flagging, which bolstered gold's safe-haven status.
"In the United States, you've got a gradual grind on the economic side, so low GDP growth, the Fed likely to keep rolling over its balance sheet for a while and not increasing interest rates," said Bank of America-Merrill Lynch analyst Michael Widmer.
"In that environment, you have a lot of uncertainty and people are looking to increase their gold holdings."
Spot gold <XAU=> scaled a record high of $1,315.80 an ounce and eased 0.1 percent at $1,307.85 at 1:28 p.m. EDT (1728 GMT). U.S. gold futures for December delivery <GCZ0> fell $3.10 to $1,307.20.
COMEX gold open interest eased but held near Tuesday's record at 619,408 lots, and the exchange estimated final gold volume at almost 150,000 lots, nearly 30 percent higher than its 30-day average, preliminary Reuters data showed.
Bullion investors took profits on the last trading day of the third quarter, as the dollar index turned higher after falling to an eight-month low.
There is market talk that the Fed, the Bank of England and the Bank of Japan would limit rises in interest rates, which would prove a positive for gold, which tends to benefit in an environment of loose monetary policy.
"With quantitative easing, it is probably no longer a question of if, but when," said Daniel Briesemann, an analyst at Commerzbank.
"The other thing in the mind of investors is that there might be a war (of) currency devaluations in some of the main world currencies like the dollar, yen, and so on," he said. "That is supportive for gold as well."
A raft of U.S. economic data on Thursday showed claims for unemployment benefit fell last week, while economic growth was a touch higher in the second quarter than previously thought.
GOLD DRIVEN BY DOLLAR WEAKNESS?
Gold benefited as the dollar is on track for its biggest quarterly drop since the second quarter of 2002 against a basket of six other currencies, down more than 8 percent. The euro is up almost 12 percent, also its best quarterly performance since 2002. [
] <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Graphic on gold's performance relative to other commodities http://r.reuters.com/was95p Graphic in gold's performance vs other assets: http://r.reuters.com/cek95p ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>Strength in gold prices also helped lift silver to its highest level since 1980, palladium to a 2-1/2 year high and platinum to its strongest since May.
Silver <XAG=> hit a fresh 30-year high at $22.07 an ounce, and was trading down 0.6 percent at $21.75 an ounce, yet still on track for its biggest monthly gain since May 2009.
The metal has climbed on the back of rising gold prices, but continues to outperform its rival. The gold-silver ratio -- how many ounces of silver are needed to buy an ounce of gold -- hit a low at 59.7 on Thursday, its weakest since last October.
Holdings of the world's largest silver-backed exchange-traded fund, the iShares Silver Trust <SLV>, rose to a record 9,786.47 tonnes by Wednesday, the trust said, showing healthy investment appetite for the metal. [
]Platinum <XPT=> hit a four-month high at $1,664.00 an ounce and rose 0.5 percent at $1,653.50, while palladium <XPD=> was also trading up 0.5 percent at $566.00, having earlier touched its highest since March 2008 at $581.50 an ounce. Prices at 2:01 p.m. EDT (1801 GMT)
LAST NET PCT YTD
CHG CHG CHG US gold <GCZ0> 1307.40 -2.90 -0.2% 19.3% US silver <SIZ0> 21.770 -0.182 -0.8% 29.2% US platinum <PLF1> 1658.40 1.80 0.1% 12.7% US palladium <PAZ0> 568.20 0.90 0.2% 39.0% Gold <XAU=> 1306.10 -2.70 -0.2% 19.1% Silver <XAG=> 21.75 -0.12 -0.5% 29.2% Platinum <XPT=> 1653.00 7.25 0.4% 12.8% Palladium <XPD=> 565.50 2.05 0.4% 39.5% Gold Fix <XAUFIX=> 1307.00 -4.00 -0.3% 18.4% Silver Fix <XAGFIX=> 22.07 20.00 0.9% 29.9% Platinum Fix <XPTFIX=> 1662.00 12.00 0.7% 13.4% Palladium Fix <XPDFIX=> 573.00 5.00 0.9% 42.5% (Additional reporting by Jan Harvey in London; Editing by Marguerita Choy)