* Sudden dollar drop drives up gold in thin trade; UK shut
* Gold-silver ratio near 46-month low
* COMING UP: U.S. consumer confidence, Dec; 1500 GMT (Updates prices)
NEW YORK, Dec 28 (Reuters) - Gold prices jumped nearly 1.5 percent on Tuesday, topping $1,400 an ounce for the first time in two weeks as the dollar sank and dealers anticipated an unprecedented eleventh annual rise next year.
After several weeks of trendless trade, gold staged its biggest one-day gain since Dec. 3 as many investors bet that economic uncertainty and currency diversity would fuel more demand from investors and banks. Prices are on track to rise 28 percent this year, a record 10th consecutive annual gain.
"The end of the year loss of confidence in the dollar value has brought gold players back into the market on the long side. It's hard to say more than that," said George Nickas, a gold broker at FC Stone in New York.
After modest early gains, spot gold <XAU=> shot more than $20 an ounce higher in early U.S. trade, hitting a session peak of $1,405.15, the highest since Dec. 14. It was up 1.34 percent at $1,402.20 by 9:34 a.m. EST (1434 GMT).
U.S. gold futures for February delivery <GCG1> rose 1.5 percent, or $20.60, to $1,403.50. Trading volume picked up from Monday's lackluster activity, with over 55,000 lots already traded, nearly one-third of this year's average. But activity was still subdued by the UK holiday and lack of official gold fixings.
The dollar's abrupt decline on Tuesday aided gold, which is often used as a hedge against greenback weakness or inflation. The dollar index <.DXY> dropped 0.6 percent, its biggest decline in two weeks, as corporate buying lifted the Swiss franc and key buy-stops helped the euro recover in a thin market.
Independent investor Dennis Gartman, who has at times been cautious on gold's rally this year, said he was now expanding his position by buying bullion in U.S. dollar terms as central banks stock up. [
]"We are long of gold in non-U.S. dollar terms, and now we wish to add to the position by buying gold in U.S. dollar terms," he said in his daily Gartman Letter.
"This is consistent with our thesis that gold is, at the margin, becoming a reservable asset of greater interest by the reserve banks of Asia, Africa and likely also South America. At the margin, they are increasing their gold holdings at the expense firstly of the EUR and now of dollars."
Next year is expected to mark the end of a lengthy trend of official sector bullion sales, with central banks globally turning net buyers for the first time in decades. Investors are also expected to continue piling in.
Spot gold <XAU=> is biased to rise to $1,410 per ounce as an upward wave "c" is unfolding towards an eventual target at $1,430, said Wang Tao, a Reuters market analyst. [
](Graph, 24-hour gold technical outlook:
http://link.reuters.com/wet83r)
"Gold is riding high on its own, but with the euro/dollar bid, it's even better," said a Singapore-based trader. "Asians have been non-stop buyers, and want to load up when gold is some 40 bucks off the all-time highs."
Spot silver <XAG=> led gains, rising 1.5 percent to $29.70 an ounce, up 76 percent so far this year.
The gold-silver ratio, used to measure how many ounces of silver is used to buy an ounce of gold, stood at 47.2, near its 46-month low of 47.1 hit last week.
The ratio has been on a steady decline since August this year, when silver started its spectacular rally. Spot prices had risen by near 70 percent in the past five months, compared to a 19-percent ascent in gold over the same period.
(Graphic, gold-silver ratio:
http://link.reuters.com/vys83r) Prices at 9:44 a.m. EST (1444 GMT)
LAST NET PCT YTD
CHG CHG CHG US gold <GCG1> 1402.50 20.00 1.4% 27.9% US silver <SIH1> 29.760 0.520 1.7% 76.7% US platinum <PLF1> 1751.00 15.50 0.9% 19.0% US palladium <PAH1> 778.20 11.10 1.5% 90.3% Gold <XAU=> 1402.10 18.44 1.3% 27.9% Silver <XAG=> 29.72 0.46 1.6% 76.5% Platinum <XPT=> 1748.49 16.99 1.0% 19.3% Palladium <XPD=> 774.47 7.97 1.0% 91.0% (rujun.shen@thomsonreuters.com +65 6870-3726)