* Gold's bullish target at $1,518 -technicals [
]* Coming Up: US Unemployment claims weekly; 1230 GMT (Updates prices)
By Lewa Pardomuan
SINGAPORE, April 21 (Reuters) - Bullion powered to a lifetime high for a fifth consecutive session on Thursday on a sharply weaker dollar, while lingering tensions in the Arab world, worries about the euro zone crisis and U.S. fiscal health offered additional support.
Silver roared to its highest in more than three decades as it tracked a rally in gold, which was also spurred by a threat of a downgrade to the United States' triple-A credit rating. The gold-silver ratio -- the number of silver ounces needed to buy an ounce of gold -- was at its lowest since 1983.
Spot gold rose to a record high of $1,508 an ounce and stood at $1,505.86 an ounce by 0431 GMT, up $7.71 an ounce. U.S. gold futures <GCcv1> also hit a lifetime high at $1,508.9 an ounce.
"The U.S. effectively lost its triple-A rating in the eyes of investors that really matter quite some time ago, back when gold broke $1,000 an ounce," said Fat Prophets commodities analyst David Lennox.
"We don't think America's perceived rating will improve anytime soon and this is the driving force behind our expectation of gold's continued price strength. Our next target for gold is $1,590 an ounce."
A bullish target at $1,518 per ounce remains intact for spot gold as indicated by an inverted head-and-shoulders pattern and its wave pattern, said Wang Tao, a Reuters market analyst for commodities and energy technicals.
Spot silver rose as high as $45.93 an ounce, its strongest since 1980, when the Hunt Brothers of Texas cornered the silver market.
The dollar tumbled to its lowest in three years against a basket of currencies as the prospect that U.S. interest rates would remain at record lows prompted investors to flock back to higher-yielding currencies.
The dollar index fell 0.4 percent from late New York trade to 74.094 and sank as far as 74.058, the lowest since August 2008 -- just before it surged during the Lehman Brothers collapse as investors rushed for safe havens.
The physical market in Asia saw limited selling of scrap as investors waited for bigger gains. Dealers noted physical buying from India in the previous session ahead of a key religious festival, suggesting that consumers had no choice but to buy bullion at higher prices.
India, the world's largest gold consumer, celebrates Akshaya Tritiya on May 6, when consumers buy gold to invoke prosperity.
"Sentiment is still bullish, we can say. The dollar is weakening and there is no solution to the situation in Libya. There's a downgrade in the U.S. rating and there's still uncertainty in the euro zone. It's messy around the world," said Ronald Leung, director of Lee Cheong Gold Dealers in Hong Kong.
"But I think gold is rising too fast. We are waiting for some kind of correction in the near future, hopefully next week."
France promised Libyan rebels on Wednesday it would intensify air strikes on Muammar Gaddafi's forces and send military liaison officers to help them as fighting raged in Misrata. [
]Gaddafi's government is circumventing international sanctions to import gasoline to western Libya by using intermediaries who transfer the fuel between ships in Tunisia. [
]Brent crude climbed above $124 a barrel on Thursday as U.S. crude inventories fell unexpectedly last week and a sharply weaker dollar triggered a rush into riskier assets.
Precious metals prices 0431 GMT Metal Last Change Pct chg YTD pct chg Turnover Spot Gold 1505.86 7.71 +0.51 6.09 Spot Silver 45.62 0.42 +0.93 47.83 Spot Platinum 1802.50 11.35 +0.63 1.98 Spot Palladium 763.72 11.97 +1.59 -4.48 TOCOM Gold 3989.00 -19.00 -0.47 6.97 37155 TOCOM Platinum 4804.00 -2.00 -0.04 2.30 8806 TOCOM Silver 120.40 2.20 +1.86 48.64 3577 TOCOM Palladium 2033.00 43.00 +2.16 -3.05 316 Euro/Dollar 1.4568 Dollar/Yen 82.20 TOCOM prices in yen per gram. Spot prices in $ per ounce.
(Additional reporting by Rujun Shen in SINGAPORE and Jim Regan in SYDNEY; Editing by Clarence Fernandez)
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