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London - Gold prices slipped from record highs on Monday and silver was on track for its biggest one-day loss since December 2008 after news that al-Qaeda leader Osama bin Laden was killed in a US-led operation in Pakistan.
Spot gold fell to nearly $1 540 an ounce after earlier hitting a fresh record high at $1 575.79. By 1044 GMT it had recovered to $1 556.20 an ounce against $1 563.65 late in New York on Friday.
Silver was bid at $45.36 an ounce against $47.80, having earlier fallen as low as $43.04.
Oil and gold fell as news of the death stripped out some of the risk premium that has been underpinning commodity prices, while the dollar rebounded from three-year lows, further pressuring gold, and stock markets climbed.
Silver tumbled as much as 10%, its steepest fall since late 2008, hit by a stronger dollar, increased margins for futures trading and a technical overhang after a 170% rally over the last 12 months to a record high last week.
"News about Osama and the 13% margin increase - the second in a week - hit the market at the worst possible time," said Ole Hansen, senior manager at Saxo Bank. "Also, (there was) news Friday evening that professionals scaled back silver exposure by 26% as of last Tuesday."
"We are seeing volatility at an unprecedented level here and the fight between the bulls and bears has entered an interesting stage," he said, adding; "I like gold. Just a switch from silver to gold could lend support."
The CME Group Inc, parent of the Chicago Board of Trade, said on Thursday it would raise maintenance margins for COMEX 5000 Silver futures by 13.2% to $10 750 per contract from $9 500 effective Friday, April 29.
This is the second rise this week following a 9.2% margin increase on Monday, making it more expensive for silver speculators to trade in.
Data from the Commodity Futures Trading Commission showed speculators cut bullish bets in COMEX silver futures and options to the lowest since early February.
Spectacular fall
Some traders put down silver's spectacular fall to an unwinding of a short gold-silver ratio position, compounded by automated stop-loss orders.
The gold-silver ratio, used to measure the number of silver ounces needed to buy an ounce of gold, rebounded to about 35 from below 32, its lowest level since the early 1980s.
"There is nothing from a fundamental perspective to cause a fall this large. Silver has been the most rapidly appreciating of the metals in the past months and if there was one that looked a bit frothy it was silver," said Ben Westmore, commodities economist at National Australia Bank.
"This is mostly technical. We expect silver to be in relatively close step with gold and while both have risen strongly, silver may have moved a bit too far ahead."
Markets across large parts of Asia and much of Europe were closed for May Day and Labour day holidays, reducing the number of market participants and making for volatile trade.
While gold initially fell more than $5 an ounce after news of bin Laden's death, traders expect its bull trend to remain intact given the macroeconomic and political environment.
The metal remains supported by concerns over the financial health of some euro zone economies, worries over the US budget deficit, and ultra-accommodative US monetary policy.
While the stronger dollar is keeping the metal under pressure, gold has shown in recents years that it can rise in line with the dollar if other factors are supportive enough.
Platinum was at $1 856 an ounce versus $1 864.25, while palladium was at $780.98 versus $789.35.
