* Euro weakens on rate cut expectations, weak PMIs
* Silver tumbles 10 percent after U.S. open
* Platinum, palladium slip 8 pct on demand fears
(Updates throughout, adds comment)
By Jan Harvey
LONDON, Dec 1 (Reuters) - Precious metals prices fell across the board on Monday, with silver tumbling 10 percent, as oil fell in the wake of OPEC's decision to defer a production cut, and the dollar strengthened against the euro.
Gold slipped more than 4 percent to its weakest level since Nov 21, while platinum and palladium tumbled 8 percent each as investors fretted over the outlook for demand.
Spot gold <XAU=> hit a session low of $776.80 an ounce and was quoted at $782.80/785.30 at 1445 GMT, down from $813.00 an ounce late on Friday. Silver <XAG=> fell to a low of $9.15 and was later trading at $9.35/9.43, down from $10.26 on Friday.
"Gold was already weaker this morning in Asia on falling oil prices, and as crude oil accelerated its decline in European trading and the start of trading in the US, gold came under pressure," Dresdner Kleinwort consultant Peter Fertig said.
"Furthermore European PMIs came in weaker than expected... so pressure on the euro increased and stock markets came under heavy selling pressure, which is another negative factor for the precious metals."
Oil prices fell more than 7 percent after OPEC opted to wait until mid-December to cut output at a meeting in Egypt at the weekend. [
]Gold tends to move in line with crude because it is bought as a hedge against oil-led inflation and weaker oil prices undermine interest in commodities as an asset class.
The dollar, the other main external driver of gold, firmed 0.8 percent against the euro amid expectations of a half-point rate cut from the European Central Bank on Thursday. [
]Euro zone manufacturing activity fell to a record low in November and the outlook remains grim, private sector data showed. [
]A spate of U.S. economic data due this week is likely to affect currency markets and the precious metals.
"The prime focus would be on the U.S. non-farm payrolls on Friday which is likely to fall negative for the 11th straight month and by the most since September 2001," said Pradeep Unni, a senior analyst at Richcomm Global Services.
PLATINUM TUMBLES
Platinum slipped nearly 8 percent as weak Japanese auto sales data emphasised poor demand from carmakers.
Spot platinum slipped to a session low of $798.50 an ounce, and was later trading at $804.50/824.50, against $871.50 an ounce late on Friday. Sister metal palladium fell 8 percent to $170.50/178.50 from $186.50.
Worries over falling car sales has already led platinum to slump some 65 percent since it hit an all-time high of $2,290 an ounce in March.
Weak Japanese car sales data on Monday spurred fresh selling. Sales fell 27.3 percent in November from a year before, the Japan Automobile Dealers Association said on Monday. [
]Falling U.S. car sales were largely priced into the market, but the same trend elsewhere could push prices down further, traders said.
"The market is now reacting to uncertainty about how the Chinese market will fare going forwards, and the fact that Japanese automakers, who were regarded as best managed and strongest financially, are clearly facing the same problems as all the others," Tom Kendall, precious metals strategist at Mitsubishi Corporation, said. (Editing by Sue Thomas)