* Gold extends losses on falling oil, hits 1-week low
* Platinum drops 2 percent on fears of falling demand
(Updates prices)
SINGAPORE, Sept 2 (Reuters) - Gold fell to its lowest level in a week on Tuesday as speculators ditched some holdings following a sharp drop in oil prices and a rally in the U.S. dollar, which reduced the metal's appeal as an alternative investment.
Platinum also fell to a one-week low on concerns about demand for autocatalysts due to poor car sales and a slowing U.S. economy. Autocatalysts, used to clean exhaust fumes, account for more than 50 percent of global platinum demand.
Gold <XAU=> fell to $813.45/814.45 an ounce from $817.15/818.75 an ounce late in London. New York markets were closed on Monday for the Labor Day holiday.
Gold has lost more than 20 percent in value since spiking to all-time high of $1,030.80 in March, mainly driven by profit taking, oil's falls from record highs and a rebounding dollar.
"There's panic selling," said Kazuhiko Saito of Interes Capital Management in Tokyo, adding that gold could potentially fall to $800. "Japanese sales of automobiles in August were below 200,000 cars, so it's very bad figure. Platinum price is under pressure. It's a very bearish factor," he said.
Saito pegged platinum's downside target at $1,350 an ounce - a level last seen in late August.
Spot platinum <XPT=> dropped to $1,409.50/1,429.50 an ounce from $1,439.00/1,451.00 late in London, having hit an intraday low of $1,407 an ounce.
Automobile sales in Japan, excluding 660cc minivehicles, tumbled 14.9 percent in August year-on-year to 193,902 vehicles, the Japan Automobile Dealers Association. Sales for August fell short of 200,000 vehicles for the first time in 37 years. [
]Platinum prices have taken a dramatic turn since spiking to a record high above $2,000 an ounce in March, losing much of their gains to profit taking and fears of falling demand.
The benchmark platinum contract on the Tokyo Commodity Exchange, August 2009 <JPLc6>, fell 121 yen per gram to 4,864 yen, with weaker oil prices adding to the selling pressure. Oil <CLc1> futures steadied above $111 a barrel after slumping more then $4 on Monday as concerns Hurricane Gustav would cause lasting damage to the U.S. oil sector eased after the storm weakened before hitting the Louisanacoast. [
]The dollar index <.DXY> climbed 0.8 percent to 77.75 after hitting an eight-month high of 77.823.
New York gold futures <GCZ8> lost $16.30 an ounce to $818.90.
Spot palladium <XPD=> fell to $288.50/296.50 an ounce from $297.00/305.00 an ounce. Silver <XAG=> edged down to $13.31/13.38 an ounce from $13.40/13.46 an ounce late in London. Precious metals prices at 0041 GMT Metal Last Change Pct chg YTD pct chg Turnover Spot Gold 813.25 -3.85 -0.47 -2.34 Spot Silver 13.32 -0.09 -0.67 -9.82 Spot Platinum 1408.00 -31.00 -2.15 -7.37 Spot Palladium 288.50 -9.50 -3.19 -21.60 TOCOM Gold 2852.00 -51.00 -1.76 -6.80 19341 TOCOM Platinum 4861.00 -124.00 -2.49 -8.95 7712 TOCOM Silver 467.30 -10.80 -2.26 -13.62 363 TOCOM Palladium 1028.00 -52.00 -4.81 -23.91 376 Euro/Dollar 1.4581 Dollar/Yen 108.29 TOCOM prices in yen per gram, except TOCOM silver which is priced in yen per 10 grams. Spot prices in $ per ounce.
(Reporting by Lewa Pardomuan; Editing by Kim Coghill)