* Gold climbs further on oil but resistance levels intact
* Oil firms above $118 on supply fears
* Investors await second-quarter U.S. GDP data (Updates prices, adds quotes)
By Lewa Pardomuan
SINGAPORE, Aug 28 (Reuters) - Gold rose further on Thursday on safe-haven buying as oil continued its ascent and on a sliding dollar, but it would have to crack key resistance levels to sustain the uptrend.
"Gold is still capped by the big resistance at $837, and above at $846. I don't think much would happen ahead of the U.S. long holiday weekend," said Peter Tse, a dealer at Scotia Mocatta in Hong Kong, referring to Monday's Labor Day holiday.
Physical buying ahead of the festive season in Asia has helped gold rebound more than 7 percent since tumbling to nine-month lows around $773 an ounce in mid-August.
Gold <XAU=> firmed to $831.30/832.30 an ounce from $826.05/827.45 an ounce late in New York on Wednesday, when it gained more than $3 an ounce.
Oil <CLc1> rose for afourth straight session to stay above $118 a barrel on Thursday on concerns Tropical Storm Gustav will intensify into amajor hurricane as it moves towards energy facilities in the Gulfof Mexico. [
]"Perhaps oil could lead gold higher here, and on the oil side, I think Gustav is something we should watch. For the dollar, we will probably have to focus on tonight's U.S. GDP data for direction," said Adrian Koh, an analyst at Phillip Futures in Singapore.
The euro edged up to $1.4781 <EUR=>, recovering from a six-month low of $1.4570 hit on Tuesday, after comments by a European Central Bank official the previous day scaled back speculation about an ECB rate cut. [
]The U.S. economy probably performed much better in the second quarter than previously thought, as improvement in the trade balance combined with government stimulus to buoy growth, a Reuters poll showed. [
]Spot platinum <XPT=> rose to $1,436.00/1,456.00 an ounce from $1,434.00/1,454.00 late in New York.
Higher gold prices spurred speculative buying in platinum but investors remained cautious after the metal sank to an 11-month low around $1,296 last week. Automakers were also on the sidelines.
"Platinum seems to be edging higher, but I don't think we are clearly out of the downside yet," said Koh of Phillip Futures.
"If platinum can clear the $1,450 level and perhaps make a move to the $1,500 level, then that scenario may change a little."
The bulk of the world's platinum is used by automakers in autocatalyst systems that scrub exhaust fumes of dangerous and environmentally damaging chemicals. Platinum prices are well below a lifetime high of $2,290 hit in early March.
Spot palladium <XPD=> inched down to $287.50/295.50 an ounce from $288.50/296.50 an ounce. Silver <XAG=> firmed to $13.60/13.66 an ounce from $13.49/13.55 an ounce late in New York.
The new benchmark contract on the Tokyo Commodity Exchange, August 2009 <JAUc6>, rose 14 yen per gram to 2,944 yen per gram.
New York gold futures <GCZ8> added $3.2 an ounce to $837.20. Precious metals prices at 0349 GMT Metal Last Change Pct chg YTD pct chg Turnover Spot Gold 832.35 6.45 +0.78 -0.04 Spot Silver 13.60 0.17 +1.27 -7.92 Spot Platinum 1437.00 3.50 +0.24 -5.46 Spot Palladium 287.50 -1.00 -0.35 -21.88 TOCOM Gold 2945.00 15.00 +0.51 -3.76 15026 TOCOM Platinum 5047.00 47.00 +0.94 -5.47 8900 TOCOM Silver 483.70 -1.90 -0.39 -10.59 671 TOCOM Palladium 1043.00 -5.00 -0.48 -22.80 348 Euro/Dollar 1.4784 Dollar/Yen 109.22 TOCOM prices in yen per gram, except TOCOM silver which is priced in yen per 10 grams. Spot prices in $ per ounce. (Editing by Michael Urquhart)