(Updates to late afternoon)
By Chikafumi Hodo
TOKYO, Feb 7 (Reuters) - Platinum advanced to a record high on Thursday as concerns over supply problems in South Africa attracted strong demand from investors, with a sharp rise in Tokyo platinum futures providing upward momentum.
The benchmark platinum futures contract for December delivery <0#JPL:> on the Tokyo Commodity Exchange jumped 2.7 percent to a record-high 5,989 yen a gram.
Firmness in platinum prices boosted cash gold <XAU=> by nearly 1 percent to $908 an ounce, but the spot market was fairly thin as many Asian market participants were away for the Lunar New Year holiday.
As of 0727 GMT, cash platinum <XPT=> was trading at a record high of $1,820/1,827 an ounce, breaking through the previous all-time high of $1,819 hit on Wednesday.
"Platinum is bullish as all focus is on supply worries in South Africa with power cuts and floods and so on," said Shuji Sugata at Mitsubishi Corp Futures and Securities in Tokyo.
"Concerns over supplies have been keeping lease rates at high levels and providing overall support."
The white precious metal has been drawing huge fund inflows since the start of the year, sending it up by nearly 20 percent.
South Africa's government appealed to mining companies for help in cutting power consumption on Tuesday to ease a power crisis caused by the failure of electricity generation to match economic growth. [
]Japanese investors have been flocking into the market, although they were careful about building up new buy positions.
The December platinum contract on the Tokyo Commodity Exchange <0#JPL:> was up 153 yen, or 2.6 percent, at 5,984 yen a gram as of 0727 GMT.
Open interest in TOCOM platinum was at 71,599 contracts on Wednesday, down about 26 percent from the start of the year.
Sharp volatility in TOCOM platinum and currencies have made investors reluctant about taking new buy positions on rallies, traders said.
Firmness in platinum prices has pushed up its sister metal, palladium.
Palladium <XPD=> rose to $420/425 an ounce from $416/421 on Wednesday. It had reached a six-year high of $426.50 on Tuesday.
Cash gold <XAU=> was trading at $907.80/908.70 an ounce, up from $900.40/901.10 late in New York on Wednesday.
However, Sugata said gold appeared to be losing momentum and struggling to rise strongly above $900.
"It's tough to take fresh positions as uncertainties in financial markets are spreading with stock prices losing ground again. Also the market wants to the see the outcome of the G7 meeting before taking new positions in gold."
The Group of Seven finance ministers and central bank governors are expected to debate how recent market turmoil and a U.S. economic slowdown could affect the world economy when they meet in Tokyo on Saturday.
COMEX gold futures extended gains in Asia after rising 1.7 percent in New York on Wednesday. The April contract <GCJ8> was up $6.6 or 0.7 percent at $911.6 from the New York settlement. Precious metals prices at 0722 GMT Metal Last Change Pct chg YTD pct chg Turnover Spot Gold 907.60 7.20 +0.80 8.99 Spot Silver 16.64 0.13 +0.79 12.66 Spot Platinum 1820.00 10.00 +0.55 19.74 Spot Palladium 421.00 5.00 +1.20 14.40 TOCOM Gold 3133.00 76.00 +2.49 2.39 64177 TOCOM Platinum 5978.00 147.00 +2.52 11.97 46328 TOCOM Silver 573.80 14.20 +2.54 6.06 758 TOCOM Palladium 1472.00 38.00 +2.65 8.96 1689 Euro/Dollar 1.4627 Dollar/Yen 106.53 TOCOM prices in yen per gram, except for silver which is in yen per 10 grams, spot prices in $ per ounce. (Reporting by Chikafumi Hodo)