* Spreading Middle East unrest spurs safety demand for gold
* Palladium hits 10-yr high, silver at 31-yr peak
* Supply concerns, industrial demand to underpin PGMs (Adds comment, graphic; updates prices)
By Chikako Mogi
SINGAPORE, Feb 21 (Reuters) - Gold rose to a seven-week high on Monday as spreading unrest in the Middle East burnished the metal's appeal as a safe-haven asset, while prices of silver and palladium hit historic highs on expectations of growing industrial demand.
Gold added to a weekly gain of nearly 3 percent last week and was poised for further upside on fresh news from North Africa and the Middle East, where revolutions which deposed the presidents of Tunisia and Egypt have inspired protests across the region, threatening the grip of long-entrenched autocratic leaders.
Spot gold climbed to a seven-week high of $1,396.1, before easing slightly to $1,395.9 per ounce as of 0658 GMT. Gold is poised for a sixth straight session of gains.
U.S. markets are closed on Monday for a holiday.
U.S. gold futures for April delivery climbed 0.7 percent to $1,395.90 per ounce, compared to Friday's settlement at $1,388.60.
"With the unrest in the Middle East and North Africa, dealers couldn't leave for a long weekend with short positions, and this reflects investor sentiment for a flight to safety," said Yuichi Ikemizu, Tokyo branch manager for Standard Bank, adding that gold prices were likely to keep inching higher.
Spot gold may rise to its Jan. 3 high of $1,423.57 per ounce as it has ignored bearish signals and continued to shoot up, says Wang Tao, a Reuters market analyst for commodities and energy technicals.
The world's largest gold-backed exchange-traded fund, the SPDR Gold Trust , said holdings fell to 1,223.098 tonnes by Feb. 20, its lowest in nine months, from 1,224.008 tonnes on Feb. 15.
Traders said there was slightly higher demand for gold bars in the Middle East, mainly due to the unrest.
SILVER HITS 31-YEAR HIGH
Expectations of growing industrial demand on an improving world economy and a rally in the overall precious metals market also helped hoist silver to its highest level since 1980.
Spot silver rose to its 31-year high at $33.18 an ounce.
The silver market has become overbought, as the Relative Strength Indicator rose to a three-month high near 77. An RSI reading above 70 indicates an overbought market.
"Cash silver is expensive now compared to the forward market," said a Hong Kong-based trader, "There might be a squeeze going on."
Forward rates on Reuters pages indicated at -0.36, -0.37, -0.37, -0.40 and -0.37 percent for one, two, three, six and 12 months respectively.
A deepening backwardation -- which means futures are cheaper than spot prices -- reflects tightness in the market.
The gold-silver ratio, used to measure how many ounces of silver are needed to buy one ounce of gold, dropped to a 13-year low of 42.18.
Holdings in the world's largest silver-backed exchange-traded fund, iShares Silver Trust , rose to 10,519.05 tonnes by Feb. 18 from 10,438.56 tonnes on Feb. 17.
Platinum gained 0.5 percent to $1,842.25 an ounce while palladium hit a 10-year high of $855.50 in early trade.
Traders said platinum and palladium may see further gains on a solid demand outlook and supply concerns.
Precious metals prices 0658 GMT Metal Last Change Pct chg YTD pct chg Volume Spot Gold 1395.90 7.32 +0.53 -1.66 Spot Silver 33.17 0.71 +2.19 7.49 Spot Platinum 1842.25 8.75 +0.48 4.23 Spot Palladium 849.66 1.41 +0.17 6.27 TOCOM Gold 3739.00 23.00 +0.62 0.27 43860 TOCOM Platinum 4977.00 15.00 +0.30 5.98 9075 TOCOM Silver 87.70 3.40 +4.03 8.27 2597 TOCOM Palladium 2293.00 24.00 +1.06 9.35 430 COMEX GOLD APR1 1396.80 8.20 +0.59 -1.73 12917 COMEX SILVER MAR1 33.17 0.87 +2.69 7.19 6129 Euro/Dollar 1.3679 Dollar/Yen 83.17 TOCOM prices in yen per gram. Spot prices in $ per ounce. COMEX gold and silver contracts show the most active months
(Additional reporting by Rujun Shen in SINGAPORE; Editing by Clarence Fernandez)
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