* Gold posts modest gains in quiet trade
* The dollar drop versus euro helps, oil fall caps rise
* Holiday thinned markets keep volumes light (Recasts, updates prices, market activity to New York close; adds second byline, dateline, previously LONDON)
By Carole Vaporean and Humeyra Pamuk
NEW YORK/LONDON, Dec 22 (Reuters) - Gold climbed around 1 percent in thin trade on Monday as the dollar lost ground against the euro, but tumbling oil prices capped the gains, traders and analysts said.
Spot gold <XAU=> was fetching $845.90 an ounce at 4:02 p.m. EST (2102 GMT) versus $837.60 an ounce late in New York on Friday, when it dropped nearly 3 percent.
On the COMEX division of the New York Mercantile Exchange, February <GCG9> finished $9.80, or 1.17 percent, higher at $847.20 an ounce. The contract set an inside range between $836.70 and $853.0 an ounce.
"The dollar's definitely helping gold," said analyst Eugen Weinberg at Commerzbank in Germany.
The euro added 0.5 percent to $1.3994 <EUR=> after earlier hitting a session peak of $1.4123 in holiday-thinned trade.
"Gold is following the dollar at the moment. And the dollar's holding fairly steady against the euro. So you're going to see gold holding steady," said one New York dealer.
Trading volume was light, traders said, with many market players leaving for the Christmas holiday.
"We're going to see some volatility as people exit their positions. In all these markets you see big drops or big climbs from out of nowhere. It could just be people wanting to go flat so they can enjoy their vacations," a New York dealer said.
Dollar-denominated bullion, which touched a two-month high of $881.20 an ounce last week, tends to move opposite the dollar. A weaker U.S. currency makes gold cheaper for overseas investors.
Switzerland's Zurich Cantonal Bank (ZKB) said gold investment in its exchange-traded fund rose to 3.128 million ounces in the week ending Dec. 19, compared to 3.082 million ounces in the previous week.
UNDER PRESSURE
More gloomy news on the global economy is expected this week -- with revised U.S. third-quarter GDP on Tuesday and November U.S. personal spending on Wednesday -- pointing to a long recession ahead.
Spot platinum <XPT=> was at $845.00 an ounce versus $847.00 an ounce, and spot palladium was slightly lower at $171.0 an ounce from $173.00. Silver climbed to $10.80 an ounce from $10.81.
Russia, a major supplier of platinum group metals (PGMs) used in industries ranging from car-making to jewellery, may face delays in exports next year due to red tape, the former monopoly export agency said.[
] (Additional reporting by Humeyra Pamuk in London)