METALS-Copper up on weak dollar, ahead of Fed statement

* Investors to seek clues from Fed statement

* Weaker dollar supports, but demand doubts linger

* Dominant tin position resurfaces

(Adds closing prices)

By Pratima Desai and Michael Taylor

LONDON, Nov 4 (Reuters) - Copper rose on Wednesday as the dollar fell ahead of a statement from the U.S. Federal Reserve, which is expected to say interest rates will remain low for a long time to support the world's largest economy.

Benchmark copper MCU3 on the London Metal Exchange ended up at $6,570 a tonne from $6,460 at the close on Tuesday. The metal used in power and construction, hit a near two-week low at $6,372.25 on Tuesday.

Markets expect the Fed will leave rates at ultra-low levels after its two-day meeting later on Wednesday. [INT/RATE]

But investors will scrutinise the statement for sign posts to the future direction of monetary policy in the United States. [nFEDAHEAD] [ID:nN04432358]