LONDON, March 28 (Reuters) - Copper held firm on Wednesday on expectations of 
robust demand from China, despite U.S. Federal Reserve Chairman Ben Bernanke's 
comments about the U.S. economy, while tin tumbled more than five percent.
    Copper <MCU3> for three month delivery in the London Metal Exchange closed 
at $6,655, down $25 from Tuesday, bouncing back from a session low of $6,602..
    Mining shares like BHP Billiton <BLT.L>, Anglo American <AAL.L>, Xtrata 
<XTA.L> all closed down between half a percent and 1.5 percent alongside with 
main European FTSEurofirst 300 Index <.FTEU3>.
    "Base metal prices came off after Bernanke's speech but held into positive 
territory," said analyst Peter Fertig at Dresdner Kleinwort.
    "It has been the mortgage equity driving the private consumption in the 
U.S., which is no longer the case. This implies less possibilities to spend and 
therefore negative for the U.S. economy."
    In remarks to Congress, Bernanke said near-term prospects for the U.S. 
housing market are uncertain and that developments in the subprime mortgage 
sector have raised more questions. [nN28296872]
    The dollar extended losses against the yen on Wednesday, in line with the 
U.S. stock market's broad weakness, after Federal Reserve Chairman Ben Bernanke 
said U.S. economic uncertainty has increased.
    Fertig said rising demand for copper and supply tightness still squeezing 
the market were supporting the prices.
    Chinese refined copper imports hit their highest level in two years in 
February and banks and brokerage houses like Barclays, Deutsche Bank and Numis 
Securities has revised up their copper prices forecasts on strong demand seen 
continuing.

    TIN DOWN SHARPLY
    Tin prices <MSN3>, started the day in the negative territory on profit 
taking, extended losses after Bernanke's speech, plummeting more than 5 percent.
    Three-month tin <MSN3> on the London Metal Exchange hit $13,800 at the 
close against $14,595 on Tuesday.
    Tin has gained around 20 percent this year on concerns about supplies from 
Indonesia, the world's second biggest producer.
    "There was reasonably good turnover on that today, people have been long 
for a while and probably want to take profit," an LME trader said.
    Nickel <MNI3> gained 1.8 percent to $43,400 against Tuesday's $42,600 and 
lead <MPB3> was up 2.7 percent at $1,900.
    "There are some market players that want to see the price higher ahead of 
the end of the month," an LME trader said.
    Nickel prices have dropped some 12 percent since its high of $48,500 in 
mid-March, but concerns of further delays at the CVRD's <VALE5.SA <RIO.N>> Goro 
project could limit the downside to prices. [ID:nSYD98819]
    Many fund managers are evaluated at the last day of the month on how well 
their investments performed and for some investors March is the end of their 
financial year.
    Dealers expected trading conditions to remain thin and volatile ahead of 
April when fresh fund money is allocated.
    Lead was also underpinned by tight supplies and Xstrata's <XTA.L> force 
majeure at its Northfleet refinery in the United Kingdom, analysts said.
    Aluminium <MAL3> ended at $2,750 and zinc <MZN3> gained $20 to $3,200.

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