BUZZ-Vale SA: U.S.-listed shares slide as spot iron hits 5-year low
** Brazilian miner's U.S.-listed shares down 1.7 pct at $9.40 in early trading
** Spot iron ore prices fall to lowest since 2009 and likely to drop further due to well-supplied market that has reduced the need for Chinese steel mills to restock
** Prices of iron ore, a major source of revenue for Vale, have tumbled more than 43 percent this year
** Up to Wednesday's close, the company's shares had fallen more than 37 percent this year (email@example.com)
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