BUZZ-Vale SA: Plans to sell minority stake in base metals unit
** Brazilian miner's shares up 0.48 pct at 18.82 reais; U.S.-listed shares up 2.4 pct at $8.52 premarket
** Company says considering sale of a 30-40 pct stake in base metals unit in IPO to raise funds for key projects amid sliding commodity prices
** Analysts value total base metal unit at $28-$35 bln
** World's largest miners are shedding non-core assets to cope with low base metal prices
** Vale's profit margins have suffered with price of iron ore .IO62-CNI=SI down by half this year
** Up to Tuesday's close, Vale's U.S. stock had fallen 45.4 pct, while Brazil shares down 38.4 pct this year
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