BUZZ-McEwen Mining Inc: Robbers loot gold worth $8.5 mln
** Canada-based miner's U.S.-listed shares down 4.7 pct at $1.01 premarket
** Company says armed robbers stole about 7,000 ounces of gold contained in some 900 kilograms of gold-bearing concentrate from its El Gallo 1 mine in Mexico
** At current gold price stolen gold would be worth nearly $8.5 mln
** Company says insurance policy not sufficient to cover entire amount of expected loss
** Up to Tuesday's close, stock had fallen about 57 pct in 12 months
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