REFILE-BUZZ-First Majestic Silver Corp: To sell 4.6 mln shares
(Adds $ symbol in second bullet)
** Silver producer's U.S.-listed shares down 6.7 pct at $5.30
** Enters into private placement agreement with BMO Capital Markets for 4.6 mln common shares at C$6.50 per share
** Placement represents 3.9 percent of total outstanding shares as of Dec. 30, according to Thomson Reuters data
** Says intends to use proceeds to ramp up development at a Mexican mine and for general working capital needs
** Up to Monday's close, stock had risen 13 pct this year
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