BUZZ-Rio Alto Mining Ltd: To be bought by Tahoe Resources Inc
** Canadian gold miner Rio Alto's U.S.-listed shares up 12.5 pct at $2.97; Toronto shares up 12 pct at C$3.68
** Tahoe offers to buy Rio Alto for C$4 per share, or C$1.4 bln ($1.12 bln) in a cash and share deal
** Acquirer Tahoe's U.S.-listed shares down 7 pct $13.10; Toronto shares down 7.6 pct at C$16.34
** Acquisition to help expand Tahoe's presence in Latin America
** Toronto-listed stock of Rio Alto's had risen 30 pct in six months through Friday, while Tahoe's had fallen 39 pct
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