Rio Alto Mining announces that it has granted stock options to employees, a consultant, officers and directors to acquire a total of 2,100,000 common shares pursuant to the terms of the Company's stock option plan. Stock options to acquire 1,050,000 common shares were issued to directors. These options are exercisable at $1.80 per common share, which is $0.45 greater than the September 20, 2010 closing price of the
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