Standard & Poor's Announces Changes In The S&P/TSX Canadian Indices

Standard & Poor's will make the following changes in the S&P/TSX Canadian Indices:

The Toronto Stock Exchange announced today in the Daily Bulletin that the shares of Rio Alto Mining Limited (TSXVN: RIO) will graduate to trade on TSX at the open of trading on Friday, February 24, 2012. The ticker symbol will remain "RIO" and the CUSIP number will remain 76689T 10 4. The company will be removed from the S&P/TSX Venture Composite Index after the close of trading on Thursday, February 23, 2011.

Rio Alto Mining is also a constituent of the S&P/TSX Venture Select Index. The company will be removed from this index effective after the close of Thursday, March 1, 2012, at which time it will be listed on TSX.

The company is also a constituent of the S&P/TSX Venture 30 Index. According to methodology, it will remain in this index while trading on TSX until the next semi-annual review of the index in August, 2012.

Company additions to and deletions from an S&P equity index do not in any way reflect an opinion on the investment merits of the company.