Standard & Poor's Canadian index operations have made index changes as a result of the quarterly S&P/TSX Preferred Share Index and S&P/TSX Venture Select Index reviews.

The changes will be effective at the open on Monday, April 23, 2012.

          S&P/TSX VENTURE SELECT INDEX ADDITION

Symbol   Issue name                                Cusip   

RGX      Argex Mining Inc.                         04013Q 10 9

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.