News Release

TSX Review of Constellation Copper Corporation (CCU)

June 30, 2008

JUNE 30, 2008 (TORONTO) -- TSX has extended its review of the eligibility of the common shares of Constellation Copper Corporation (Symbol: CCU) and the debentures (Symbol: CCU.DB) for continued listing until July 30, 2008.

About TMX Group Inc. (TSX-X)

TMX Group is the leading integrated exchange group in Canada, operating markets for multiple asset classes. TMX Group operates Canada's two national stock exchanges: Toronto Stock Exchange, Canada's senior equities market, providing an efficient, liquid market for a broad cross-section of more than 1600 Canadian issuers and TSX Venture Exchange, providing access to capital for companies at the early stages of their growth while offering investors a well-regulated market for making venture investments. TMX Group also operates Montreal Exchange, Canada's only derivatives marketplace, Natural Gas Exchange (NGX), a leading North American exchange for the trading and clearing of natural gas and electricity contracts and Shorcan Brokers Limited, the country's first fixed income inter-dealer broker. TMX Group also owns The Equicom Group Inc., a leading provider of investor relations and related corporate communication services in Canada. From its preeminent domestic base, TMX Group's reach continues to extend internationally, through TSX Markets and Datalinx which provide the trading and data to the global financial community who access Canada's equity capital market. TMX Group is the 7th largest exchange group in the world and in 2007, a record 150 billion of securities volume traded. TMX Group is headquartered in Toronto and maintains offices in Montreal, Calgary and Vancouver.

Corporate Communications, TSX Group Inc., Toll Free 1-888-873-8392, info@tsx.com.