CANADA STOCKS-Miners lift TSX to highest-ever close

* TSX up 51.76 points, or 0.34 percent, at 15,146.01 * Eight of 10 main index sectors advance * Index records monthly, quarterly gains * Mining shares follow gold, copper prices higher By John Tilak TORONTO, June 30 (Reuters) - Canada's main stock index hit its highest-ever close on Monday as strength in the prices of commodities such as bullion and copper helped drive up shares in the materials sector. Investors appeared to shrug off government figures that showed Canad