Oct 31 (Reuters) - Canada's main stock index opened lower on Thursday, as energy stocks were weighed by lower crude prices and disappointing earnings from Suncor Energy and Pretium Resources.
* Seven of the index's 11 major sectors were trading lower, led by a near 2% slide in energy stocks .SPTTEN .
* At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's S&P/TSX Composite index .GSPTSE was down 41.37 points, or 0.25%, at 16,460.06.