TORONTO, Aug 22 (Reuters) - Canada's main stock index fell on Monday as lower oil and metal prices weighed on energy and mining stocks, offsetting gains for a major consumer staples company after it said it would buy a U.S. convenience store chain.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 68.35 points, or 0.47 percent, at 14,619.11, shortly after the open. Eight of the index's 10 main groups were lower.