TORONTO, Oct 17 (Reuters) - Canada's main stock index opened marginally positive on Tuesday as Bombardier Inc BBDb.TO stock surged more than 20 percent after the planemaker announced a CSeries partnership with Airbus, but gains were offset by mining shares, which fell on lower metal prices.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE rose 9.85 points, or 0.06 percent, to 15,812.55.
Seven of the index's 10 main stocks were in positive territory.