(Reuters) - Canada's main stock index opened higher for the second straight session on Tuesday, helped by gains in shares of material and energy companies due to a rise in oil and gold prices.
* At 9:40 a.m. ET (13:40 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was up 28.21 points, or 0.17 percent, at 16,305.94.
* Optimism around NAFTA deal talks returned following the victory of Mexican leftist Andres Manuel Lopez Obrador, as a top adviser to the presidential winner said Obrador will jumpstart talks to renegotiate the 24-year-old pact. Oil prices jumped after Libya declared force majeure on some of its crude exports, while the loss of Canadian supplies helped lift U.S. crude to 3-1/2-year highs.
* The energy sector .SPTTEN climbed 0.9 percent as U.S. crude CLc1 prices rose 1.6 percent a barrel, while Brent crude LCOc1 added 1.3 percent. O/R
* Suncor Energy SU.TO and Canadian Natural Resources CNQ.TO provided the biggest boost to the energy index.
* Gold prices recovered from a nearly seven-month low as dollar eased and Asian shares sank amid heightening trade friction between the United States and major economies. GOL/
* The materials sector .GSPTTMT , which includes precious and base metals miners and fertilizer companies, added 0.5 percent as gold futures GCc1 rose 0.8 percent to $1,249.5 an ounce. GOL/
* 10 of the index's 11 major sectors were higher, led by the energy sector.
* Financials .SPTTFS was only sector in the red with a 0.1 percent decline.
* On the TSX, 165 issues were higher, while 70 issues declined for a 2.36-to-1 ratio favouring gainers, with 16.66 million shares traded.
* The largest percentage gainers on the TSX were Tahoe Resources THO.TO , which jumped 3.3 percent and Cenovus Energy CVE.TO , which rose 3.2 percent.
* Hudbay Minerals HBM.TO fell 2.7 percent, the most on the TSX, followed by a 2.6 percent decline in shares of Teck Resources TECKb.TO .
* The most heavily traded shares by volume were Aurora Cannabis ACB.TO and Bombardier B BBDb.TO .
* The TSX posted six new 52-week highs and one new low.
* Across all Canadian issues there were 15 new 52-week highs and 14 new lows, with total volume of 28.33 million shares.