* TSX down 50.12 points, or 0.33 percent, at 15,263.01
* Seven of the TSX's 10 main groups trade lower
TORONTO, March 22 (Reuters) - Canada's main stock index fell on Wednesday as weakness in oil prices weighed on the energy sector, offsetting modest strength in gold-mining shares.
The energy group retreated 0.8 percent. Suncor Energy Inc SU.TO gave back 0.4 percent to C$40.38, and TransCanada Corp TRP.TO was down 0.3 percent at C$60.92.
U.S. crude CLc1 prices were down 1.2 percent to $47.67 a barrel, while Brent crude LCOc1 lost 1.3 percent to $50.3. financials group slipped 0.9 percent. Royal Bank of Canada RY.TO fell 0.6 percent to C$94.86, and Toronto Dominion Bank TD.TO slipped 0.5 percent to C$64.50.
The materials group, which includes precious and base metals miners and fertilizer companies, added 0.9 percent. Barrick Gold Corp ABX.TO advanced 0.4 percent to C$26.10. Miner Teck Resources Ltd TCKb.TO gained 2.1 percent to C$27.86.
Gold futures GCc1 rose 0.1 percent to $1,247.9 an ounce. Copper prices CMCU3 declined 0.5 percent to $5,747 a tonne. 10.10 ET, the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE fell 50.12 points, or 0.33 percent, to 15,263.01. Of the index's 10 main groups seven were in negative territory.