* TSX down 254.89 points, or 1.61 percent, at 15,606.03
* All of the TSX's 10 main groups were trading lower (Updates share prices)
TORONTO, Feb 2 (Reuters) - Canada's main stock index slumped to a four-month low on Friday, with natural resource shares leading broad based declines as commodity prices dropped and higher bond yields pressured global equity markets.
U.S. crude CLc1 prices were down 1.1 percent at $65.09 a barrel, while Brent crude LCOc1 lost 2 percent to $68.27. energy group retreated 2.5 percent. Suncor Energy slipped 1.8 percent to C$43.81, and Canadian Natural Resources Ltd CNQ.TO dropped 1.4 percent to C$41.88.
The financials group slipped 1.2 percent. Bank of Nova Scotia BNS.TO gave back 0.9 percent to C$80.01, and Canadian Imperial Bank of Commerce CM.TO lost 1.7 percent to C$119.
The materials group, which includes precious and base metals miners and fertilizer companies, lost 2.8 percent. Barrick Gold Corp ABX.TO slipped 3.7 percent to C$17.04, and Goldcorp Inc G.TO fell 2.9 percent to C$17.02.
Gold futures GCc1 fell 1.3 percent to $1,331.34 an ounce. GOL/ Copper prices CMCU3 declined 0.6 percent to $7,079 a tonne. Toronto Stock Exchange's S&P/TSX composite index .GSPTSE closed down 254.89 points, or 1.61 percent, at 15,606.03, its biggest drop since May. All of the index's 10 main groups were in negative territory.