At 10:04 a.m. EDT (1404 GMT), the Toronto Stock Exchange's S&P/TSX composite index <.GSPTSE> was down 55.06 points, or 0.38 percent, at 14,564.40.

Crude oil futures fell as optimism faded for an output-limiting deal from an oil producer meeting in Algeria to curb one of the worst supply gluts in history. [O/R]

The energy group retreated 1.3 percent, with Canadian Natural Resources Ltd (>> Canadian Natural Resources Limited) down 1.6 percent to C$38.47 and Suncor Energy Inc (>> Suncor Energy Inc.) off 1.2 percent to C$34.26. Both are among the most influential movers on the index.

The materials group, which includes precious and base metals miners and fertilizer companies, lost 1.2 percent.

The TSX-listed shares of Australia-based OceanaGold Corp (>> OceanaGold Corporation) fell 10.4 percent to C$4.22 as it faced a suspension of operations in the Philippines.

Most of the mines targeted by the government were nickel producers, and the news sent global prices up more than 1 percent.

Gold prices, meanwhile, fell as the U.S. dollar and Wall Street stocks gained ground on the view that U.S. presidential candidate Hillary Clinton got the better of rival Donald Trump in their first debate. [GOL/][.N]

Barrick Gold Corp (>> Barrick Gold Corp.) fell 1.8 percent to C$23.30. Smaller producer B2Gold Corp (>> B2Gold Corp.) fell 9.7 percent to C$3.46.

Six of the index's 10 main groups were in negative territory, with two decliners for every gainer.

On the positive side, Fairfax Financial Holdings Ltd (>> Fairfax Financial Holdings Ltd) rose 1.4 percent to C$752.44 and Valeant Pharmaceuticals International Inc (>> Valeant Pharmaceuticals Intl Inc) advanced 1.8 percent to C$34.85. It had slipped ahead of Monday night's presidential debate.

U.S. crude oil prices were down 2.3 percent to $44.86 a barrel, while Brent lost 2.2 percent to $46.32.[O/R]

Gold futures fell 0.8 percent to $1,328.7 an ounce and copper prices lost 0.9 percent to $4,798 a tonne. [GOL/][MET/L]

(Reporting by Alastair Sharp; Editing by Dan Grebler)