* The Toronto Stock Exchange's TSX falls 0.30 percent to 17,481.29
* Leading the index were Great Canadian Gaming Corp
* Lagging shares were Vermilion Energy Inc, down 7.5%, Enerplus Corp, down 7.2%, and MEG Energy Corp, lower by 6.7%.
* On the TSX 77 issues rose and 143 fell as a 0.5-to-1 ratio favored decliners. There were 5 new highs and no new lows, with total volume of 162.5 million shares.
* The most heavily traded shares by volume were Air Canada, Suncor Energy Inc and Crescent Point Energy Corp.
* The TSX's energy group fell 2.58 points, or 2.8%, while the financials sector slipped 0.98 points, or 0.3%.
* West Texas Intermediate crude futures fell 2.67%, or $1.31, to $47.79 a barrel. Brent crude fell 2.89%, or $1.51, to $50.75 [O/R]
* The TSX is up 2.4% for the year.