* The Toronto Stock Exchange's S&P/TSX .GSPTSE fell 122.17 points, or 0.75 percent, to 16,149.49.
* Leading the index were Yamana Gold Inc YRI.TO , up 9.1 percent, Aurora Cannabis Inc ACB.TO , up 7.9 percent, and Kirkland Lake Gold Ltd KL.TO , higher by 6.6 percent.
* Lagging shares were Ensign Energy Services Inc ESI.TO , down 9.1 percent, Seven Generations Energy Ltd VII.TO , down 8.7 percent, and SNC-Lavalin Group Inc SNC.TO , lower by 8.1 percent.
* On the TSX 62 issues rose and 174 fell as a 0.4-to-1 ratio favored decliners. There were 23 new highs and 23 new lows, with total volume of 316.9 million shares.
* The most heavily traded shares by volume were Aurora Cannabis Inc ACB.TO , Bombardier Inc BBDb.TO and Encana Corp ECA.TO .
* The TSX's energy group .SPTTEN fell 3.34 points, or 2.6 percent, while the financials sector .SPTTFS slipped 3.63 points, or 1.2 percent.
* West Texas Intermediate crude futures CLc1 fell 1.65 percent, or $0.9, to $53.79 a barrel. Brent crude LCOc1 fell 1.19 percent, or $0.71, to $59.1 O/R
* The TSX is up 12.8 percent for the year.