* The Toronto Stock Exchange's S&P/TSX .GSPTSE fell 79.04 points, or 0.48 percent, to 16,462.95.
* Leading the index were Birchcliff Energy Ltd BIR.TO , up 3.0 percent, Shopify Inc SHOP.TO , up 2.7 percent, and Ero Copper Corp ERO.TO , higher by 1.9 percent.
* Lagging shares were CannTrust Holdings Inc TRST.TO , down 22.6 percent, SNC-Lavalin Group Inc SNC.TO , down 6.3 percent, and Precision Drilling Corp PD.TO , lower by 4.5 percent.
* On the TSX 72 issues rose and 161 fell as a 0.4-to-1 ratio favored decliners. There were 4 new highs and 3 new lows, with total volume of 170.2 million shares.
* The most heavily traded shares by volume were Canntrust Holdings Inc TRST.TO , Toronto-dominion Bank TD.TO and Encana Corp ECA.TO .
* The TSX's energy group .SPTTEN fell 1.08 points, or 0.8 percent, while the financials sector .SPTTFS slipped 1.24 points, or 0.4 percent.
* West Texas Intermediate crude futures CLc1 fell 0.05 percent, or $0.03, to $57.48 a barrel. Brent crude LCOc1 fell 0.5 percent, or $0.32, to $63.91 O/R
* The TSX is up 14.9 percent for the year.