Canada's main stock market started the week down for seventh-straight day amid an off-day for any headlines on NAFTA as negotiations are set to resume Tuesday.

Canada and the United States will restart high-level talks Tuesday on the North American Free Trade Agreement as Foreign Affairs Minister Chrystia Freeland returns to Washington in hope of making progress on stubborn differences.

Freeland and her counterpart, U.S. Trade Representative Robert Lighthizer, left the bargaining table last Friday without a deal following two weeks of what Freeland described as intense, but productive, negotiations.

The Toronto Stock Exchange's benchmark Standard & Poor's/TSX Composite Index was down 33.18 points, or 0.21 percent, to finish the day at 16,057.09 points.

The Canadian dollar edged up 0.07 cents to 0. 75.97 U.S. dollar.

The largest percentage gainer on the market was Parex Resources, rising 86 cents, or 4.6 percent, to 19.77 Canadian dollars while cannabis company Aphria jumped 1.33 dollars, or 6.5 percent to 21.71 Canadian dollars and Canopy Growth rose 1.9 percent to 69.02 Canadian dollars.

Magna International climbed 75 cents, or 1.17 percent, to 69.44 Canadian dollar while Gildan Activewear added 67 cents, or 1.8 percent, to 38.76 Canadian dollars.

Gold stocks weighed on the market as Barrick Gold gave back 42 cents, or 3.2 percent, to 12.86 Canadian dollars while Goldcorp ducked back 25 cents, or 1.9 percent, to 13.29 Canadian dollars.

Also among losing stocks in the materials sector, Lundin Mining lost a cent to 6.43 Canadian dollars, while Agnico Eagle Mines faded 19 cents to 43.54 Canadian dollars.