- The Toronto Stock Exchange's S&P/TSX composite index was down 51.91 points, or 0.3pc, at 16,988.29.
- The most heavily traded shares by volume were Continental Gold Inc, Husky Energy and Harte Gold Corp .
- Eight stocks on the TSX posted new 52-week highs and one fell to a new low.
Canada's main stock index fell on Monday, tracking global stocks, as US President Donald Trump decided to restore tariffs on steel and aluminum imports from Brazil and Argentina, shrugging off a jump in oil prices following strong data from China.
At 10:37 a.m. ET (15:37 GMT), the Toronto Stock Exchange's S&P/TSX composite index was down 51.91 points, or 0.3pc, at 16,988.29.
Canadian manufacturing activity expanded in November for the third consecutive month as production climbed at a faster pace and new orders continued to grow, but the momentum was subdued compared to historical levels.
The energy sector dropped 0.2pc even as US crude prices were up 1.7pc a barrel, while Brent crude added 1.3pc.
The financials sector slipped 0.2pc, while the industrials sector fell 0.1pc.
The materials sector, which includes precious and base metals miners and fertilizer companies, added 0.3pc despite gold futures falling 0.3pc to $1,461.2 an ounce.
On the TSX, 81 issues were higher, while 147 issues declined for a 1.81-to-1 ratio to the downside, with 53 million shares traded.
The largest percentage gainers on the TSX were Bombardier B and Meg Energy Corp, which jumped 2.5pc and 2.2pc, respectively.
Centerra Gold fell 20.8pc, the most on the TSX, after open pit mining operations were temporarily halted at its Kumtor gold mine in Kyrgyzstan. The second biggest decliner was Shopify Inc, down 6.7pc.
The most heavily traded shares by volume were Continental Gold Inc, Husky Energy and Harte Gold Corp .
Eight stocks on the TSX posted new 52-week highs and one fell to a new low.
Across all Canadian issues there were 42 new 52-week highs and seven new lows, with total volume of 103.45 million shares.