Canada's main stock index ticked lower Tuesday amid mixed trading results, while U.S. markets moved higher. 

The S&P/TSX Composite Index closed down 30.59 points, or 0.15 per cent, at 20,551.53.

In New York, the Dow Jones Industrial Average was up 26.83 points at 35,438.07. The S&P 500 Index was up 12.82 points at 4,567.46, while the Nasdaq Composite was up 85.69 points at 14,144.56.

The Canadian dollar traded for 75.85 cents U.S. compared with 75.92 cents U.S. on Monday.

The September crude oil contract was up 89 cents at US$79.63 per barrel and the September natural gas contract was up six cents at US$2.75 per mm/BTU.

The August gold contract was up US$1.50 at US$1,963.70 an ounce and the September copper contract was up six cents at US$3.92 a pound.