India, Aug. 4 -- Canadian stocks may open higher on Tuesday with firm precious metals prices set to trigger some strong buying in the materials space. Uncertainty surrounding U.S.-Iran peace talks could weigh on the market a bit.

Data from Statistics Canada showed the nation's trade surplus widened to $C$3.86 billion in June, from the C$3.7 billion in May to mark the largest surplus in over four years. Exports rose by 0.4% from the previous month to a record high of C$77.5 billion, while imports rose by 0.2% to a record of C$73.6 billion.

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