Prime Minister Stephen Harper's trip to China comes amid a renewed focus on Canada's natural resource exports, including oil and gas, forest products, minerals and agricultural products.

Mining giant Teck Resources Ltd. had record-high revenue in the first quarter and a net profit of $218 million but fell short of analyst estimates as lower copper prices put a slight dent into its sales revenue.

Mining company Xstrata and commodities dealer Glencore agree to a $90 billion US merger that will create the world's fourth-largest natural resources company, including control of former Falconbridge operations in Sudbury, Ont.