Some of the most active companies traded Monday on the Toronto Stock Exchange:Toronto Stock Exchange (15,236.67, up 63.64 points):Titan Medical Inc. (TSX:TMD). Healthcare. Up three cents, or 15.79 per cent, to 22 cents on 5.29 million shares.Encana Corp. (TSX:ECA). Oil and gas. Up 43 cents, or 3.38 per cent, to $13.14 on 5.26 million shares.Potash Corp. of Saskatchewan (TSX:POT). Fertilizer. Up 79 cents, or 3.46 per cent, to $23.59 on 5.21 million shares.Kinross Gold Corp. (TSX:K). Miner. Down 31 cents, or 5.27 per cent, to $5.57 on 3.6 million shares. The company announced plans to expand its Tasiast mine in Mauritania and Round Mountain mine in Nevada at a combined cost of more than US$1 billion. Kinross says it will spend about US$590 million on Phase Two at its Tasiast mine as it works to increase mill capacity to 30,000 tonnes per day, up from 12,000 tpd, and cut costs.Precision Drilling Corp. (TSX:PD). Oil and gas. Up three cents, or 0.86 per cent, to $3.53 on 3.55 million shares.Semafo Inc. (TSX:SMF). Miner. Up 22 cents, or 6.88 per cent, to $3.42 on 3.51 million shares.