Some of the most active companies traded Thursday on the Toronto Stock Exchange:Toronto Stock Exchange (15,033.64, down 48.57 points):Hydro One Ltd. Instalment Receipts (TSX:H.IR). Utilities. Up five cents, or 0.14 per cent, to $37.00 on 10.5 million shares.Primero Mining Corp. (TSX:P). Miner. Up 2.5 cents, or 22.73 per cent, to 13.5 cents on 6.7 million shares.Trevali Mining Corp. (TSX:TV). Miner. Down eight cents, or 5.44 per cent, to $1.39 on 6.3 million shares.Lundin Mining Corp. (TSX:LUN). Miner. Up five cents, or 0.56 per cent, to $9.05 on 4.7 million shares.B2Gold Corp. (TSX:BTO). Miner. Up two cents, or 0.64 per cent, to $3.15 on 3.5 million shares.Teck Resources Ltd. (TSX:TECK.B). Miner. Down 51 cents, or 1.71 per cent, to $29.25 on 3.4 million shares.