Some of the most active companies traded Tuesday on the Toronto Stock Exchange:Toronto Stock Exchange (15,256.35, down 1.62 points):IC Potash Corp. (TSX:ICP). Agriculture. Unchanged at three cents on 14.7 million shares.Encana Corp. (TSX:ECA). Oil and gas. Up 22 cents, or 1.79 per cent, to $12.52 on 5.2 million shares.BetaPro Crude Oil. (TSX:HOU). Oil and gas. Down 10 cents, or 1.62 per cent, to $6.08 on 4.3 million shares.Trevali Mining Corp. (TSX:TV). Miner. Up four cents, or 3.17 per cent, to $1.30 on 4.2 million shares.Manulife Financial Corp. (TSX:MFC). Financial Services. Up five cents, or 0.19 per cent, to $25.93 on 3.6 million shares.First Quantum Minerals Ltd. (TSX:FM). Miner. Up 64 cents, or 4.77 per cent, to $14.06 on 3.5 million shares.Companies reporting major news:Great Canadian Gaming Corp. (TSX:GC). Travel and leisure. Up $4.57, or 17.97 per cent, to $4.57 on 625,126 shares. Brookfield Business Partners LP (TSX:BBU.UN). Real estate. Up $2.74, or 7.76 per cent, to $38.05 on 329,341 shares. The Ontario Lottery and Gaming Corp. has selected these two companies to run its casinos in the Greater Toronto Area. Under the deal, Great Canadian and Brookfield would acquire OLG Slots at Woodbine, OLG Slots at Ajax Downs and the Great Blue Heron Casino located in the Mississaugas of Scugog Island First Nation.