Most actively traded companies on the TSX, TSX Venture Exchange markets

TORONTO - Some of the most active companies traded Tuesday on the Toronto Stock Exchange and the TSX Venture Exchange:

Toronto Stock Exchange (12,847.44 up 60.25 points):

Mirabela Nickel Ltd. (TSX:MNB). Miner. Down a penny, or 66.67 per cent, at half a cent on 12.86 million shares. Votorantim Metais Niquel S.A., one of the company's two customers, has provided a date for the closure of its smelting facilities after having given a warning last week. Votorantim said it will close its facilities at the end of November due to "adverse nickel market conditions."

Talisman Energy Inc. (TSX:TLM). Oil and gas. Up 58 cents, or 4.91 per cent, at $12.40 on 9.96 million shares. The energy sector was one of the gainers on the main index, up 0.87 per cent.

Petrominerales Ltd. (TSX:PMG). Oil and gas. Down three cents, or 0.26 per cent, at $11.67 on 8.95 million shares.

Air Canada (TSX:AC.B). Airline. Up 22 cents, or 6.23 per cent, at $3.75 on 4.89 million shares.

Golcorp Inc. (TSX:G). Miner. Down 74 cents, or 2.76 per cent, at $26.06 on 4.20 million shares.

Toronto Venture Exchange (942.04 up 0.88 of a point):

Alston Energy Inc. (TSXV:ALO). Oil and natural gas explorer. Unchanged at half a cent on 6.58 million shares.

Petroamerica Oil Corp. (TSXV:PTA). Oil and gas. Down two cents, or 6.15 per cent, at 30.5 cents on 5.70 million shares.

Companies reporting major news:

Enbridge Inc. (TSX:ENB). Pipeline. Down 58 cents, or 1.35 per cent, at $42.44 on 1.89 million shares. An executive of the Calgary-based company said it is planning to build a $1-billion pipeline to bring diluent — used to thin oilsands bitumen so it can flow through pipelines — to industry players in northern Alberta.

Encana Corp. (TSX:ECA). Natural gas. Up 14 cents, or 0.79 per cent, at $17.94 on 2.85 million shares. The natural gas giant is paring down its management ranks with five executives leaving the company. CEO Doug Suttles calls the move "a simpler organizational structure with clear accountabilities across the company."

Tembec Inc. (TSX:TMB). Forestry. Up 12 cents, or 4.90 per cent, at $2.57 on 40,434 shares. Tembec has agreed to sell nearly 2,000 hectares of land in British Columbia to Jemi Holdings Ltd., for $4.2 million.