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

Toronto Stock Exchange (11,947.29 down 172.64 points):

Alterra Power Corp. (TSX:AXY). Renewable power producer. Up 1.5 cents, or five per cent, at 31.5 cents on 15.4 million shares.

Osisko Mining Corp. (TSX:OSK). Miner. Down 47 cents, or 11.87 per cent, at $3.49 on 10.8 million shares. The stock continued its decline since last week as gold stocks lost their lustre on weak bullion prices. The June gold contract finished US$4.70 lower at $1,382.70 an ounce on the New York Mercantile Exchange.

Barrick Gold Corp. (TSX:ABX). Miner. Down $1.07, or 5.56 per cent, at $18.17 on 10.41 million shares. Moody’s Investors Service said it is reviewing a possible downgrade of the giant gold miner’s rating after a Chilean court last week halted construction at its $8 billion Pascua-Lama project due to environmental concerns.

INV Metals Inc. (TSX:INV). Miner. Unchanged at 2.5 cents on 8.44 million shares.

First Quantum Minerals Ltd. (TSX:FM). Miner. Down $1.60, or 9.40 per cent, at $15.43 on 6.28 million shares.

Bombardier Inc. (TSX:BBD.B). Transportation equipment. Down seven cents, or 1.77 per cent, at $3.88 on 5.83 million shares.

Toronto Venture Exchange (921.70 down 38.30 points):

Sandstorm Metals and Energy Ltd. (TSXV:SND). Down two cents, or 6.25 per cent, at 30 cents on 5.04 million shares.

Ultra Lithim Inc. (TSXV:ULI). Up 1.5 cents, or 17.65 per cent, at 10 cents on 3.64 million shares.

Companies reporting major news:

Rogers Communications (TSX:RCI.B). Media and communications. Down 56 cents, or 1.08 per cent, at $51.39 on 885,342 shares. The company bought Blackiron Data from Primus Telecommunications Group for $200 million in cash. The data centre and cloud computing company’s 132 employees will join Rogers.

SNC-Lavalin Group Inc. (TSX:SNC). Engineering and construction. Down 87 cents, or 2.05 per cent, at $1.63 on 1.58 million shares. The company, which is grappling with a number of controversies, reached a settlement with the World Bank Group in an investigation into allegations of bribery involving a bridge contract in Bangladesh. No financial penalty was imposed.