Toronto stocks fell Monday pulled lower by troubles at Cameco and falling oil prices.

The S&P/TSX composite index closed down 114.54 points, or 0.8%, at 14,468.33.

Uranium producer Cameco was the index’s biggest weighted loser as it said it would suspend production at a nuclear fuel conversion plant in Port Hope, Ontario.

Cameco shares sank $3.19, or 6.5%, to $46.13.

All of the index’s 10 main sectors were lower, except telecoms and the small health group, which added 0.6% largely due to a rebound by Biovail, which added 70¢, or 3.3%, to $21.65.

Biovail plunged late last week when it said the U.S. Food and Drug Administration rejected its new drug application for the anti-depressant bupropion. It recovered some of those losses when it said the rejection would have no impact on its 2007 financial forecast.

After three days of gains, the TSX materials sector fell 0.7%. Potash Corp. of Saskatchewan was down 99¢, or 1.1%, to $86.41.

OPEC pledged to pump more crude if needed to tame near-record prices, pushing down the September crude contract on the New York Mercantile Exchange down 90¢ to US$74.89.

On the TSX, oil and gas issues slipped 1.7%, led by Suncor Energy, down $1.74, or 1.7%, at $98.35.

The junior S&P/TSX Venture composite index moved 3.1 points lower to 3,322.76.

The Canadian dollar rose 0.14 of a cent to US95.51¢.

In New York, blue chip stocks rose on Monday on takeover news and strong earnings.

Merck, a Dow component, reported quarterly results that beat analysts’ expectations while Halliburton, the world’s second-largest oil services company, also topped forecasts and its shares rose to their highest since June 2006.

Also on Monday, Transocean, the world’s largest offshore driller, said it had agreed to buy drilling rig operator GlobalSantaFe Corp. for US$18 billion.

The Dow Jones industrial average closed up 92.34 points, or 0.67%, at 13,943.42.

The S&P 500 was up 7.47 points, or 0.49%, at 1,541.57. The tech-heavy Nasdaq composite index gained 2.98 points, or 0.11%, at 2,690.58.