TORONTO (Reuters) - The Toronto Stock Exchange's main index bounced back yesterday, regaining more than 100 points after last week's big fall, as firming metal prices boosted materials issues.

The S&P/TSX composite index closed up 116.19 points, or 0.8 percent, at 13,864.72 after dropping 5.7 percent last week.

The materials sector, which accounts for about 16 percent of the overall index, recovered nearly half its losses from last week. It soared 3.1 percent as most base metals, including copper, tin and zinc, firmed on commodities exchanges.

Gold meanwhile rebounded as the US dollar weakened, boosting bullion producers such Barrick Gold, up C$1.67, or 4.9 percent, at C$35.56. Potash Corp. of Saskatchewan, which reported a higher quarterly profit last week, jumped C$4.21, or 5.1 percent, to C$86.71.

Uranium producer Cameco Corp. meanwhile sank 15 Canadian cents, or 0.4 percent, to C$42.85 after it said yesterday its second quarter jumped 37 percent, but fell short of expectations.

Eight of the index's ten main groups marched ahead. Information technology issues were up 1.1 percent, while telecoms gained 1.2 percent. Research In Motion Ltd. added C$6.43, or 2.8 percent, to C$235.28.

The financial group, which represents about one-third of the overall index, logged its fifth loss in six sessions, falling 0.2 percent.

Banks were the five biggest weighted losers Monday, led by Royal Bank of Canada, down 61 Canadian cents, or 0.9 percent, at C$68.85.