TORONTO (Reuters) - The Toronto Stock Exchange's main index closed lower yesterday as financial shares fell on worries over more losses related to the credit crunch, offsetting a rebound by gold producers.

Bay Street's financials were caught up in more woes out of the US after JPMorgan Chase said it has accumulated $1.5 billion of losses so far this quarter on mortgage-related assets.

The news stoked concerns of more pain yet to come out of the US mortgage crisis, and in Toronto National Bank of Canada slid 2.8 percent.

Leading the upside, the materials sector got a boost from gold-mining stocks even as gold prices fell as the sector rebounded from a recent sell-off. Agnico-Eagle Mines bounced six percent.

The S&P/TSX composite index closed down 36.19 points, or 0.27 percent, at 13,167 with six of its 10 main sectors in negative territory. It was the fourth session in a row the benchmark index has closed lower.

Shares of silicon processor Timminco slumped C$4.87, or 24.4 percent, to C$15.10 after the company reported quarterly results Monday that were not as strong as anticipated.

The financial sector lost 1.1 percent, with National down C$1.46 at C$50.44, and Royal Bank of Canada falling 79 Canadian cents, or 1.7 percent, to C$47.13.

The gold producers sub-index gained 2.6 percent, giving a 2.1 percent lift to the larger materials sector. Agnico-Eagle added C$2.92 to C$51.92, and Goldcorp rose C$1.25, or 3.9 percent, to C$33.18.

The group of gold companies had tumbled for the past three sessions, amounting to losses of nearly 10 percent.