* TSX falls 158.80 points, or 1.32 percent, to 11,836.86 * All 10 main sectors decline * Index down 4.8 percent on year * Gold-mining shares slip with bullion price * BlackBerry climbs 2.8 percent By John Tilak TORONTO, June 24 (Reuters) - Canada's main stock index slumped on Monday, hitting a 10-month low, as anxiety about China's economic growth helped weaken commodity prices and fuel declines in shares of gold and energy producers. The market, which has been roiled by the U.S. Federal Reserve's plans to tighten monetary policy, extended its slide from last week, when it lost 1.6 percent. Worries about a crisis in the Chinese banking system and the ability of the country to deal with a slowing economy have intensified. Those concerns caused the price of bullion to drop about 1 percent and triggered a 4.2 percent fall in shares of gold miners. The Canadian market, with its large exposure to materials and energy stocks, has been reacting sharply to news out of China, a major destination for resource exports. "The markets are in a risk aversion phase. They are going to take a wait-and-see approach," said Youssef Zohny, portfolio manager at Stenner Investment Partners, a unit of Richardson GMP. Investors are trying to re-price Chinese economic growth and liquidity concerns to some extent, he said, adding they were more than anything looking for stability in commodity prices. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 158.80 points, or 1.32 percent, at 11,836.86, after reaching 11,759.04, its lowest level since August 2012. The index is down 4.8 percent since the start of the year, offering a contrast to solid gains made by other major global indices, such as the S&P 500. Canadian investors in general see no clear direction, said Matt Skipp, president of SW8 Asset Management. "You're invested in a financial system that's based off monetary policy, you're watching your yield securities plunge, and your equity portfolios don't give much comfort." Every major sector on the index was in the red on Monday. The materials sector, which includes mining stocks, gave back 3.8 percent. Gold-mining stocks declined 4.2 percent. Barrick Gold Corp fell 2.4 percent to C$17.28. The miner plans to lay off up to a third of its corporate staff at its headquarters in Toronto and other offices. Goldcorp Inc stumbled 3.8 percent to C$24.64. Energy shares lost 1.2 percent. Oil prices hit a three-week low earlier in the session but recovered as record flooding in Canada's main oil producing province threatened exports to the United States. Suncor Energy Inc was down 1.4 percent to C$30.36, and Canadian Natural Resources Ltd dropped 0.1 percent to C$29.35. Financials, the index's most heavily weighted sector, were down 0.5 percent. Insurer Manulife Financial Corp fell 2.9 percent to C$16.24 and played the biggest role of any single stock in leading the market lower. But smartphone maker BlackBerry, which will report quarterly earnings later this week, added 2.8 percent to C$14.75.