* TSX falls 58.46 points, or 0.48 percent, to 12,180.90 * Goldcorp tumbles 3.1 percent, leading market decline * Saputo up 3.5 percent after announcing U.S. acquisition By John Tilak and Alastair Sharp TORONTO, Dec 3 (Reuters) - Canada's main stock index fell on Monday, led lower by gold mining and financial stocks, after weak U.S. and Canadian manufacturing data raised doubts about the economic outlook. U.S. manufacturing unexpectedly contracted in November, falling to its