CANADA STOCKS-TSX falls most in six weeks as resource shares slide

(Adds details throughout on market activity; updates prices) * TSX falls 80.2 points, or 0.49 percent, at 16,204.01 * Five of the index's 10 main groups decline * Energy falls 1 percent, materials down 1.4 percent * Enbridge falls 2.4 percent, TransCanada declines 2.6 percent TORONTO, Jan 25 (Reuters) - Canada's main stock index suffered its biggest drop since mid-December on Thursday as pipeline operators led declines for energy companies, while gold miners were pressured