TORONTO, May 14 (Reuters) - Canada's main stock index was little changed on Wednesday as a jump in shares of gold-mining companies, following a higher bullion price, was offset by weakness in energy and healthcare shares. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 6.08 points, or 0.04 percent, at 14,673.73. Six of the 10 main sectors on the index were in the red. (Reporting by John Tilak; Editing by James Dalgleish)