July 14 (Reuters) - Canada's main stock index opened

flat on Monday, as gains in technology and mining shares were

offset by losses in energy and healthcare shares, while the

latest threat of U.S. tariffs lowered investor risk appetite.

At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's

S&P/TSX composite index was flat at 27,021.48 points.