Sept 12 (Reuters) - Canada's main stock inched marginally lower on Thursday as a slide in energy and healthcare shares offset optimism from a thaw in U.S.-China trade tensions and the European Central Bank's new stimulus measures.
* At 10:23 a.m. ET (13:53 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 7.71 points, or 0.08%, at 16,603.43.
* The energy sector .SPTTEN dropped 1.5% as U.S. crude CLc1 prices were down 2.6% a barrel, while Brent crude LCOc1 lost 2.6%. O/R
* The financials sector .SPTTFS slipped 0.2%, while the industrials sector .GSPTTIN fell 0.1%.
* The materials sector .GSPTTMT , which includes precious and base metals miners and fertilizer companies, added 1.6% as gold futures GCc1 rose 1.2% to $1,513 an ounce. GOL
* The largest percentage gainers on the TSX were Eldorado Gold Corp ELD.TO and Detour Gold Corp DGC.TO , up between 2% and 5%.
* Aurora Cannabis ACB.TO fell 8.5%, the most on the TSX.
* On the TSX, 112 issues were higher, while 120 issues declined for a 1.07-to-1 ratio to the downside, with 36.26 million shares traded.
* The most heavily traded shares by volume were Aurora Cannabis Inc ACB.TO , Canadian Natural Resources CNQ.TO and BCE Inc BCE.TO .
* The TSX posted three new 52-week highs and no new low.
* Across all Canadian issues there were 29 new 52-week highs and three new lows, with a total volume of 56.12 million shares.