June 24 (Reuters) - Canada's main stock index was unchanged on Monday, with losses in stocks of cannabis producers offsetting a rise in shares of precious metal miners as fears of an escalation in U.S.-Iran tensions spurred demand of gold.
* At 9:37 a.m. ET (13:37 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 8.49 points, or 0.05%, at 16,516.94.
* Investors globally will be on edge ahead of a high stakes meeting later this week between the presidents of United States and China at the G20 summit where they are expected to work out differences in trade issues.
* Six of the index's 11 major sectors were lower, led by the more than 1.3% drop in the healthcare sector .GSPTTHC .
* Canopy Growth Co WEED.TO fell 2.4%, the most on the TSX, as Cormark Securities cut price target on the cannabis maker's shares.
* The second biggest decliner was Aphria Inc APHA.TO , down 1.9%.
* The materials sector .GSPTTMT , which includes precious and base metals miners and fertilizer companies, added 0.5% as gold futures GCc1 rose 1% to $1,409.7 an ounce. GOL/ MET/L
* The largest percentage gainers on the TSX were Centerra Gold CG.TO , which jumped 2.2% and Yamana Gold Inc YRI.TO , which rose 1.9%.
* The energy sector .SPTTEN dropped 0.9% as U.S. crude CLc1 prices were down 0.3% a barrel, while Brent crude LCOc1 lost 0.8%. O/R
* The heavyweight financials sector .SPTTFS remains unchanged while the industrials sector .GSPTTIN fell 0.3%.
* On the TSX, 107 issues were higher, while 121 issues declined for a 1.13-to-1 ratio to the downside, with 10.16 million shares traded.
* The most heavily traded shares by volume were Royal Nickel Corp RNX.TO , Stornoway Diamond Corp SWY.TO and First Mining Gold Corp FF.TO .
* The TSX posted 12 new 52-week highs and no new low.
* Across all Canadian issues there were 38 new 52-week highs and 3 new lows, with total volume of 22.57 million shares.