Sept 19 (Reuters) - Canada's main stock index gained ground on Wednesday as the materials group got a boost from higher gold prices and as the healthcare sector rose, led by cannabis producers.
* The materials sector, which includes precious and base metals miners and fertilizer companies, added 0.7 percent.
* Gold prices rose as the dollar weakened, indicating investors are starting to worry about the impact of the U.S.-China trade war on the U.S. economy, luring some buyers back into gold investments.
* The largest percentage gainers on the TSX were Aurora Cannabis, which jumped 8.8 percent followed by Canopy Growth Co, which rose 6.2 percent.
* At 10:07 a.m. ET (14:07 GMT), the Toronto Stock Exchange's S&P/TSX composite index was up 29.42 points, or 0.18 percent, at 16,225.46.
* Still, seven of the index's 11 major sectors were lower, led by the industrial sector's 1.5 percent fall.
* Shares of Canadian National Resources, Canadian Pacific Railway and SNC-Lavalin fell between 0.87 percent and 1.12 percent.
* Business and political leaders are increasing the pressure on Canadian Prime Minister Justin Trudeau to agree on a deal to renew NAFTA and drop his insistence that no deal is better than a bad deal.
* Foreign Minister Chrystia Freeland will hold fresh talks on the North American Free Trade Agreement with U.S. Trade Representative Robert Lighthizer in Washington on Wednesday as a U.S.-imposed deadline of Oct. 1 looms.
* On the TSX, 122 issues were higher, while 116 issues declined for a 1.05-to-1 ratio favouring gainers, with 44.09 million shares traded.
* Canfor Corp fell 5.5 percent, the most on the TSX, and the second biggest decliner was Interfor Corp, down 5.3 percent.
* The most heavily traded shares by volume were Aurora Cannabis, RNC Minerals and Hexo Corp .
* The TSX posted two new 52-week highs and two new lows.
* Across all Canadian issues there were 11 new 52-week highs and 18 new lows, with total volume of 73.80 million shares. (Reporting by Amy Caren Daniel in Bengaluru; Editing by Shounak Dasgupta)