Visitors inspect ore samples during the 2017 Prospectors and Developers Association of Canada (PDAC) International Convention, Trade Show and Investors Exchange in Toronto, March 5, 2017. (Xinhua/Zou Zheng)
Visitors inspect ore samples during the 2017 Prospectors and Developers Association of Canada (PDAC) International Convention, Trade Show and Investors Exchange in Toronto, March 5, 2017. (Xinhua/Zou Zheng)