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An attendee takes a closer look at a rock sample with a magnifier during the 37th annual Mineral Exploration Roundup at the Vancouver Convention Centre in Vancouver, Canada, Jan. 20, 2020. (Photo by Liang Sen/Xinhua)
An attendee takes a closer look at a rock sample with a magnifier during the 37th annual Mineral Exploration Roundup at the Vancouver Convention Centre in Vancouver, Canada, Jan. 20, 2020. (Photo by Liang Sen/Xinhua)