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And now the bad news about heavy mineral sands. “The problem is they tend to have a lot of thorium,” which is weakly radioactive, says James Kennedy, president of ThREE consulting, a rare-earths advisory firm based in Missouri. “The thorium is the single biggest problem” with using the sands, he says. “If you were mining and processing monazites for rare earths, you would end up with hundreds and eventually thousands of tons of thorium-containing radioactive residues” per processing facility. The only markets for thorium are a couple of tiny ones for welding rods and some optics, he says, so “you have to store it.” And under the rules for nuclear material set by the U.S. Nuclear Regulatory Commission and the International Atomic Energy Agency, any stored radioactive material that doesn’t have a planned use or disposal pathway is considered nuclear waste. “So the [radioactive] liability suddenly far exceeds the value of anything you’ve mined and sold,” Kennedy says.

6月4日上午，国家主席习近平在北京中南海会见白俄罗斯总统卢卡申科。 新华社记者 黄敬文摄

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《消息报》获得的文件显示，有关工厂今年第四季度将接收组装一架S-70机体所需的全套复合材料零部件，2021年上半年还将获得另外两套这样的零部件。