Rare earth elements are an easy-to-find, hard-to-refine resource critical for everything from magnets and electronics to ...

Gone are the picks, the shovels and the canaries: Mining in Emerald and other underground operations has undergone a profound technological change. In the room-and-pillar method, tunnels as high as ...

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A team of geologists analyzed 3,500 samples taken in and around coal mines in Utah and Colorado. Their findings open the possibility that these mines could see a secondary resource stream in the form ...