Casper-based DISA Technologies has made the first sale of its mineral separation system, which can handle 100 tons of ore an ...

Many mines shut down in the '80s and '90s, and while environmental issues remain, using these sites to create new energy brings a sense of continuity." But the shift isn't without challenges.

There are about 500,000 abandoned mines in the United States, according to the Mine Safety and Health Administration, and these long-forgotten facilities can pose a variety of risks to people ...