A study shows that the shafts of abandoned mines could serve as energy-storing gravity batteries. Just because a mine has been exhausted of its ore, that doesn't necessarily mean it has no value.

Hundreds of thousands of abandoned mines—about 550,000 in the U.S. alone—pose economic, environmental and safety risks. In some areas, these old shafts have caused collapses or polluted ...

Hundreds of workers remain underground at the Kloof gold mine near Johannesburg after a "shaft incident" occurred at Sibanye ...

And now, other countries, from Finland to Australia, are getting on board. Repurposing old mine shafts into gravity batteries is more than just a clever use of existing infrastructure—it’s a ...