NPR ventures into a Colombian emerald mine — which used to be more dangerous, with potential explosions inside and gunfights outside. The CEO, a former U.S. diplomat, says he wanted to change that.

The warehouse-like OPM space inside the mine has accumulated more than 400,000,000 individual records, spread across 26,000 file cabinets, in some places stacked 10 high.

The $925,000 price tag included mines and the homes of the men who worked there, a general store, a cemetery, the American Hotel and its bullet hole-pocked saloon and a brothel called “Lola’s ...

Listen: Inside the mines and megamachines of the Iron Range The Curious Minnesota podcast heads north to the mighty Mesabi, which helped fuel America's success story. By Eric Roper ...

Mining foreman R. Thornburg shows a small cage with a canary used for testing carbon monoxide gas in 1928. George McCaa, U.S. Bureau of Mines Never mind the gas—it was automation that got them ...

Wales' real-life Indiana Jones explores ancient 'lost' mine and makes dramatic discoveries. Ioan Lord is on a mission to put the metal mines of Mid Wales on a par with Eryri's slate landscapes.

NPR ventures into a Colombian emerald mine — which used to be more dangerous, with potential explosions inside and gunfights outside. The CEO, a former U.S. diplomat, says he wanted to change that.