These mines accounted for more than one quarter of U.S. coal production in 2015.
IntelligenceMine Mining News
Some of the mines on this list get less than 100 mm of precipitation per year.
North America's highest mines are all concentrated in just four states
Chile's Invierno coal mine is, by far, the southernmost mine on the planet.
They are all located in just three countries: Norway, Russia and Canada.
With temperatures that can drop to nearly -50°C, these mines offer some of the most challenging working conditions in the world.
Average annual precipitation at many of these mines is zero.
One of these mines gets more than fives times the rain of Canada's rainiest city.
Eight of the world's highest elevation mines are in one country
Number one Barrick Gold's output drops in 2014, but fellow Canadian firm Agnico Eagle adds 30% to production ounces.