In November, crews hired by Colorado’s natural resources department descended onto a popular south Boulder trailhead, digging up patches of an underground coal seam that had been smoldering ...

If, when burning coal, it is not completely saturated with ... This must be supplied through crannies, cracks, or open seams, for it is chemically impossible that the fire will burn unless ...

Mountaintop removal is a radical form of coal mining in which the tops of mountains are literally blasted off to access seams of coal. It takes place in the Appalachian Mountains, one of the oldest ...

A large number of coal pillars were left behind during the mining of multi-coal seams. These pillars, when unstable, pose significant risks during both production and well closure stages in coal ...