Metallurgical coal, often overshadowed by its thermal counterpart, is experiencing a revival of sorts. Unlike thermal coal, ...

Two mining companies want to dig for coal under ... Longwall mines, on the other hand, are designed to collapse. The longwall machine is a giant drum that shears off the face of a coal seam ...

according to a January 2011 agency report cataloguing the effects of underground mining across Pennsylvania. Of those, 24 involve dewatered streams because of Bailey’s longwall machine. To date, most ...

Each of these dysfunctional systems funnel water to the longwall mining machine that investigators believe was the source of the deadly explosion. When they're functioning, the systems spray water ...

If used on two daily shifts, Emerald's longwall machine can eviscerate a 352-acre panel in about six months. Longwall mining is not only highly efficient in terms of coal extraction; it uses far ...

this journey reveals how these machines extract coal from the earth’s core with precision. Watch as roadheaders carve through solid rock and longwall mining techniques take shape. Learn about ...

Allegheny Metallurgical specializes in longwall mining, which the representative said is the most cost effective way to mine, as opposed to room or pillar mining. The technique uses a machine to ...

In longwall mining, powerful shearing machines drive back and forth across coal faces of up to 400 m in length, producing coal at rates of up to 1 t every second.

Now huge machines can perform what’s called “longwall” mining, chopping through coal not by the room but by the mile. The industry’s center has shifted too, paving the way for new ...

The Department of Energy describes longwall mining as an efficient technique in which a shearing machine cuts coal along a coalbed panel, after which the roof collapses. This collapse causes land ...