Copper $ 5.5035 / lb 0.29%
Brent Crude Oil $ 61.91 / bbl 2.21%
Palladium $ 1830 / ozt 1.95%
Crude Oil $ 57.88 / bbl 2.21%
Natural Gas $ 3.872 / Btu -5.12%
Silver Futures $ 68.53 / ozt 1.45%
Aluminum Futures $ 2947.5 / ton -0.74%
Micro Gold Futures $ 4472.6 / ozt 2.37%
Micro Silver Futures $ 68.52 / ozt 1.47%
Platinum $ 2098.1 / ozt 4.07%
Gold Futures $ 4472.2 / ozt 2.34%
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Joy roof supports - giants of longwall mining, produced the highest capacity roof support

International Mining | April 06, 2010 | 7:05 pm Energy Coal 

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. What makes these impressive coal production rates possible are...

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