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11 comments on Longwall Mining of coal

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Nate Hagens on January 23, 2006 - 2:27pm Permalink | Subthread | Comments top
Does the step from Room and Pillar mining to Longwall Mining and beyond (is there a beyond) decrease the EROI of what you get out? I know that Gevers in Beyond Oil projected that lower quality coal and higher energy inputs would result in a coal energy profit ration of .5 to 1 by 2040. Is the amount and type of coal and mining subject to law of diminishing returns more dramatically than that of oil?
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Heading Out on January 23, 2006 - 5:19pm Permalink | Subthread | Parent | Comments top
I am thinking I might do a post on coal quality and dirt and the need to clean coal, etc, in a couple of weekends to discuss this, since it is not a simple answer.  
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