Given the very recent increased interest in UCG as a viable green energy technology I thought it timely to repost (#5249360 11/04/10) the link below. Reading this document will give newcomers to UCG a good unbiased grounding in the history of the various UCG methodologies.
http://www.coalonline.org/site/coalonline/content/Viewer/82189/7789/778900001.html/Underground-coal-gasification
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