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Underground Gasification of Coal (UCG) is the gasification of coal in the seam underground, and, as such, avoids many of the expenses and disadvantages of traditional mining, whilst generating a fuel with a low emissions profile and the potential for simple carbon capture and storage. The ratio of worldwide inferred to proven mineable coal resources is about 6:1, indicating that the potential increase in recoverable resources using UCG is enormous, with a total gas volume estimate on the order of 6,900 Tcf.
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