Poor investment economy under current technical level In terms of economy and due to the factors including environmental protection,coal quality,coal seam thickness,geological conditions and mining scope,the potential of UCG business in China is mainly in mediumdeep coal seams.Due to its low calorific value and low value,brown coal has basically no open-pit mining or underground mining value,and can only be exploited and utilised by UCG once its burial depth exceeds 500 m.Most of the bituminous coal with a burial depth of less than 1,000 m also exceeds the economic lower limit of underground mining,and“underground coal gasification”becomes an important option.
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