In China national standards of coal classification, there only no type division of natural coke so far.
目前中国煤炭分类国家标准中，唯独对天然焦没有明确的分类指标。
Natural coke has good conditions of physical character, and contain abundant coalbed gas, is an ideal reservoir of gas.
天然焦具有良好的物性条件，含有大量的瓦斯气体，是一个理想的储气层。
In view of the mine actual situation of coal resource approaching exhausted, natural coke excavation craft was studied.
针对矿井剩余煤炭储量接近枯竭的实际情况，进行了天然焦开采工艺研究。
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