1.In their defense, the producers argue that in a region roughly the size of Florida, only 2. 5% of the land is mineable.
生产企业为自己进行了辩护，它们认为在这个面积大致相当于佛罗里达州的地区，只有2.5%的土地是可以开采的。
2.Its main mineable coal seam belongs to very thick coal seam. The coal seam texture and coal rank configuration are generally very complex.
主采煤层属巨厚煤层，其煤层结构和煤种结构一般都很复杂，按不同煤种进行分层开采，有利于煤炭资源合理利用。
3.Economically Mineable Reserve and Its Effect on Reserve Assets Value
经济可采储量及其对储量资产价值的影响
4.Discussion and analysis on planning issues of mine mineable coal quantity
矿井可采煤量规划问题探析