According to different external conditions, 16 fire blocks are divided into 3 types: mine vacant space fire, small coal-pit fire and seam outcrop fire.
根据外因条件不同将乌达矿区16个火区划分出大矿采空区起火、小煤窑起火和煤层露头起火3种类型；
2
The pit is being shut down because it no longer has enough coal that can be mined economically.
那个煤矿要关闭了，因为储量不足，难以经济开采。
《柯林斯英汉双解大词典》
3
Four miners were still trapped in a flooded coal mine in Shanxi. The accident occurred Friday afternoon in a coalpit run by the Lingshi coal mine.