There are 42 mine wells in four major mine areas, Jixi, Hegang, Shuangyashan and Qitaihe, in Heilongjiang province, China, 70% of which are high gas mine wells.

 
  • 黑龙江鸡西、鹤岗、双鸭山和七台河四大主要矿区有矿井42个,其中70%25都是高瓦斯矿井。
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