This shift is due to both improved safety standards and technology as well a move away from underground mines towards surface mining and controversial mountaintop-removal mining.
这种数据上的提高在于安全标准的提升和技术的进步，同时，地表开采和富有争议性的削山开采也使得地下开采也逐渐走到地上。
Along with the underground mining of mineral, the damage of the surface subsidence due to mining is gradually serious.
随着地下矿藏的开采，矿区开采沉陷所带来的损害日趋严重。
To control the surface movement caused by mining, the backfill mining method was adopted for underground mining in Sijiaying Changyu iron mine.
司家营常峪铁矿为控制采矿引起的地表岩移，采用地下开采充填采矿法采矿。
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