Sub-level caving is an efficient and safe mining method.

无底柱分段崩落采矿法是一种高效安全的采矿法。

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Practice shows that the parameters were effective, the grouting result was satisfactory, and laying a foundation for safe mining.

工程应用实践表明，锚注加固参数设计正确，锚注加固效果明显，为矿山安全生产提供了保障。

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For a long time, the safe mining of our country's coal resources has been seriously affected by a primary factor which is water inrush from coal seam floor.

长期以来，煤层底板突水一直是严重影响我国煤矿资源安全开采的一个主要因素。

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Radiation is a threat to human health at every stage of the process, from uranium mining to plant operation (even in those new ultra-safe plants) to waste disposal.

ECONOMIST: A renaissance that may not come