In addition, the design and calculation of mine-protected and enhanced the security of the entire substations.

此外还进行了防雷保护的设计和计算，提高了整个变电所的安全性。

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Mining the ore in pillars above the mine-out area comes down to the security of production, mining methods and putting in practice.

采空区上部预留矿柱的回采工作影响到整个矿山的安全生产、采矿方法及其实施。

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The practical application proved that this kind of assembled switch was helpful to enhance the security of production in coal mine and had high reliability and flexibility.

实际应用表明：该开关有助于提高矿井生产安全性，可靠性高，使用灵活。

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Stover, who was head of security at the Upper Big Branch Mine (operated by Performance Coal and owned by Massey Energy), was convicted of impeding the investigation of the mine explosion that killed 29 people on April 5, 2010.

FORBES: Massey Energy Employee Guilty of Obstruction, But Where Was Management?

On September 3rd four miners were wounded by rubber bullets when security guards fired on a hostile crowd at the gates of a gold mine near Johannesburg, the commercial capital.

ECONOMIST: South Africa