The main insecure natural factors include: water, fire, gas, coal dust, wall collapse and so on. All of these are threatening the production safety of colliery enterprise.

其存在的主要不安全自然因素包括：水、火、瓦斯、矿尘、冒顶等，这些时时刻刻都在威胁着矿山企业的安全生产。

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Outburst prevention technique of excavating in coal seam will be directly concerned colliery safety production and excavates taking over.

突出煤层煤巷掘进防突直接关系到煤矿的安全生产和采掘接替。

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Strengthing the function of warning and safely is the guarantee of realizing the safety in production of the colliery to improve the safety management.

加强安全警示职能，提高安全管理是实现煤矿安全生产的保障。

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As the only approved manufacturer of safety lamps in Wales, ETW produces 21st-century safety lamps which are still in use at Tower Colliery and other mines throughout the world.

BBC: Site launch lights up mining past