Such bottlenecks have been hampering the opening of new mines and the expansion of existing ones.

这些瓶颈已经妨碍新矿的开发和已有矿产的扩大。

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This offers important reference value for the cause analysis and comprehensive control of opening collapse in similar skarns mines.

对类似矽卡岩矿山井巷坍塌的原因分析与综合治理具有重要的参考价值。

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Such bottlenecks have been hampering the opening of new mines and the expansion of existing ones.

ECONOMIST: Commodities 1

But there's a 190-million-ton annual supply shortage in part due to strict environmental laws and bureaucratic delays that have slowed the opening of new coal mines.

WSJ: Graft Worries Slow India Coal Imports

Tyrone O'Sullivan, chairman of Tower Colliery, said the possibility of new mines opening was an opportunity to prevent the skills of Wales' miners from being lost.

BBC: NEWS | UK | Wales | Pit brings hopes of coal's return