underground coal mine

基本解释

In the early days of underground coal mining, pit canaries often had short but valuable lives.
早期地下采煤的时候，矿井中的金丝雀常常拥有短暂而有价值的一生。
Generally, underground coal mining starts from one side (dip most) and ends at the other side of the property.
一般来说，地下煤炭开采从一个侧面（浸最开始）和结束在另一侧该财产。
While Shanxi provides the fuel that powers China's sizzling economy, thousands of acres of land are sinking because of the ravages of underground coal mining.
然而，在山西省向中国高速发展的经济提供燃料时，由于煤矿对地下的破坏，导致当地土地正在大面积下沉。

And while it's true that's shrinking as a percentage of Alpha's business, because we're exporting a lot more coal this year than we have in the past, our domestic steel companies are scrambling to get coal since metallurgical coal comes mostly from underground mining.
FORBES: Magazine Article
Coal mining accounts for 90% of sales at Joy's underground division and 33% at its surface-mining unit (copper and other ores account for the rest).
FORBES: The Big Dig
Louis-based Patriot Coal agreed to phase out its mountaintop excavationsand redirect its efforts back to underground mining.
FORBES: A Turning Point for Mountaintop Removal Coal?

煤矿井下
地下煤矿
The main disasters of underground coal mine are coal and gas outburst and gas explosion.
地下煤矿的主要灾害有煤和瓦斯突出以及瓦斯爆炸,而瓦斯爆炸主要由瓦斯积聚超限引起。
环境科学技术
煤矿井下