But in two or three months, he was back at work in the mines-except his personality had radically changed.
但2到3个月后，他重返矿井继续工作，然而他已不再是以前的他了。
West Virginia alone has had three major mining disasters in the last decade, all caused by explosions in coal mines.
在过去10年里，单西弗吉尼亚就发生过3次主要矿难，皆为煤矿爆炸引起。
These four types of gold bearing formations controlled the distribution of three types of gold mines in this region.
这四类含金建造控制了区内三类金矿的分布。
By then, more than five million persons were working in factories and mines. Another three million had jobs in the building industries and transportation.
此时，有五百多万人在工矿企业工作，还有三百万人正在建工厂和运输设施。
Letseng is one of the most productive mines in history — four of the world's 20 largest rough diamonds have been found at the mine, including the three largest found this century.
莱特森矿是历史上产量最高的钻石矿之一。目前全球20颗最大的原钻中有四颗产自这里，其中有三颗发现于本世纪。
Along with the mines toward deep level in China, the problems of soft rock are becoming more and more outstanding, especially controlling surrounding rock of three-soft coal seam.
随着我国煤矿开采越来越趋向深部，煤矿软岩问题便越来越突出，特别是三软煤层回采巷道的围岩控制问题。
There are three coal mines in Xin'an Coalfield. The Shanxi group irregular(2-1) coal seam has soft roof, soft coal and soft floor.
在新安煤田新建的三对矿井，主采煤层均为山西组2-1三软不稳定煤层。
This paper summarizes the status quo and distribution of three categories of environment-geological problems of the mines in the southwest region of China, and several control measures were proposed.
本文总结了西南地区三大类型矿山环境地质问题的现状与分布规律，并在此基础上提出了防治对策与建议。
This paper summarizes the status quo and distribution of three categories of environment-geological problems of the mines in the southwest region of China, and several control measures were proposed.
本文总结了西南地区三大类型矿山环境地质问题的现状与分布规律，并在此基础上提出了防治对策与建议。
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