| 1. | Mining operations by open-cut methods ceased in 1962 .
露天开采的矿山作业已于1962年停止。 |
| 2. | Economically minable limestone does not occur so frequently .
经济上值得开采的石灰石并不这样多。 |
| 3. | They were probably the first types of deposit ever worked by man .
它们也许是人类最早开采的矿床类型。 |
| 4. | Ip surveys aimed at finding the extent of a vein being mined .
IP测量的目的在于寻找正在开采的矿脉的延伸。 |
| 5. | In australia no exploitable uraniferous conglomerate has been discovered .
在澳大利亚，尚未发现可开采的含铀砾岩。 |
| 6. | Deposits which were formerly considered worthless can now be extracted .
过去认为不值得开采的矿藏现在能够开采了。 |
| 7. | The world as a whole could not gain more gold than was being mined each year .
整个世界每年获得的黄金不可能比每年开采的多。 |
| 8. | Practice of recovery working face crossing roadway mining
回采工作面跨巷道开采的实践 |
| 9. | Research on problems and measures of shanxi coal mining
山西煤炭开采的问题与对策研究 |
| 10. | Applicable conditions for combined bench working
论组合台阶开采的适用条件 |
