Drift run to the working face (Underground Mine and Shaft Works)
A development drift sequence: an incline ramp rising into a level run of rock, timbered and steel arch supported sections and a shotcrete lined length leading to a dead end working face, with the drilling jumbo set up at the face, a roof bolter behind it and ventilation duct...
- 格式
- GLB
- 文件大小
- 787 KB
- 三角面
- 20,724
- 许可
- CC0 1.0