Underground Metal Mining and Methods

1. The distance between levels on the plane of the orebody is called?

2. The mineral is transported downwards in different sections to the lower level and all the ore is carried to the crusher at the lowest level through?

3. In metal mines a shaft is always sunk in?

4. Two or three compartment raising is limited to?

5. The length of the back if the dip of the ore is 30 deg?

6. The maximum thickness of the ore body that can be worked with the room and pillar method is?

7. Among the methods of open stoping, the method that lends to large scale mechanisation in drilling, blasting, loading, and transporting is?

8. The limiting gradient of the slusher haulage is?

9. The most common method of raising adopted in majority of metal mines is?

10. should not exceed is?

11. Recovery of ore by shrinkage stoping is?

12. The method of raising suitable for moderate lengths and inclination of 40 to 60 deg with horizontal with strong strata and wall rock is?

13. As the haulage road has to be straight and wide with smooth curves it is in the?

14. Raising by longhole drilling is limited to?

15. In manual method of raise driving the monthly progress is nearly?

16. The roadways driven from the shaft from different horizons for access to the mineral deposit are?

17. In dry powder extinguisher, which chemical is used?

18. The method of stoping for massive ore bodies with weak walls and low-grade ore is?

19. The method of stoping for massive ore bodies of high-grade ore with weak walls, and the ore is mined out in a series of horizontal slices from the top of the orebody is?

20. Overburden heaps should be at least ....m away from the coal face of a quarry?

21. Alamak raise climber can be used only where inclination of the raise from horizontal is?

22. The interval between levels depending on several points vary from?

23. The method of stoping suitable for thin ore bodies, flat dip, and both ore and walls are strong is?

24. The dilution in sublevel caving is?

25. The method of stoping for high-grade ore with walls of the ore body and back of the stope so weak that they do not stand without support even for a week is?

26. The thickness of the bed in open stoping is?

27. Level interval is more in the case of?

28. The process which involves reacting the ore with a liquid solvent that will dissolve the mineral at low or moderate temperature and pressure is called?

29. Extraction of the ore minerals mechanically or hydraulically from floating vessels is known as?

30. The method of stoping for narrow and steeply dipping ore with any type of ore and walls is?

31. Breast stoping is employed for stoping ore bodies not more than?

32. The method of stoping best suited to low grade deposits of horizontal or mild dip and of thickness up to 5m is?

33. The method of stoping suitable for steeply dipping, reasonably firm ore, mixed graded ore with irregular boundaries, and where ground surface is to be protected from subsidence is?

34. The method of stoping successfully applied to all dips from horizontal to vertical is?

35. The daily progress of raise by Alamak climber is?

36. The pillar left to support the upper level is called?

37. In vertical crater retreat method the spherical charges are used L

38. To maintain suitable working space for workings, the muck pile is shrunk in shrinkage stoping by?

39. The open raising is limited to?

40. The method of stoping where the orebody is a thick vein type ore, and walls are strong and steeply dipping (i.e., footwall steeper than the angle of repose of the broken ore) is?

41. Open stope method is used for ore of?

42. The method of stoping applied for massive deposits of large horizontal extent is?

43. The method of stoping suitable for thick ore body, strong ore, stable hanging and foot wall, and steeply dipping ore is?