A stoping method in which relatively thin blocks of ore are caused to cave by successively undermining small panels. The ore deposit is developed by a series of sublevel spaced at vertical intervals of 18-25 ft or 30 ft and occasionally more. Usually only one or two sublevels are developed at a time, beginning at the top of the ore body.
Conditions:-
- This method is used for thick and extra thick ore body.
- When the ore body is weak and moderately soft.
- When the hanging wall and footwall are weak.
- When the ore body is horizontal or has moderate stope.
- The ore body is moderately high grade.
Advantages:-
- There is no dilution of ore during the working.
- The grade of ore is not much affected.
- Less timber required in this method.
- There is less loss of timber.
- The impact of caving on the working is less.
- Workers stand on solid ore.
Disadvantages:-
- During withdrawal of alternate broken odd number slice is mixed with rock.
- The recovery is less as compared to top slicing.
- Sorting of ore is not possible.
- The ore pass may be jammed.
- Clearing of ore is difficult.
->Video explaining Sublevel Caving in details(Animation)
Source: A study of Metalliferous Mining Methods by Y. P. Chacharkar
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