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Lead and Zinc Under Ground Mining Methods

Lead and Zinc Under Ground Mining Methods. Sub Level Open Stopes Practiced at in Metalliferous Under Ground Mining Zawar Group of Mines. 
Hindustan Zinc Limited ( A Govt. of India Enterprise) Mochia Mines  Zawarmines Post Office Distt. Udaipur Rajasthan Pin 313901

SUB LEVEL STOPING

Sublevel means a level intermediate between the two main adjacend levels driven during the development stage. It is confined to the block or ore and does not extend to the shaft. 

Some autorites (eg. Higham) condiser it to be a variation of overhand stoping adapted to massive and wide ore deposits. However, the drill holes used in the stopes may be downwarde or in a ring or fan pattern and the stoping method is better treated as a seprate variety of open stoping.

The method involves the driving of subleves within the orebody to vertically divide a block to be stoped. Miners working within the sublevel opening drill a pattern of holes, long holes of re. Ore is produced b drilling and blasting longholes which may range n diameter from 50-200 mm  with length up to 90 m. The ore falls into he large open stope created by previous blasts. For deposits of thickness less than 20m, sub-level for deposits width greater than 20m, the sub-level for deposits of width greater than 20m, the stopes may be formed in transverse direction. Ie. From handwall to footwall (transverse stopes). The method requires considerable preparatory work prior to stoping
 

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