METHOD OF DIVIDING THE MINEABLE ORE BODY A LONG THE DIP BY LEVELS OR HORIZONS.

Division of ore body includes drivage of inclines/shafts/ adits/levels/raises/winzes/cross cuts/drifts/hanging wall drives/ foot wall drives etc

Driving will be done by conventional / mechanized methods

Development of mine takes places by three ways

            1.Dip development/raise development

            2.Development along strike direction

            3.Development with cross cuts

Division of minable ore body take place by two methods

The methods are

            A. Conventional methods

            B. Mechanized methods

A.      CONVENTIONAL METHOD

·         Drilling ,blasting and manual loading

·         Jack hammers are used for drilling

·         These are generally leg mounted

·         The rate of penetration is 0.2-0.3m/min

·         Jack hammer employed in medium hard rock

B.       MECHANISED METHODS

·         Drilling will be done with the help of jumbo drills with one or more booms

·         So , that drilling operation will be efficient

·         Cycle time is reduced

·         Drills are mobile/crawler mounted

·         Loading is done by mechanical means

·         Load haul dumper in combination with locomotive haulage etc

·         In continuous mining type, road header and continuous miners can be used

·         Which eliminates drilling and blasting

·         The most mechanized method is, the use of tunnel boring machine

·         In hard rocks, drilling and blasting is convenient but, for medium hard rocks ,road heading machines can be used

·         Tunnel boring  machine used under special circumstances like

·1.Nature of rock

·2.Strength of rock

·3.Regularity

·4.Rate of drivage is most important factor