The document discusses various topics related to blasting and mucking in mines. It describes different types of cuts used for blasting weaker vs tougher rocks. It explains the common pattern of charging blast holes, with 2/3 filled with explosive and the remaining 1/3 with stemming material. It provides a formula for calculating the number of blast holes needed based on the powder factor and weight of explosives and rock. Finally, it discusses mucking, the loading of exploded materials, and the main machinery used for this in coal mines: side discharge loaders and load haul dump vehicles.
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2. For blasting off the gallaries different types of
cuts are used.
Wedge cut/V cut,Pyramid/Diamond cut,Drag
cut,Fan cut are generally used for the blasting off
the weaker rocks as compared to that of Burn cut
which is uused for tougher rocks like
granite,basalt.
3. In any blasting hole a common pattern is
followed to charge it up.
So any hole’s 2/3 part is fillled with the explosive
material and upper rest part is filled with
stimming material as it provides free space for
the explosive which adds to the efficiency of
explosive.
4. We can calculate the no. of holes to be drilled
roughly with the help of powder factor as the
powder factor is somewhat definite for a
certain region.
Powder factor=
weight of rocks expoided(tonnes)/Weight of
explosive(kg)
5. For exlplosive weight we first find out the
volume of the block we are going to explode.
Now it is multiplied by density of material which
is surely known.
Now no. of holes multiplied by explosive in
each hole.
6. Now reversing this formula we get no. of holes
to be done.
Then by hit and trial we can adjust it also.
7. MUCKING IN MINES
Loading of the exploided material/excavative
materials is known as mucking.it is
mechanised in mines.
For coal mines generally two types of
machineries are used.
• SDL-Side discharge loader
• LHD-Load Haul Dump
8. excavator controls & power
pack
excavator in ‘park’ position under
jumbo
M.M.S. (mechanised mucking system)
