This video described the whole process of charging and blasting in opencast mining.
Procedure:
A drill jumbo during the construction of Citybanan under Stockholm, used for drilling holes for explosives As the name suggests, drilling and blasting works as follows:
*A number of holes are drilled into the rock, which are then filled with explosives.
*Detonating the explosive causes the rock to collapse.
*Rubble is removed and the new tunnel surface is reinforced.
*Repeating these steps until the desired excavation is complete.
The positions and depths of the holes (and the amount of explosive each hole receives) are determined by a carefully constructed pattern, which, together with the correct timing of the individual explosions, will guarantee that the tunnel will have an approximately circular cross-section.
During operation, blasting mats may be used to contain the blast, suppress dust and noise, for fly rock prevention, and sometimes to direct the blast.
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