Blasting in Underground Bituminous Coal Mines - Mining and Blasting
Blasting in Underground Bituminous Coal Mines - Mining and Blasting
Blasting in Underground Bituminous Coal Mines - Mining and Blasting
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<strong>Blast<strong>in</strong>g</strong> <strong>in</strong> <strong>Underground</strong><br />
Bitum<strong>in</strong>ous <strong>Coal</strong> M<strong>in</strong>es
Introduction<br />
The purpose of this program is to<br />
review the Safe blast<strong>in</strong>g<br />
procedures for shotfirers <strong>in</strong><br />
underground bitum<strong>in</strong>ous coal m<strong>in</strong>es.
Topics of Discussion<br />
Stor<strong>in</strong>g Explosives <strong>and</strong> Detonators<br />
Exam<strong>in</strong><strong>in</strong>g the Blast Area<br />
Conta<strong>in</strong>ers for Explosives <strong>and</strong> Detonators<br />
Charg<strong>in</strong>g the Shot<br />
Fir<strong>in</strong>g the Shot<br />
Responsibility After the Shot
Stor<strong>in</strong>g Explosives <strong>and</strong><br />
Detonators<br />
In a magaz<strong>in</strong>e constructed of non-conductive<br />
materials<br />
Placed <strong>in</strong> a dry location<br />
Out of the l<strong>in</strong>e of the blast<br />
Separate magaz<strong>in</strong>es for explosives <strong>and</strong> detonators<br />
Well rockdusted<br />
At least 25 feet from roadways <strong>and</strong> any power<br />
source<br />
On <strong>in</strong>take air<br />
Outby last permanent stopp<strong>in</strong>g
Exam<strong>in</strong><strong>in</strong>g the Blast<br />
Area<br />
Visual exam<strong>in</strong>ation for roof <strong>and</strong> rib<br />
conditions<br />
Remove any source of electrical current<br />
Check the area with a blaster’s<br />
galvanometer for stray current<br />
Check for methane
Conta<strong>in</strong>ers for explosives <strong>and</strong><br />
detonators outside magaz<strong>in</strong>es<br />
Constructed of non-conductive<br />
materials<br />
Substantial construction<br />
Separate conta<strong>in</strong>ers
Charg<strong>in</strong>g the shot<br />
Check the depth <strong>and</strong> direction of the bore<br />
holes<br />
Check the depth of the undercut (If used)<br />
Br<strong>in</strong>g necessary equipment to blast<strong>in</strong>g area<br />
Determ<strong>in</strong>e the amount of explosives needed<br />
Determ<strong>in</strong>e the number <strong>and</strong> type of detonators<br />
Make the primers <strong>and</strong> load the boreholes<br />
Wire the shot
Charg<strong>in</strong>g the shot<br />
Check the shot for cont<strong>in</strong>uity<br />
Connect the leg wires to the connect<strong>in</strong>g wires<br />
Connect the connect<strong>in</strong>g wires to the blast<strong>in</strong>g<br />
cable<br />
Check for methane<br />
Make certa<strong>in</strong> all persons are clear the blast<strong>in</strong>g<br />
area<br />
Post warn<strong>in</strong>gs around the area
Fir<strong>in</strong>g the shot<br />
Check cont<strong>in</strong>uity through the blast<strong>in</strong>g cable (150<br />
ohms or less)<br />
Sound a warn<strong>in</strong>g - FIRE! FIRE! FIRE!<br />
Wire to blast<strong>in</strong>g mach<strong>in</strong>e <strong>and</strong> fire the round<br />
Shunt the blast<strong>in</strong>g cable<br />
Allow time for ventilation
Responsibility after the shot<br />
Exam<strong>in</strong>e the area lead<strong>in</strong>g to the blast area for<br />
loose roof, ribs <strong>and</strong> other dangers<br />
Check for methane<br />
Check the blast area for misfires<br />
If a misfire occurs, contact your supervisor
Few people can say , “ I was <strong>in</strong>jured<br />
dur<strong>in</strong>g an explosives accident ”<br />
Respect the power of explosives <strong>and</strong> detonators<br />
H<strong>and</strong>le with care<br />
Keep all wires shunted until wired <strong>in</strong>to the circuit<br />
Keep detonators away from stray current sources<br />
Only certified shotfirers who are tra<strong>in</strong>ed to use<br />
explosives are permitted to perform those duties