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PREPARE FOR A QUARRY BLAST SEC VI: APPENDIXES

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APPENDIX B: PRACTICAL EXERCISES AND SOLUTIONS

ELO 1 Prime Explosives (Practical Exercise )

Safety

Requirements

Hard hats must be worn at all times. Eye protection, gloves, and proper footprotection must be worn. Special care and attention must be taken when workingwith live explosives. Use only non-sparking tools around blast material. No smokingor open flames in the blast area

Risk

Assessment

Level

Low

Environmental

Considerations

Avoid unnecessary stripping and damage to vegetation and waterways. Control dustconditions and limit water erosion by dressing area at the end of each day. Avoidunnecessary equipment usage and follow established procedures for cleanup of fluidleaks. Restore site and surrounding areas as close as possible to the originalecological condition.

Special

Instructions

1. Explain to the students:

a. The practical exercise will consist of continuous practice.

b. Allotted time will be equally shared among all operators.

c. All steps will be practiced in sequence.

2. Ensure the students have applicable reference(s) and student guides.

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ELO 1 Prime explosives (Practical Exercise) (continued)

Requirements:

NOTE: This practical exercise is conducted with inert explosives.

a. Prime explosives with inert det cord.

(1) Uses the M2 crimpers and start approximately 1 from either end of the dynamite charge,punching four equally spaced holes through the dynamite cartridge.

(2) Rotate the cartridge 180 degrees after punching each hole to keep the hole parallel.

(3) Lace the det cord through the holes in the same direction the holes were punched. Ensurethe loops of the det cord are not pulled too tightly.

(4) Secure the det cord tail by passing it between the det cord lace and the dynamite charge.

b. Prime explosives with inert MDI.

(1) End priming

(a) Use M2 crimpers to make a cap well in one end of the dynamite charge.

(b) Insert an M15 blasting cap into the cap well.

(c) Tie the blasting cap and shock tub securely to the cartridge with a string or uses tape tofirmly hold the blasting cap in place.

(2) Side priming

(a) Make a cap well in the side of the cartridge at one end of the dynamite.

(b) Insert the blasting cap nearly parallel to the side of the cartridge. Ensure the explosive tipof the cap is as close to the middle of the cartridge as possible.

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ELO 1 Prime Explosives (Practical Exercise Solutions)

NOTE: There are no correct solutions for this practical exercise. The sole purpose of this

period of instruction is to provide the students with time to practice priming

explosives for a quarry blast.

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ELO 2 Load Boreholes (Practical Exercise)

Safety

Requirements

Hard hats must be worn at all times. Eye protection, gloves, and proper footprotection must be worn. Special care and attention must be taken when workingwith live explosives. Uses only non-sparking tools around blast material. Nosmoking or open flames in blast area.

Risk

Assessment

Level

Low

Environmental

Considerations


Special

Instructions


a. If more than one student is assigned to the same borehole, students willrotate, performing all practical exercise steps.

b. The practical exercise will consist of continuous practice.

c. Allotted time will be equally shared among all operators.

d. All steps will be practiced in sequence.


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ELO 2 Load Boreholes (Practical Exercise) (continued)

Requirements:

NOTE: This practical exercise is conducted with inert explosives.

1. Column Load Boreholes with Inert Det Cord Primers and Explosives

a. Remove all dirt and rocks from around the borehole opening.

b. Inspect the tamping rod for small rock chips clinging to it.

c. Insert tamping rod into the borehole to ensure the hole has not collapsed.

d. Insert the primed explosive cartridge into the hole.

e. Use the tamping rod to push the charge down the hole.

f. Press or tamps the charge to ensure good contact with the bottom of the hole.

g. Continue loading and tamping additional charges in the borehole until the amount ofexplosives per blast design is loaded.

h. Fill the remaining space in the borehole with stemming material once all explosives have been

loaded.

2. Deck Load Boreholes with Inert Det Cord Primers and Explosives



c. Insert tamping rod into the borehole to ensure the hole has not collapsed.

d. Insert the primed explosive cartridge into the hole.

e. Use a tamping rod to push the charge down the hole.

f. Press or tamps the charge to ensure good contact with the bottom of the hole.

g. Continue loading and tamping additional charges in the borehole until the proper amount ofexplosives are loaded below the crack or seam.

h. Fill the borehole with stemming past the crack or seam.

i. Insert a second primed charge and continue filling with explosives until the amount ofexplosives per blast design has been placed in the borehole.

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ELO 2 Load Boreholes (Practical Exercise) (continued)

j. Fill the remaining space in the borehole with stemming material once all explosives have beenloaded.

3. Column Load Boreholes with Inert Det Cord Primers and Explosives.



c. Insert the primed explosive cartridge into the hole.

d. Use the tamping rod to push the charge down the hole.

e. Press the charge to ensure good contact with the bottom of the hole.

f. Continue loading additional charges in the borehole until the proper amount of explosives areloaded.

4. Deck Load Boreholes with Inert MDI Primers and Explosives.



c. Insert the primed explosive cartridge into the hole.

d. Use the tamping rod to push the charge down the hole.

e. Press the charge to ensure good contact with the bottom of the hole.

f. Continue loading additional charges in the borehole until the amount of explosives per blastdesign is loaded.

g. Fill the borehole with stemming past the crack or seam.

h. Insert a second primed charge and continue loading with explosives until the amount ofexplosives per blast design has been placed in the borehole.

i. Fill the remaining space in the borehole with stemming material once all explosives have beenloaded.

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ELO 2 Load Boreholes (Practical Exercise Solutions)


period of instruction is to provide the students with time to practice loading

boreholes.

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ELO 3 Assemble a Nonelectric Firing Circuit (Practical Exercise #1)

Safety

Requirements

Hard hats must be worn at all times. Eye protection, gloves and proper footprotection must be worn. Special care and attention must be taken when workingwith live explosives. Uses only non-sparking tools around blast material. No smokingor open flames in blast area.

Risk

Assessment

Level

Low

Environmental

Considerations


Special

Instructions






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ELO 3 Assemble a Nonelectric Firing Circuit (Practical Exercise #1) (continued)

Requirements:

NOTE: This practical exercise is conducted with inert explosives

a. Assemble a nonelectric firing circuit with inert det cord.

(1) Lays out a ring main around the blast pattern.

(2) Attach additional branch lines as needed for multiple rows.

(3) Attache det cord lines from each borehole to the ring main or the branch lines with a girthhitch with an extra turn.

(4) Attach the initiator.

b. Assemble a nonelectric firing circuit with inert MDI.

(1) Select one of the front row end holes as the first hole.

(2) Connect the M15 surface cap from the first hole to the shock tube in the second hole of thesame row.

(3) Continue this process for the entire length of the row.

(4) Repeats steps (1) through (3) for each additional row.

(5) Connects hole 2 of row 1 with hole 1 of row 2 using an M11 fitted with an M9 cap holder.

(6) Repeat step (5) for each additional row.

(7) Attach the M2/M13 to the shock tube of the M15 blasting cap in hole 1 of row 1.

(8) Unreel the M12/M13 to the firing point.

(9) Visually inspect all connections before initiation of the charges for any problems that mightcreate a misfire.

(10) Attach the M81 fuse igniter.

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ELO 3 Assemble a Nonelectric Firing Circuit (Practical Exercise #1 Solutions)


period of instruction is to provide the students with time to practice assembling a

nonelectric firing circuit for a quarry blast.

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ELO 3 Prepare Explosives and Demolition Materials for a Quarry Blast (Practical

Exercise #2)

Safety

Requirements

Hard hats must be worn at all times. Hearing protection must be worn whileequipment is running. Eye protection, gloves, and proper foot protection must beworn. Special care and attention must be taken when working with live explosives.Use only non-sparking tools around blast material. No smoking or open flames inblast area.

Risk

AssessmentLevel

Medium

Environmental

Considerations


Special

Instructions






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ELO 3 Prepare Explosives and Demolition Materials for a Quarry Blast

(Practical Exercise #2) (continued)

Requirements:

NOTE: This practical exercise is conducted using live explosives.

NOTE: The method of priming explosives, loading boreholes, and assembling a nonelectric

firing system will be determined by the instructor based on site conductions.

Prepares explosives and demolition materials for a quarry blast.

a. Prime explosives.

b. Loads boreholes.

c. Assemble a nonelectric firing system.

d. Perform all operations within safety guidelines.

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ELO 3 Prepare Explosive and Demolition Material for a Quarry Blast

(Practical Exercise #2 Solutions)


period of instruction is to provide the students with time to practice preparing

explosives and demolition material for a quarry blast.

E02S6B

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