1. Who shall report all thefts and losses of explosives immediately upon becoming
aware of such thefts or losses?
[4]
2. Can someone transfer or accept transfer of any blasting licence or restricted
blasting licence?
[2]
3. Regulation 69 of Cap 24:02 states that (1) No person, other than the holder of an
importation permit issued under regulation 8, shall purchase or acquire explosives
otherwise than in accordance with these regulations. What is the penalty for
contravening this regulation?
4. Why is explosive density important?
5. At your operation how do you identify a blasting cable?
[4]
[4]
[4]
6. Give two precautions which must be taken to prevent fly-rock?
[4]
7. Identify the following explosives accessories?
[6]
Figure 1
Figure 2
Figure 3
8. Name five important points that apply when electric detonators are used for
blasting.
[10]
9. Name/mention any four (4) properties of explosives that a blaster should consider
when selecting the type of an explosive to use.
[4]
10. As a blasting licence holder in charge of a blast, how do you ensure that detonators
taken from the magazine are transported safely to the site? Mention 3
[3]
11. At a mine when blasting, how long must you wait after a misfire before returning
to check the site when using an electric detonating system?
[4]
12. Fill in the blanks
[4]
a. When a misfire is known or suspected, no one shall enter the blast area for…………….if safety fuses and blasting caps are used
…………….if any other type of detonators are used
b. Explosives with a density of less than one will…………………in water.
[2]
c. Two single wires or one duplex wire extending out from an electric detonator
is called………
[2]
13. Which of the following is considered to be a primer?
[6]
A. A 34ms delay detonator inserted into a cartridge of high explosive
B. Fuse crimped into a detonator
C. A detonator taped to a 10 meter detonating cord
14. At what distance from the magazine or authorized storage box is smoking not
permitted?
[2]
15. True/False
a) Detonators and other explosive material cannot be stored together. [2]
b) It’s all right to use waste oil products for the preparation of blasting
agents (ammonium nitrate-fuel oil mixture).
[2]
c) Leaving the engine running while unloading the explosives is an
example of a good practice?
[2]
d) During an electrical storm, it is unsafe to wire the explosive circuit
[2]
e) No exposed sparking material is allowed in cargo space of vehicles
containing explosive materials
f) Vehicles containing explosive material must be posted with warning
signs that indicate the contents and are visible from each approach [2]
g) A blasting licence holder shall charge holes only at the direction of the
manager.
[2]
16. At an open cast mine, a blasting licence holder prepared a charge and fired the
blast, after the re-entry period of 30minutes he approached the blast site despite a
cloud of fumes which was still visible in the air. He walked the blast, with his
assistants to check for misfires and he found two misfired holes. He extracted
reminisce of explosives consisting of emulsion, a damaged 400g booster attached
to a damaged detonator. He cleaned the holes and prepared another charge
consisting of the extracted explosives and tied them to new boosters and
detonators, and fired the charge.
a) State two contraventions of the Act committed by the Blasting licence
holder
[8]
17. What is the purpose of;
a) Stemming
b) Tamping
[2]
[2]
18. What are the duties of a miner in charge who is a blasting licence holder before
commencement of drilling operations on a working face under his charge?
[6]
19. Explosives have to be sensitive to purposefully supplied energy when you want to
initiate them. This sensitivity means they can be initiated when energy is
accidentally supplied. Give 5 examples of sources of unintended initiating energy
that you, as a blaster, must guard against at an open pit or quarry.
[5]