The Journal of Explosives Engineering - May/June 2022 - 30

Figure 3. Variation of burden along the west face.
Figure 4. Variations in explosive load and depth along the west face.
The north face of the blast was oriented perpendicular to
the alignment of the two crushers, yet it still provided flyrock
concerns related to the burden. The shape of the crest did not
vary as rapidly as on the west face, but the variation in the
burden at the crest versus the toe was much greater, reaching
up to a 75 ft (22.9 m) difference between the burden at the
crest versus the toe when the loose material against the face
was considered.
Figure 3 provides a visual representation of how the burden
along the crest and toe varied from hole to hole on the
west face towards the crusher. Also included in the graph is
the average burden for each blast hole described in the graph.
Explosive Load
Because of the burden variations on the free faces it was
recognized that custom loading of each blast hole along a free
30
face would be required. The custom loading was optimized as
the product to be loaded in the blast was a gassed emulsion.
This provided the opportunity to vary the density of the emulsion
to accommodate the variations in burden.
A pre-blast load sheet was created which provided the total
mass of explosives, product density, and stemming height
to be used in each blast hole. Amongst the blast holes along
the west face the total mass of explosives loaded in a hole
varied from 861 lb. (390 kg) to 1,357 lb (615 kg). (figure 4).
Custom loading of the blast holes was also employed for
the main body of the pattern. The need for this was due to the
variations in the bench height and hence the blast hole depth.
Since the mine wanted the blast to provide a level floor, it was
necessary to drill the blast holes in lengths varying from 29 ft
(8.8 m) up to 43 ft (13.1 m). The blast holes were therefore
loaded to maintain a uniform powder factor without risking
The Journal of Explosives Engineering
May/June 2022

The Journal of Explosives Engineering - May/June 2022

Table of Contents for the Digital Edition of The Journal of Explosives Engineering - May/June 2022

From the Executive Director
Reactive Ground Blast Management in a South Africa Open Pit Zinc Mine
Industry News
Calendar of Events
Explosives, 100 Years Ago, More or Less
Foundation News
Blasting Near a Crusher
Safety Talk
Regulatory Update
29th Annual Photo Contest
The Journal of Explosives Engineering - May/June 2022 - Intro
The Journal of Explosives Engineering - May/June 2022 - Cover1
The Journal of Explosives Engineering - May/June 2022 - Cover2
The Journal of Explosives Engineering - May/June 2022 - 1
The Journal of Explosives Engineering - May/June 2022 - 2
The Journal of Explosives Engineering - May/June 2022 - 3
The Journal of Explosives Engineering - May/June 2022 - From the Executive Director
The Journal of Explosives Engineering - May/June 2022 - 5
The Journal of Explosives Engineering - May/June 2022 - Reactive Ground Blast Management in a South Africa Open Pit Zinc Mine
The Journal of Explosives Engineering - May/June 2022 - 7
The Journal of Explosives Engineering - May/June 2022 - 8
The Journal of Explosives Engineering - May/June 2022 - 9
The Journal of Explosives Engineering - May/June 2022 - 10
The Journal of Explosives Engineering - May/June 2022 - 11
The Journal of Explosives Engineering - May/June 2022 - 12
The Journal of Explosives Engineering - May/June 2022 - 13
The Journal of Explosives Engineering - May/June 2022 - 14
The Journal of Explosives Engineering - May/June 2022 - 15
The Journal of Explosives Engineering - May/June 2022 - Industry News
The Journal of Explosives Engineering - May/June 2022 - 17
The Journal of Explosives Engineering - May/June 2022 - 18
The Journal of Explosives Engineering - May/June 2022 - 19
The Journal of Explosives Engineering - May/June 2022 - Calendar of Events
The Journal of Explosives Engineering - May/June 2022 - 21
The Journal of Explosives Engineering - May/June 2022 - Explosives, 100 Years Ago, More or Less
The Journal of Explosives Engineering - May/June 2022 - 23
The Journal of Explosives Engineering - May/June 2022 - 24
The Journal of Explosives Engineering - May/June 2022 - 25
The Journal of Explosives Engineering - May/June 2022 - Foundation News
The Journal of Explosives Engineering - May/June 2022 - 27
The Journal of Explosives Engineering - May/June 2022 - Blasting Near a Crusher
The Journal of Explosives Engineering - May/June 2022 - 29
The Journal of Explosives Engineering - May/June 2022 - 30
The Journal of Explosives Engineering - May/June 2022 - 31
The Journal of Explosives Engineering - May/June 2022 - 32
The Journal of Explosives Engineering - May/June 2022 - 33
The Journal of Explosives Engineering - May/June 2022 - Safety Talk
The Journal of Explosives Engineering - May/June 2022 - 35
The Journal of Explosives Engineering - May/June 2022 - Regulatory Update
The Journal of Explosives Engineering - May/June 2022 - 29th Annual Photo Contest
The Journal of Explosives Engineering - May/June 2022 - 38
The Journal of Explosives Engineering - May/June 2022 - 39
The Journal of Explosives Engineering - May/June 2022 - 40
The Journal of Explosives Engineering - May/June 2022 - Cover3
The Journal of Explosives Engineering - May/June 2022 - Cover4
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