Mining Geology, Mine Development and Surveying · Mine Development · 1 mark · Multiple choice
The drivage diagram assigns2.0,3.0 and1.0 kg per hole to Sections1,2 and3 respectively. Consecutive sections have25 ms delay. What is the maximum charge per delay in kg?
Count the holes in each simultaneously initiated section: four in Section1, four in Section2 and eight in Section3. Their separate charges are4×2=8 kg,4×3=12 kg and8×1=8 kg. The largest single-delay total is12 kg, B; distinct delay groups are not added together.
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