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Author: Admin | 2025-04-27
Holes with precision and complete drill plan accuracy. Charging with explosives and stemming top Shotpile ready for loading Detonating the explosives The drilling and blasting sequence is shown schematically in the illustration above. If the drill rig operator is instructed to remain on a specific pattern, he must do so and not alter it unless authorized. The operator must also keep the blaster-in-charge informed of any changes in the rock while drilled, or indeed any mistakes, so that the blaster can make any necessary adjustments to the charge. The drill rig operator should tell the blaster about fractures or other abnormalities in the rock, changes in the strata and sand or mud seams in the rock, so that explosives can be loaded in the hole with these factors taken into consideration.The operator must also inform the blaster-in-charge of any 'short' holes – holes that are not drilled to the expected or planned depth. In other words, the driller is the blaster's eyes on the ground and, as such, can make or break a blasting operation. This information can also be extracted from the quality log available on SmartROC drill rigs. Quarry operators commonly design fragmentation blasts for safety, economy, ease of use at the primary crusher, and even public relations, but they often forget about quality.The blast layout must be properly engineered, documented and adhered to for maximum consistency. Varying the blast pattern may mean changes in the product size across the operation. Smaller shot rock, resulting in less crushing at the secondary and tertiary stages, may mean less improvement through crushing, so the mineral quality and/or physical properties of the product may be affected. Conversely, it is important to remember that size-reduction through crushing becomes more expensive as the material being crushed gets smaller, so in some respects it
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