5 common blasting methods in open pit mining

YUAN-PCR200-PRO

As we know, open-pit mining operations mainly include perforation, blasting, loading, transport, and discharge of soil. Blasting is an essential part of it, and it accounts for 15-20% of the total cost of open pit mining. And the quality of blasting directly affects the efficiency of equipment such as mining, transportation, and coarse crushing and the total cost of the mine. Today we would like to share some common blasting methods in open-pit mining and their application.

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​In open-pit mining, the commonly used blasting methods are as follows:

Classification by blasting method: shallow hole blasting, medium and deep hole blasting, chamber blasting, multi-row hole differential blasting, multi-row hole differential extrusion blasting, pot blasting, external application blasting, hole by hole blasting technology.

5 common blasting methods in open pit mining

1. Shallow hole blasting

Shallow hole blasting hole diameter is small, generally, about 30~75 mm, hole depth is typically 5 meters below, sometimes up to 8 meters or so, such as YUAN-PCR200-PRO top hammer pneumatic crawler rock drilling rig , hole depth can be increased.

Advantages and disadvantages of shallow hole blasting

Advantage

1, with flexibility and the full range of use;

2. For ore deposits with complex burial conditions and high ore grade requirements, separate blasting and separate mining can be carried out to reduce dilution rate;

3, drilling tool is relatively simple, easy to master;

4. Less preparation work;

5. The blasting ore has small lumpiness, which is easy to meet the requirements of loading and crushing;

6. Compared with chamber blasting and deep hole blasting, the use of explosives consumes fewer stars.

Disadvantage

cannot adapt to the needs of large-scale production, and in charge, wiring, overshoot this disadvantage several links are prone to loopholes.

Application:

Shallow hole blasting is mainly used for the production of small scale open pit mines or quarries, adit rock, tunnel excavation, secondary blasting, new open pit mountain bag processing, the formation of slope accessible single trench transport path and some other unique blasting.

2.Deep hole blasting
Deep hole blasting is the blasting method of drilling deeper holes with drilling equipment as the charging space of mine explosives.
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