Drilling·
Drilling blast holes: methods and equipment
Top-hammer and DTH drilling: when each is used and why accuracy matters.
Drilling accuracy directly affects blast quality: a deviated hole changes how the charge is distributed.
Methods
- Top-hammer — fast on benches at shorter depths
- Down-the-hole (DTH) — straight, deep holes in hard rock
What matters
- Diameter and depth to plan
- Hole straightness
- Set-out by survey
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