Long Hole Drilling

In Top Hammer long hole drilling, namely production drilling, the hole length is typically between 10 m up to 40 m and the hole size vary from 51 mm up to 127 mm. The long holes are drilled with extension rods. The rods can be either male-male type with separate coupling or male-female type with integrated coupling. To ensure best hole straightness top hammer drill tubes are used either as whole drill string or as single guide tube. In underground applications mainly water flushing and in surface applications air flushing is used to remove the drilling cutting from the hole. Long hole drilling is used in various mining methods like sublevel open stoping and VCR stoping. It is also used in special applications like cable bolting and slot and inverse raising.

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