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types of drilling methods used in mining | boring | mining

The rods are Ni-Cr or carbon steel. Each rod has a male screw at one end and a female screw (screwed socket) at the other. Steel rods are usually in lengths of 3 m with nearly 38 mm x 38 mm square cross-section. For rotary drilling, described later, the rods are hollow, circular in cross section, have flush joints, and the length varies from 0.5 to 3 m.

The drilling tool used varies greatly in shape and cutting edge according to the type of ground to penetrate. For soft surface deposits which consist of alluvium, clay auger and worm auger may be used. These are given a rotary rather than a percussive motion. The straight chisel is commonly used for hard strata and the V chisel and T chisel, for very hard strata.

Every type of drilling requires a derrick which may consist of three or four legs and may be of wood or tubular steel. It is used chiefly for lifting the rods from the hole with the aid of a winch. In the mining localities, some petty drilling contractors undertake percussive drilling of 50 mm to 75 mm holes upto a maximum of 25 mm depth with the help of rods without installing any derrick.

types of drilling methods used in mining | boring | mining

The general arrangement for manual drilling is nearly like that shown in Fig. 3.3 except that water is not supplied through hose pipes under pressure and the cranck operated beam is replaced by a rocking lever connected to the drill rods. The drilling rods are given a percussive motion with the help of a corking level to which they are attached through a stirrup and a brace-head.

A brace-head is simply a pair of crossed handles fixed to the end of a short top rod which is screwed to the column of the rods. Two or three men press down the free end of the rocking level, thereby lifting the rods while one man turns them slightly by means of the brace-head.

hand held rock drilling for mining | efficient and

The first is to provide hydraulic drilling that helps you exceed your production targets in a safe way. Thanks to the hydraulic system you don’t have to worry about loosing production time due to poor air pressure at large depths. We have also gone out of our way to design a system that helps you avoid heavy lifting and wasting precious energy

The second mission is to provide good value for money, over a long period of time. To succeed we only use the best parts and materials available and combine them with active security systems that protect both you and the equipment. That’s the only way to do it

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