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6 FAQs about [Underground mining down-the-hole drill construction video]
What is down the hole (DTH) drilling?
Among all the drilling method, Down The Hole (DTH) drilling is being used more and more widely and has very high efficiency for some cases. Here, we will introduce the specific application for DTH drilling as most import part of whole basic drilling knowledge. Mining RC – Exploration − Surface drilling − Exploration
What is underground drilling – mining application demand?
Underground Drilling – Mining Application Demands − Underground mining is a very competitive industry so productivity is a very important factor − Drilling accuracy is a must for good ore recovery and to avoid dilution − Drilling accuracy is also important for optimal blasting pattern, good fragmentation and cost effective down stream operations
What is DTH drilling used for in civil engineering?
In civil engineering DTH drilling is used for a lot of different applications − Blast holes at construction sites used for removal of rock in road and railway projects, construction of HE plants etc − Foundation drilling methods are used to reinforce or stabilize rock and soil in different construction projects Geotechnical drilling
How does DTH drilling work?
With DTH drilling, contractors can change the drill that they were using for the current directional bore to a rock drill when they encounter rock by connecting the drill with a compressor and a steerable hammer. Well drilling also needed changes to be made to rotary drilling when the well needed to take a turn.
What is a down-the-hole drill?
A down-the-hole drill, usually called DTH, is basically a mini jackhammer screwed on the bottom of a drill string.
How many types of holes are drilled in surface mining?
Three main types of holes are drilled in surface mining − Blast holes Hole diameter 115 – 229 mm (4½ – 9 in) Hole depth 6 – 20 m (18 – 60 ft) − Blast holes are production holes and will be filled with explosives − Drilling accuracy is important to obtain good and even distribution of the explosives in the rock