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In early oil exploration, drilling rigs were semi-permanent in nature and the derricks were often built on site and left in place after the completion of the well.
In more recent times drilling rigs are expensive custom-built machines that can be moved from well to well.
Each has its advantages and disadvantages, in terms of the depth to what it can drill, the type of sample returned, the costs involved and penetration rates achieved.
Some types included are Rotary cut, Rotary Abrasive, Rotary Reverse, Cable Tooling, and Sonic Drilling.
These rigs use the same technology and equipment as the oil drilling rigs, just on a smaller scale.
The drilling mechanisms outlined below differ mechanically in terms of the machinery used, but also in terms of the method by which drill cuttings are removed from the cutting face of the drill and returned to surface.
Underground mining (hard rock) uses a variety of drill rigs dependent on the desired purpose, such as production, bolting, cabling, and tunnelling.The term "rig" therefore generally refers to the complex equipment that is used to penetrate the surface of the Earth's crust.Small to medium-sized drilling rigs are mobile, such as those used in mineral exploration drilling, blast-hole, water wells and environmental investigations.There are many types and designs of drilling rigs, with many drilling rigs capable of switching or combining different drilling technologies as needed.Drilling rigs can be described using any of the following attributes: Rigs are differentiated by height based on how many connected joints of drill pipe they are able to "stand" in the derrick when it is out of the hole.