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mining although subsidiary drilling is used to insert rock bolts or cable bolts or to facilitate exploration or mine drainage When drilling in rock the sharp end of the drilling tool or bit is driven into the rock by means of a dynamic (percussion in which the bit rotates slightly in response to each stroke) or static force (rotation

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Drilling Methods Used in Coal Mines Jess Pelez July 31 2013 - Last Updated: October 17 2019 2 minutes read Geotechnical core sample after logging For coal deposits like most other minerals drilling is a key to identifying in detail the grade and size of the resource both prior to mine development and during operations Mining operations employ a variety of drilling

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Reverse Circulation (RC) Drilling

The drill bit stem and pipe continuously rotate as the rock is being hammered Jets of air are forced up the drill hole on the side of the drill bit Rock dust and fragments known as cuttings or chips are carried by the strong airflow up through the middle of the bit into an inner drill pipe The air current is so strong that rock material can

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