USEP Mining 1 mock exam
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4 Terms
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Percussive cum rotary drilling
a drill that penetrates the ground due to the resultant action of both percussive and rotary motions. The percussive action produces a vertical impact on the drill rod to break particles. The rotational motion exerts a force on the bit head to penetrate into the rocks.
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Point load strength index test
a laboratory test where a piece of rock is held between two conical plateus of a portable lightweight tester. It is rather quick and can be conducted on regular rock cores or irregular rock fragments.
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