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    4. What s probe hole?
    What s probe hole?

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    0  Views: 582 Answers: 1 Posted: 11 years ago
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      Mining


      The most widely used exploration technique is the drilling of probe holes. In this practice a drill with a diamond-tipped bit cuts a narrow kerf of rock, extracting intact a cylindrical core of rock in the centre. These core holes may be hundreds or even thousands of metres in length; the most common diameter is about 50 mm (2 inches).


      The hole left after extracting the material would be the probe hole. 


      http://www.britannica.com/EBchecked/topic/477567/probe-hole

      11 years ago. Rating: 1
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