Zahurul
1 Answer
Colleen
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 | |
Top contributors in Astronomy & Space category
Unanswered Questions
Hitclub18 Club
Answers: 0
Views: 7
Rating: 0
Trending Now: Authors Trying Merchandising
Answers: 0
Views: 4
Rating: 0
88clbfree
Answers: 0
Views: 8
Rating: 0
J88
Answers: 0
Views: 4
Rating: 0
J88
Answers: 0
Views: 3
Rating: 0
J88
Answers: 0
Views: 3
Rating: 0
J88
Answers: 0
Views: 4
Rating: 0
J88
> More questions...
Answers: 0
Views: 4
Rating: 0