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
| 12 years ago. Rating: 1 | |
Top contributors in Astronomy & Space category
Unanswered Questions
open88comse
Answers: 0
Views: 11
Rating: 0
Коллекция Кубань
Answers: 0
Views: 9
Rating: 0
mancluborgmx
Answers: 0
Views: 10
Rating: 0
Sunwin
Answers: 0
Views: 9
Rating: 0
Sunwin
Answers: 0
Views: 10
Rating: 0
ga6789marketing
Answers: 0
Views: 9
Rating: 0
Kasoca Fabric
Answers: 0
Views: 9
Rating: 0
NBET
> More questions...
Answers: 0
Views: 12
Rating: 0