There are four types of mines:

Down-the-hole drilling tools have the 

Including road construction, construction industry etc.
Down-the-hole drilling tools have the following subdivided applications in civil engineering and construction industries:
1. Piling and micro piling
2. Foundation drilling
3. Environmental investigation hole
4. Blast hole

Drilling serves two purposes:
1. Well
2. Geothermal well
Due to the different pump standards and geological conditions in each country or region, the depth and size required for each well are different.