There are four types of mines:
1. Surface mining
2. Underground soft rock mining
3. Underground hard rock mining
4. Drilling of blast holes in quarries and mines
There are four main types of blast holes:
Production Hole / Presplit Hole / Buffer Hole / Underground Production Hole

Down-the-hole drilling tools have the 
following subdivided applications 
in tunnel excavation engineering
1. Piling and micro piling
2. Foundation drilling
3. Environmental investigation hole
4. Blast hole

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.