Question
Diffrentiate between opencast mining and underground mining.
Solution
|
Opencast mining |
Underground mining |
||
|
(i) |
It is also called surface mining. |
(i) |
The underground mines are deep below the surface. |
|
(ii) |
It is the easiest and cheapest way of mining. |
(ii) |
These are called shaft mines also. |
|
(iii) |
Overhead cost such as safety precautions and equipment is relatively low in this method. |
(ii) |
In this method vertical shafts have to be sunk from where underground gatherers radiate to reach the minerals. |
|
(iv) |
The output is both large and rapid. |
(iv) |
This method is very risky. |
