In which of the following aspects surface mining is different from underground mining 1 Surface mini...........

Geography Minerals

In which of the following aspects, surface mining is different from underground mining?

1. Surface mining is a cheaper way of mining minerals that occur close to the earth's surface.

2. Surface mining is riskier due to the occurrence of poisonous gases, fires, floods, and cavings.

Select the correct answer using the code given below.

1 only

2 only

Both 1 and 2

Neither 1 nor 2

Depending upon the location of mineral ores, mining is of two types:
Surface Mining:

It is also known as open cast mining or quarrying.
Sedimentary or bedded ores lying close to the surface are called open cast mines.
It is the easiest and the cheapest way of mining minerals that occur close to the surface. Hence statement 1 is correct.
At present, about 90 percent of all mines and 99 percent of non-metallic mines are surface mines.

Underground Mining or shaft method:

In contrast to the open cast mining, it is inherently risky due to the possibility of poisonous gases, fires, floods and cavings that can lead to fatal accidents. Hence statement 2 is not correct.
In this kind of mining, vertical or inclined shafts and horizontal tunnels are made and connected with underground galleries.
Rocks are extracted and transported to surface through these passages.
It requires specially designed lifts, drills, haulage vehicles and ventilation system for safe and efficient movement of people and materials.