Question

Which of the following methods of extraction is the most damaging to the environment?
A)
surface mining
B)
subsurface mining
C)
placer mining
D)
sonar mining
E)
none of the above

Answer 1

The ORCA Sonar will measure up to two density interfaces simultaneously, either bed level or RAS blanket 

hence its
A .surface mining.

Answer 2

Option A i.e Surface Mining is the correct answer.

Surface Mining method of extraction is the most damaging to the environment. It leads to loss of biodiversity or landscape and habitual destruction, soil erosion, pollution especially air pollution, destruction of agricultural land, contamination of water etc.