Question

Read the following statements about ‘open-cast mining’ and choose the correct option:

1. It is the cheapest way of mining.
2. It occurs close to the surface.
3. It requires specially designed drilling machines.
4. Safety equipment is relatively low.

Options

• Only I, II and III are correct.

• Only I, III and IV are correct.

• Only II, III and IV are correct.

• Only I, II and IV are correct.

Answer 1

Only I, II and IV are correct.

Explanation:

Open‑cast (surface) mining is the easiest and cheapest method for minerals that occur close to the surface because overburden is removed and extraction is rapid; overheads such as safety precautions and equipment are relatively low. Specially designed drills and lifts are needed in underground (shaft) mining, not open‑cast.