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प्रश्न
Read the following statements about ‘open-cast mining’ and choose the correct option:
- It is the cheapest way of mining.
- It occurs close to the surface.
- It requires specially designed drilling machines.
- Safety equipment is relatively low.
पर्याय
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.
MCQ
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उत्तर
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.
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