Q. With regard to mining activities, which of the following statements is/are correct? Select the correct answer using the code given below:
The correct option is D
Statement 1 is correct: The surface mining also known as open-cast mining is the simplest method of extracting minerals near the surface, and it is the cheapest way. It has relatively low operating costs such as overhead costs like safety precautions are comparatively low. The performance is sizable and fast.
Statement 2 is incorrect: Underground mining or shaft mining is relatively more dangerous than open-cast mining. Vertical shafts are sunk according to this method, from where underground galleries radiate to reach the minerals. Minerals are collected from these passages and transported to the surface. For the safety and efficient movement of people and material, specially built lifts, drills, transport vehicles, ventilation systems are required. Poisonous gases, fires, floods and caving in lead to fatal accidents.