Describe the features of underground mining methods.
(i)In this method, vertical shafts have to be sunk, from where underground galleries radiate to reach the minerals.
(iii)It requires specially designed lifts, drills, haulage vehicles, ventilation system for safety and efficient movement of people and material.
(iv)This method is risky.
(v)Poisonous gases, fires, floods and caving in lead to fatal accidents.