Question: Block caving studies indicate the rock mass has an associated bulking porosity of 0.015. A caving panel is developed 1,570 ft (479 m) below ground

Block caving studies indicate the rock mass has an associated bulking porosity of 0.015. A caving panel is developed 1,570 ft (479 m) below ground surface. Suppose the panel is A square feet in plan view, say, A = 20, 000 square feet (1,858 m2). How much ore (‘solid rock’) may be removed before subsidence just reaches the surface?

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