Coal layers buried under less than 100 m of sediment are usually mined with which technique?
A)underground mining
B)strip mining

Question

Quizplus · Accepted Answer

Strip mining is more appropriate for coal layers buried under less than 100 m of sediment as it involves removing layers of soil and rock above the coal seam to expose it for extraction. Underground mining is more suitable for coal seams that are located at deeper depths.

Coal Layers Buried Under Less Than 100 M of Sediment