Question

1. subsurface mining involves (4 points) following a vein with substance of economic value blasting the top reclamation following a bad bed

Explanation:

Sub - surface mining is the process of extracting minerals and other substances of economic value from below the Earth's surface. Miners follow veins of valuable substances. Blasting the top is more related to surface mining like strip mining. Reclamation is the process of restoring mined - out areas. Following a bad bed is not a correct description related to sub - surface mining operations.

Answer:

A. following a vein with substance of economic value