How is overburden handled during contour strip mining?

In contour strip mining, which is typically practiced in hilly or mountainous terrain, the overburden is removed to expose the mineral seam, creating a bench along the hillside.1

The handling of this overburden has evolved significantly over time:

• Historical Practice: In the past, blasted overburden spoil was simply pushed down the hillside, often resulting in barren, unstable landscapes.12
• Modern Practice: Current operations prioritize environmental responsibility and reclamation. Today, the soil is typically handled in one of two ways:
  • It is transported down the mountain to fill a designated valley in horizontal layers.1
  • It is replaced directly onto the working bench in areas where the coal or mineral has already been extracted.1

These practices are part of a broader commitment to land restoration, ensuring that mining sites are not left as abandoned, hazardous spoil banks but are instead reclaimed and revegetated as an integral part of the mining process.2