Originally, it was a mountain 108 years ago and sandstone, quartzite and limestones were the oldest sedimentary rocks here . During construction of the mine, the owner cleaned up all the historic workings and ground water.
The company that was operating the mine had an automated early-warning sensors set up in the pit to check the stability and the movement of the slope. It was for this surveillance that helped the company to successfully predict the landslide, before-hand.
Though no loss