KASHLOG LIMESTONE MINE
The Kashlog limestone mine of Ambuja Cement is located near village Kashlog in Arki Tehsil of Solan District in Himachal Pradesh. This mine was awarded Sita Ram Rungta Memorial award for social awareness for the year 1998-1999 by Federation of Indian Mineral Industries (FIMI). The total requirement of Ambuja cement’s Plant in Himachal Praedsh is met from this mine. Crushed limestone from mine to plant is transported by a 3.2 Km long closed overland belt conveyor system in an eco-friendly manner.
The exploitation of limestone is being carried out by highly mechanized open-cast mining system. The deposit has been opened up at two different locations and this facilitates simultaneous excavation of various grades of limestone. This approach helps in conservation of minerals by proper blending and solves the problem of slope stability by avoiding formation of series of benches at a particular place. The 10m height benches are planned to have a slope of 70° with an ultimate pit slope of 45°.
Drilling is carried out by deploying hydraulic drills for primary blasting purpose. It is resorted to at locations which are difficult to work by Ripping and Dozing techniques. Around 70% of the production requirement is met by drilling and blasting.
As the limestone deposit is Rippable at certain locations, a giant Ripper-Dozer has been deployed to produce limestone from such places. The adoption of Ripping and Dozing technique at mine has considerably reduced dependence on blasting and its associated problems.
The ripped / blasted and fragmented limestone is raised using 4.5 cubic meter hydraulic excavators and 5.74 cubic meter wheel loader and loaded to 35 tonne capacity Dumpers. The crushed material from crusher to plant is conveyed through 3.2 Km long closed conveyor belt system having adequate carrying capacity. The conveyor passes through 3 tunnels with varying lengths and gradients along three major ridges falling between plant and mine area. Load cells have been installed in tunnel to monitor creep displacement.