Stone mining involves the extraction of granite, limestone or marble from quarries or mines. Ballast, a type of gravel or crushed rock, is also extracted from some mines.
Madhya Pradesh Pollution Control Board is conducting a hackathon “Self-reliant Gau-Shala-Waste To Wealth” to enable Gaushalas to become prosperous by earning money from waste like cow dung, cow urine etc. In this, online suggestions are being taken from students, people and organisations