Mining involves extraction of minerals from the ground/earth. The main mining activities include natural gas exploitation in Lari constituency by Carbacid Company Limited and extraction of ballast, hardcore, gravel, murram, sand and building stones in Juja, Gatundu South and Gatundu North Constituencies.
The arid parts of the county mainly Ndeiya and Karai in Limuru and Kabete constituencies contain diatomite deposits that are unexploited. There is therefore great need for investment in the area to determine economical viability of the deposits.
Exploration for other mineral deposits also needs to be enhanced to determine whether other deposits are available especially in the arid areas of Ndeiya and Karai.