 Directory Of Illinois Mineral Producers And Maps Of 0 industrial sand quarries or pits 0 limestone and dolomite stone quarries and underground mines and one sandstone quarry 0 clay pits 0 peat pits 0 tripoli quarries The last two numbers identify the location of the pit or quarry within each county. For example 000 - 0 00 00 identifies the specific pit within the county 