The mining and quarrying industry consists of the mining, extracting, and processing of metallic and non-metallic minerals, including coal. Major products include crushed and broken stone, limestone, construction sand and gravel, potash, soda, borate, phosphate rock, kaolin, and ball clay. Crushed stone, sand, and gravel are also referred to as aggregates. Companies in this industry develop mine sites, mine and quarry nonmetallic minerals, and provide related support services. Demand in the mining and quarrying industry is mainly driven by construction and fertilizer spending.