United States Lime & Minerals, Inc. conducts its business primarily through its lime and limestone operations. It is a manufacturer of lime and limestone products, supplying primarily the construction (including highway, road, and building contractors), industrial (including paper and glass manufacturers), environmental (including municipal sanitation and water treatment facilities and flue gas treatment processes), metals (including steel producers), roof shingle manufacturers, agriculture (including poultry producers), and oil and gas services industries. It produces limestone from its open-pit quarries and underground mines that it sells as crushed limestone or processes further to produce several higher-value lime and limestone products, including pulverized limestone (PLS), quicklime, hydrated lime, and lime slurry. It operates lime and limestone plants and distribution facilities in Arkansas, Colorado, Louisiana, Missouri, Oklahoma and Texas through its wholly owned subsidiaries.