In 2003, the marketing activities of Phoenix Cement Company and Salt River Sand and Rock were integrated under the Salt River Materials Group, which is also known as SRMG. It is one of the leading suppliers of masonry cement, fly ash and other pozzolans and natural gypsum products throughout Arizona and the southwestern United States. The company operates several manufacturing facilities. Salt River Materials Group also operates a fleet of railcars and maintains a network of rail-served bulk terminals. The company offers ready-mix concrete and concrete masonry products for paving and soil stabilization. It is associated with the American Coal Ash Association, American Concrete Paving Association and Arizona Concrete Contractors Association.