The National Stone, Sand, and Gravel Association has co-sponsored with IME safety and security guidelines for ammonium nitrate (AN). NSSGA is the world's largest mining association by product volume. Its member companies represent more than 90% of the crushed stone and 70% of the sand and gravel produced annually in the U.S. and approximately 110,500 working men and women in the aggregates industry. During 2012, a total of two billion metric tons of crushed stone, sand, and gravel, valued at $17.4 billion, were produced and sold in the United States. The guidelines capture existing regulations covering AN in one document and augment those requirements with best practice standards for ensuring the safety and security of AN from manufacture to end use.