Based near the
nation’s capital, 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.