Mission: The National Stone, Sand and Gravel Association is the leading voice and advocate for the aggregates industry. We advance public policies that protect and expand the safe, environmentally responsible use of aggregates that build America’s infrastructure and economy. Vision: The National Stone, Sand and Gravel Association’s vision is a favorable public policy environment that fosters business growth for the aggregates construction materials industries. We are committed to rebuilding the nation’s aging infrastructure to ensure America’s economic prosperity and global competitiveness in the 21st century and beyond.