Sand, gravel and crushed stone form a group of industrial minerals known as “aggregates”. These materials are necessary for concrete, road base and coverings, and construction fill. Most producers near metropolitan are relying more on crushed stone than on sand and gravel because sand and gravel are found mostly in river valleys. Stone quarries can be operated with much less visual impact and take up less space than a large sand and gravel operation. Locating aggregate resources close enough to the urban corridor to provide product at a reasonable price is a constant problem in much of Colorado. Sand and gravel represented 77 percent of Colorado’s total aggregate production.
To left: Table Mountain Quarry, producing rock from the Dakota Sandstone to be used as rip-rap and road base.