Vulcan Materials Company - Official Site- product sand management ,Vulcan Materials Company is the nation’s largest producer of construction aggregates—primarily crushed stone, sand and gravel—and a major producer of aggregates-based construction materials, including asphalt and ready-mixed concrete.Medallion Resources Increases Private Placement to ... · Monazite is a rare-earth phosphate mineral that is widely available as a by-product from mineral sand mining operations. ... approval and other risks outlined in the Company's management ...