Principle impacts to the development of mineral materials (e.g., sand and gravel) result from management that prohibits or limits (adverse impacts), or opens (beneficial impact) areas to mineral materials disposal. Such management commonly includes restrictions on surface-disturbing activities or closures to mineral materials disposal. Alternative B would result in the greatest adverse impacts to mineral materials, as this alternative closes 2,599,082 acres to mineral materials disposal, including areas within ¼ mile of riparian/wetland areas, Wild Lands (571,288 acres), and some ACECs (290,235 acres). Closures under alternatives C (348,215 acres), A (231,854 acres), and D (184,193 acres), respectively, would result in decreasing adverse impacts to mineral materials disposal.