This regulatory impact analysis (RIA) estimates the costs, economic impacts, and benefits of the final rule applying Phase IV Land Disposal Restrictions (LDRs) to newly identified hazardous mineral processing wastes. EPA is promulgating standards for mineral processing wastes no longer exempt from Subtitle C requirements under the Bevill exemption. Under the provisions of today's proposal, previously exempt Bevill mineral processing wastes destined for disposal need to be treated to meet RCRA Universal Treatment Standards (UTS) before management or disposal in a land-based unit. At the same time, however, operators can reclaim hazardous mineral processing residues and store them in non-land based units prior to reclamation without complying with full Subtitle C requirements, under a new conditional exclusion.