The overall objective of the planned Funding Opportunity Announcement is to support the Department of Energy’s current vision to secure diverse, resilient, domestic Critical Minerals and Materials supply chains by expanding the Critical Minerals Sustainability Program to fund additional front end engineering design Association for the Advancement of Cost Engineering Class 3 cost estimate studies for the recovery and refining of Critical Minerals and Materials, with a primary focus on production of high purity rare earth metals, or alternate forms, as required for critical supply chain use.