This webinar presents an overview of the EPA Office of Superfund Remediation and Technology Innovation (OSRTI) "Mine Site Optimization Initiative," and summarizes the lessons learned identified and best practices derived from independent optimization reviews performed on over 30 Superfund mine sites and mining district sites nationwide. The initiative is being performed under the EPA's National Strategy to Expand Superfund Optimization Practices from Site Assessment to Site Completion, which expanded and formalized optimization practices as an operating business model for the Superfund remedial program. The webinar will present case studies of mine site reviews performed, a summary of specific lessons learned identified for site characterization, and an update on the development of best practices resources to support consistent and safe approaches to characterization of mine sites with the potential for sudden, uncontrolled release of mining-influenced waters. To view this archive online or download the slides associated with this seminar, please visit http://www.clu-in.org/conf/tio/mining-opt_052417/