World-Class MVT Deposits of the Lower Midwest: Genesis, Exploitation, and Environmental Concerns

Welcome to this AIPG Texas Section Webinar, featuring an informative and wide-ranging presentation by Dr. Aaron Johnson on the geology, geochemistry, and environmental challenges associated with legacy mining districts and modern remediation practices in Mississippi Valley-Type deposits of Missouri, Oklahoma, and Kansas. The session highlights how historic ore deposits formed, how their mineralogy influences present-day environmental behavior, and what strategies are used to manage contaminated materials and mine waste. Dr. Johnson discusses the fate of removed waste, remediation pathways, and questions surrounding responsible parties, disposal options, and long-term site stability. Audience members explored topics such as sphalerite composition, silver content, tailings handling, the use of cement or limestone additives, and geologic controls on copper-rich zones. The presentation also prompted lighthearted moments—especially regarding the appearance of minerals compared to cake—while maintaining a strong focus on scientific clarity and practical field insights. Participants described the presentation as “excellent,” “very informative,” “well-rounded,” and “a great combination of geology, geochemistry, and remediation.” Many expressed appreciation for how clearly Dr. Johnson connected geologic processes to real-world environmental decisions. Continuing Education Disclaimer A link to the New York CEU assessment quiz was provided only to live attendees during the webinar. Watching this YouTube recording DOES NOT provide continuing education credits. CEUs are issued exclusively to participants who attended the live session and, for New York State, who completed the required assessment during the allotted time.