43. Let the Rocks Talk - Mineral Systems and Deposit Models in Northern Sweden

Exploration and mining have a long history in northern Sweden, host to the Skellefteä, Bergslagen, and Kiruna Mining Districts.  What are the underlying characteristics that make this region rich in mineralization?  We explore the metallogeny, mineral systems and deposit models that guide exploration for base metals and gold.  What has changed over the last century and what do we know now that will help guide the next discoveries?  First, we talked to Nils Jansson, Associate Professor at Luleå Tekniska Universitet about the metallogeny and diverse mineral occurrences in the Skellefteä, Bergslagen, and Kiruna Mining Districts. His academic and industry background helped us understand how and why some deposit types occur together and the challenges of using genetic models. An open mind, an understanding of the complexities present and a mineral systems approach are all important in guiding exploration for deep, hidden deposits.  In our second story, Mac Persson, an exploration geologist from Boliden Minerals shares the history, culture, and challenges in the Skellefteä District.   The world-class mining district has been explored for over a century and hosts numerous deposits, dominantly VMS mineralization, but also porphyry, orogenic gold and magmatic nickel deposits.  He talked about the significance of Au-rich VMS deposits for Boliden Minerals and how the company explores them using innovative methods and legacy data. Both of our guests were field trip leaders at the SEG 2022 Base, Precious and Critical Metal Deposits of the Paleoproterozoic Skellefteä District, Sweden.  They have extensive experience and perspective on working in this challenging terrain.Our music is Confluence by Eastwinds.Come join us in Salt Lake City, Utah for SEG 2026, September 30th to October 3rd. You can expect world-class technical content, including iconic ore deposits and the geological processes of North American Cordillera. The program balances applied case studies, framework geology, and technological innovation. The conference offers a unique opportunity to connect, learn, and help shape the future of economic geology. See you there.