Current Year Schedule
GSM seminars with slide show presentations are free and open to the public. They are presented by leading professionals in their fields and are aimed at learners from high school to adult. A question-and-answer session concludes each seminar. The labs, also free and open to the public, allow a hands-on learning experience and demonstrate the ideas and principles of geology and earth science. Live lectures and labs require no registration; just show up a few minutes early on the evening of the lecture.
Click on date of any seminar for attendance information and other details. For a printable version of our schedule of seminars and labs, click here.
Except as noted, in-person lectures during winter/spring 2026 are Mondays at 7:00 PM CT on the University of Minnesota campus, Keller Hall, Room 3-210. A lecture with (V) following its title is an online virtual lecture. For these, free registration is required by non-members; the instructions are supplied with the lecture description.
Our schedule is planned over 6 months in advance, so changes may occur. Always check this website shortly before each lecture for the latest seminar information.
Winter weather will come and snow might impact our lectures. The GSM will make any decision about cancelling or postponing a lecture due to inclement weather no later than 3:00 PM the day of the lecture. This information will be posted on the GSM home page (http://www.gsmn.org/). So check our home page shortly before each lecture in case there is a cancellation or a last-minute change. Also, we will e‐mail lecture postponement and cancellation information to our members.
Past seminars marked with * were recorded and the recording is available on the Geological Society of Minnesota YouTube channel. Subscribe to this channel for updates.
Seminar Details
Seminar Lab Date: December 8, 2025
Seminar Lab Subject: Origin and Mineralogy of the Sudbury Structure (V)
Seminar Lab Presenter: David Joyce, Owner & Proprietor, David K. Joyce Minerals
Link to Presenter https://djoyceminerals.com/meet-david-k-joyce/
Second Link to Presenter https://ca.linkedin.com/in/david-joyce-3b542722
Seminar Lab Location:
Virtual lecture 7:00 PM CT.
Participation instructions will be e-mailed to GSM members. If you are not a member of GSM and wish to attend this free seminar online, register as follows by 8 AM CT Monday, Dec 8: Go to the Contact menu above and select “Ask GSM”. In the form that appears, enter your name and e-mail address. Enter “Dec 8 lecture” in the subject line. In the message body, please enter the city and state or country from which you will view the seminar. You will receive instructions by e-mail prior to the lecture. Check your spam folder if the instructions do not appear in your in-box at least one hour prior to the lecture.
Seminar Lab Detail:
Summary: The Sudbury, Ontario mining area is one of the most mineral-rich places in the world having produced many billions of dollars of metal from interesting and rare minerals. The Structure hosting the mineral deposits is, in fact, a giant comet/meteor impact structure, the third largest astrobleme in the known history of the Earth. This presentation will go through the history of discovery of the valuable mineral deposits, the development of the understanding of the impact structure, resultant geology and the mineralogy of the deposits.
Biography: David Joyce has been a mineral collector since he was 12 years old, growing up in rock and mineral bereft Scarborough, Ontario. He left Scarborough at 19 years of age to attend the Haileybury School of Mines and, upon graduation, worked across Canada and the world, in the explosives and mining businesses. He later worked for mining and engineering contractors in the field of designing and building mining complexes and his last corporate position was Vice President, Business Development for SNC-Lavalin Engineers and Constructors. David was an adjunct Professor at the University of Toronto for eight years, is past vice-president of the Canadian Institute of Mining and Metallurgy (CIM), past Chair of the Toronto Branch of CIM, Past President of the Walker Mineralogical Club and a founder of the Young Toronto Mineralogists Club. He has been on the boards of directors for several public and private corporations.
David has split his life between Canada and Arizona for many years and his collecting interests reflect this, since he maintains both advanced Arizona and Canadian mineral collections. He is an avid field collector in both regions and a high proportion of both collections are personally collected.
David Joyce was a mineral dealer for many years, both part time and full time. He is retired from selling minerals and the business is now managed by his son Daniel D. Joyce through the website www.djoyceminerals.com.