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Press Release

An isolated mountain range that formed nearly 2 billion years ago, the Black Hills of South Dakota carry a rich and complex geologic history. Join Mr. David Vardiman, project engineer at Sanford Lab, for our next Deep Talks, Thursday, May 12, at the Sanford Lab Homestake Visitor Center, 160 W. Main, Lead, S.D. The event begins at 5 p.m. with a social hour; the talk begins at 6 p.m.

In his presentation, "1.8 billion Years of Geologic History,” Vardiman looks at the geologic stratigraphy, or rock layers, of the Open Cut and the Northern Black Hills, it’s various styles of gold- and silver-bearing ore bodies and the dramatic effect climate has had on the region during its nearly 2-billion-year history. The talk will take place on the observation deck of the Visitor Center. In the event of inclement weather, the talk will be moved to the interior exhibit area.

Vardiman, a geological engineer for 40 years, worked at several mines across North American, including 21 years with the Homestake Mine. At Sanford Lab, he manages project excavation design contracts and ground support designs. He is also a Lead City Commissioner.

Deep Talks is free to the public. Donations to support community education are welcome. Light refreshments are sponsored by The Lodge at Deadwood Gaming Resort; guests aged 21 and older may sample craft brews from Crow Peak Brewery.

Sanford Lab is operated by the South Dakota Science and Technology Authority (SDSTA) with funding from the Department of Energy. Our mission is to advance compelling underground, multidisciplinary research in a safe work environment and to inspire and educate through science, technology, and engineering. Visit Sanford Lab at

Visit Sanford Lab Homestake Visitor Center at