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International Exposition of Agate- Daily Speaker & Presentation Schedule

With well-known names like Phil Stevenson, Josh Ritter, Joe Dehmer, Pat McMahon and more, you can't miss this showcase of invaluable agate lore & science. From the fluid-dynamics of thundereggs to how to start your own agate collection, and a few exotic adventures in "agate licking," meet the miners and get the dirt. Learn first-hand the ancient and modern mining techniques, the subtleties of banding, how mining and processing work and more,from collectors and those with working production mines. Question & Answer session after each discussion. 

Schedule is subject to change without notice.

Thursday June 6th, 2019

  • 10:30 a.m. Joe Dehmer explores new theories on Agate Genesis, following up on his recent article featured in the March 2019 issue of Rock and Gem .
  • 12:00 p.m. Rob Burns on Australian and Indonesian Agate. Rob has been collecting agates all over Australia and Indonesia for decades, and shares his unique insights and adventures in rock hounding in exotic locations.
  • 1:30 p.m. Al Celli & Roland McIntosh have extensive knowledge of Kentucky agates. They will explain where the agates are found, how they are mined, and the characteristics of great Kentucky agates.
  • 3:00 p.m. Steve Bussan , a native of Michigan, has collected agates and copper minerals all his life. His specialty is the rare copper replacement agate, especially those from the area of the Wolverine Mine of the Upper Peninsula of Michigan.
  • 4:30 p.m. Holger Quellmalz is from Germany, and a real expert regarding Moroccan agates. Herr Quellmalz has traveled to Morocco many times since the 1970s in search of Aouli, Bouhamza, and Agouim agates, as well as agates from the Tizi n’Tichka Pass area. He will differentiate among the various kinds, and explain what characteristics affect their value.

Friday June 7th, 20119

  • 10:30 a.m. Luis De Los Santos is perhaps most famous for naming the beautiful condor agate of Argentina and was the first to bring them to the United States. He has dealt in many kinds of agates from Argentina for decades. He will show examples of them and describe their origins.
  • 12:00 p.m. Jason Brown is known for bringing larger Moctezuma agate specimens to the avid collector. Pastel colors and wider bands distinguish the Moctezuma from other northern Mexico varieties. He will discuss the areas where they are found and his mining and production processes.
  • 1:30 p.m. Alan Meltzer’s specialty is gem dinosaur bone. This fossil, rarely replaced by agate, is most frequently found in the Four Corners region of Utah. He will describe the structures, what to look for, how to characterize the values, and display great specimens.
  • 3:00 p.m. Dietrich Mayer of Germany is the author of More Exquisite Agates, and famous for his many years of experience in sourcing and describing agates from Germany. He will talk about the many locations of agates in Germany, including Idar-Oberstein, one of the first agate gem factories in the world.
  • 4:30 p.m. Larisa Shanaeva a collector of many kinds of agates, will talk about agates from Russia.

Saturday June 8th, 2019

  • 12:00 p.m. Pat McMahan, author of Agates with Inclusions and collector of many kinds of agates, will focus on agates of the Southwest USA, especially those of Arizona. He will also explain many inclusions and pseudomorphs in agates.
  • 1:30 p.m. John D. Marshall author of The Other Lake Superior Agate, will discuss Lake Superior agate, especially its unusual varieties and characteristics, and their origins and current locations.
  • 3:00 p.m. Philip Stephenson is a miner and frequent contributor to Rock and Gem Magazine. He will be discussing his mining processes, discoveries, fun anecdotal miner stories and showing many examples of nature’s treasures he has unearthed at his plume agate and jasper claims in the Oregon Owyhee region and northern Nevada. Additional how-to videos, mining adventures and his world class Morrisonite Jasper collection can be found at his website:

Sunday June 8, 2019

  • 11:00 a.m. Joshua LeCram Ritter will speak about his various travels to Africa to obtain agate for collectors and lapidary from countries including Mozambique and Malawi.
  • 12:30 p.m. Robert Cooper discusses beginning an agate collection.