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J. Robert Clark, Ph.D.
Chairman & CEO, Geologist/Geochemist
Dr. Clark received his PhD from the Colorado School of Mines, and he is the sole owner of Skyline Assayers & Laboratories. Dr. Clark is the inventor of the Enzyme Leach®, and he co-developed the MAGIC organic extraction system that has been widely used in a variety of analytical disciplines. He has been doing research related to or working in the mineral industry for 54 years.
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John “JP” Rosso
President
Known as “JP”, his career spans 40+ years in non-ferrous metals refining and manufacturing, working with a broad range of non-ferrous metals, including all (6) precious metals. Primary industries served have been mining, petroleum, and petrochemicals. Throughout his career , he has held simultaneous roles leading both domestic & international business development teams, in addition to laboratory, refining & production operations management.
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Meagan Sias
Laboratory Operations Manager
Meagan Sias has been employed in the mining industry since 2006. She has experience in management and quality control within several mining departments, including SX/EW, exploration, client services, and production samples. Meagan also has multiple years of experience with various laboratory instrumentation including ICP-OES and ICP-MS.
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Mike Jacobson
Chief Assayer, Arizona Assayer Emeritus, No. 52700
Mike has been with Skyline Labs since 2006. Graduate of the University of Arizona with a Bachelor of Science in Mathematics. Mike has over 15 years’ experience in laboratory operations, including precious metals fire assay technique, instrumental analysis by AAS, ICP-OES, ICP-MS, and analysis of Base Metals, Fluorine, Acid Consumption and Gypsum. Mike obtained his Registered Assayer Certification in 2011, and currently retains the status “Assayer Emeritus”.
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Bill Lehmbeck
Consultant, Geologist, Arizona Assayer Emeritus, No. 9425
Bill is a former co-owner of Skyline Labs. Bill was Manager of the Tucson operation from 1973 through 2000, and has served as consultant to the laboratory since 2001.
Meagan Sias, Robert Clark, JP Rosso, Mike Jacobson