Michael B. Mooiman has Master’s degrees in Chemistry and Business and a PhD in Metallurgical Engineering (University of Utah) and he has spent most of his career in the extractive metallurgy and precious metal business starting as a gold miner in South Africa. He has served as VP Production and General Manager for Metalor Technologies USA, one of the largest precious metal companies and refiners in the US and has published two book chapters and over 40 papers. He is also the holder of two US Patents for precious metal recovery. He is the President of Argo Advisors International, a consultancy and engineering company that specializes in the precious metals and extractive metallurgical industries. Mike has worked and consulted for major metallurgical research organizations and metals operations in the USA, South Africa, Europe, Asia, and Canada. When he is not consulting, he is a Professor in the MBA program at Franklin Pierce University, New Hampshire. He is a member of ACS and Co-President of the New England Chapter of the International Precious Metals Institute. During the summer of 2009, he was a Visiting Scholar at the US Federal Reserve Bank in Boston. In 2015 Mike was awarded a Fulbright Scholarship by the US Government for energy studies in Botswana Michael W. Hinds earned his Ph.D. in Analytical Chemistry. He is now retired from the position of Assay Chemist at the Royal Canadian Mint after 31 years. He has been instructing XRF short courses since 2005 and presently acts as technical consultant to the LBMA. He has published 46 papers and was co-author of the textbook Elemental Analysis, (De Gruyer, 2019). Wesley Johnson, Ph.D. Chemistry, BC Assayer Certificate, is now Retired from many years of experience in commercial, industrial and government laboratories as an analyst, manager, and Quality Control/Quality Assurance officer. He also taught Analytical and Environmental Chemistry at Okanagan University College, BC, Canada. Wes has published 23 papers and was co-author of two books: Rock and Mineral Analysis, 1981 and Application of ISO/IEC 17025 Technical Requirements in Industrial Laboratories – Method Validation in 2013.