KEGS Seminar - The cross-roads between exploration geochemistry and geophysics


Galvanoplastic Thoughts!
At the cross-roads between
exploration geochemistry and geophysics.


Réjean Girard 
IOS Services Géoscientifiques Inc.


Tuesday, January 19th, 2016
4:30 p.m.  

Gamble Hall
Geological Survey of Canada
615 Booth Street



In the exploration business, we used to say that geochemistry tells you what you have, and geophysics tells you where it is! So in the course of an exploration program, these are complementary, not competing. However, the conception of success and misfortune using these methods are very different, with geophysics having a much larger apparent success rate that geochemistry. There are plenty of reasons for such, namely geophysics being conducted by specialists, while geochemistry is typically run by whoever-is-available-at-the-camp! So, the first part of the talk will be about how geophysics and geochemistry must interplay, and where are the pitfalls where most companies stumble on. The importance of environmental processes and QA/QC issues will be briefly reviewed. On the second part, we will discuss how chemical and electrical processes are interrelated. At the moment there is metal migration to generate "anomalies", this involves cations and anions migration, galvanoplastic cells, electrolytic conductivity and electrical current. A case study conducted underneath a DC powerline will be used as trigger for thoughts. Understanding of these interplays can enable designing of more efficient exploration programs, such as discriminating fertile versus sterile IP anomalies to be drilled! The talk does not intend to bring any absolute solution, but to trigger multi-disciplinary discussions.



The lecturer, Réjean Girard, is a professional geologist who graduated from Laval University in 1985, and subsequently conducted  doctoral studies in mineral resources at UQAC, and practising in the field of mineral exploration since then. In 1992, he co-founded  IOS Services Geoscientifiques Inc, a consulting firm offering a large panoply of services to the industry, where he has been involved in more than 1350 projects.  A curious-minded geologist, the lecturer is geochemist solely by practice, and definitely not a geophysicist.