Guillaume Lesage was born in Quebec City, Quebec, in 1986. He graduated from Laval University in 2008 with a B.Sc. in geology. As part of his bachelor s degree, he did an undergraduate project in Tibet under the supervision of Dr. Réjean Hébert. There, he studied the geochemistry of Miocene intrusions in the Yarlung Zangbo suture zone. While studying at Laval University, he was president of the INRS-Laval SEG student chapter. After graduating, he worked as an exploration geologist in Timmins, Ontario, looking for nickel in the peridotites and komatiites of the Abitibi greenstone belt. Guillaume started his M.Sc. at the University of Alberta in the fall of 2008 under the supervision of Dr. Jeremy Richards. His research focuses on a gold deposit located near the Buriticá community, about 75 km northwest of Medellín (Colombia) and about 5 km west of the Romeral fault system, in the Antioquia department. The objectives are to determine (1) the age of mineralization, its paragenesis, and the source and temperature of the mineralizing fluid; (2) the age and geochemistry of intrusive and volcanic rocks found within the study area; and (3) the age of potassic and phyllic alterations. The aim of this analytical work is to build a model explaining the formation of the Buriticá gold deposit. Required knowledge includes the age and geochemistry of the fresh rocks and the alterations associated with the mineralized veins; the source, salinity, pressure, and temperature of the mineralizing fluid; the paragenetic sequence in the veins; and the crosscutting relationships between lithologies. This study is important for understanding the metallogenic evolution leading to the formation of the Buriticá gold deposit. The results will be used to build a framework for mineral exploration applicable to the entire Romeral suture zone.