The Monument Bay Project is located in the Archean Stull Lake Greenstone Belt, in Northern Manitoba, Canada. This thesis focuses on the geometallurgy and gold mineralization of the Monument Bay Deposit in order to better understand the multiple gold mineralizing events and provide a pathfinder to gold mineralization. Traditional microscopy is used in combination with geochemical and mineralogical analytical techniques (Electron Probe Microanalysis (EPMA) and Energy-dispersive X-ray Spectroscopy (EDS)/(WDS) element map) and synchrotron geochemical techniques (synchrotron X-ray Diffraction (SR-XRD), synchrotron micro X-ray fluorescence (SR-µXRF) mapping, X-ray Absorption Near-edge Structure (XANES) Spectroscopy). Metallic gold (Au0) exists as free gold and inclusion gold, and no refractory gold (Au+1) has been found in the selected samples. As-1, which is the non-toxic form of arsenic, occurs in arsenopyrite and is the only form of arsenic in the samples. Free gold and inclusion gold have been found in porphyritic dacite and metasediments. Only free gold exhibit in metavolcanic rocks. Microscopic gold distribution is related to sulphide morphology. There is evidence for four sulphide generations identified from microscopy and EDS/WDS element maps: Ⅰ. Arsenopyrite 1 (Apy1); Ⅱ. Pyrite 1 (Py1) and Arsenopyrite 2 (Apy2); Ⅲ. Chalcopyrite (Ccp), Galena (Gn), and Sphalerite (Sp); Ⅳ. Pyrite 2 (Py2) and Arsenopyrite 3 (Apy3). The various Au/Ag and Au/Sb ratios identified using EDS point analysis suggest an episode of Au remobilization during sulphide formation because of changes in temperature and pressure. The spatial distribution of different types of sulphides in different veining events suggests there were three main gold mineralizing events. The majority of the gold was deposited as metallic gold in episode Ⅱ. This information is being applied by Yamana to understand the multi-episodic fluid history and environmental characterization of the Monument Bay project and will lead to a better understanding of the mineralogical expression of gold mineralization and geometallurgy at the Monument Bay Project
