Phase II hydrogeologic investigations were conducted at the Far West Site to characterize principal hydrogeologic units and structural features, hydraulic properties of units in the unsaturated and saturated zones, and the occurrence, movement, and chemical quality of groundwater. Hydrogeologic investigations were conducted in conjunction with geotechnical investigations by Klohn Crippen Berger (KCB) in support of the Resolution Copper Mining LLC (RCM) tailings prefeasibility assessment for the Far West Site.