Abstract: An oxy-fuel combustion gas generator combusts fuel with oxygen to produce high temperature steam and carbon dioxide. A lithium brine is introduced into the gas generator to cause at least a portion of the water within the lithium brine to be converted into steam. A steam separator downstream from the gas generator separates steam and carbon dioxide from a resulting higher concentration lithium brine. This higher concentration lithium brine can then be beneficially utilized. Furthermore, the steam and CO2 from the steam separator can be utilized to generate power, such as by a turbine, can supply CO2 for use within the lithium extraction plant or within a geological formation for sequestration away from the atmosphere and/or for enhanced recovery of lithium brine from the geological structure.