Assessment of critical mineral extraction from brines at Mount Meager, Southwestern BC, Canada

Abstract

Abstract Critical minerals, essential for the development and sustainability of clean energy technologies, are typically sourced through conventional CO2 intensive mining methods. This paper evaluates the potential of geothermal brines as a sustainable alternative for mineral extraction after geothermal energy production. A detailed case study of a Canadian geothermal field provides insight into the potential economic advantages of mineral extraction from brines. Water chemistry data from the Mount Meager geothermal field, which has one of the highest geothermal potentials in Canada, demonstrates that the fluids are rich in dissolved minerals and metals. Using reservoir physical information, Monte Carlo simulations, and appropriate probability distributions, our study addresses uncertainties in volumetric resource calculations. Taking into consideration flow pathways through the rock matrix, and available technologies with rates of mineral recovery up to 90%, results show promising reserves for minerals such as lithium, magnesium, and silica. The findings highlight the dual benefits of geothermal energy in Canada providing both a green energy source and facilitating critical mineral production. This dual utility can generate additional revenue fostering the development of geothermal fields, even those that are not viable for energy generation on their own, supporting Canada’s transition to a low-carbon economy.