Hard rock lithium has several advantages over lithium brine. Firstly, hard rock deposits typically contain higher concentrations of lithium, which can make the extraction process more efficient. Secondly, hard rock mining is a more established and reliable method of extracting lithium, as it does not rely on unpredictable natural processes such as evaporation. Finally, hard rock lithium operations can be located in a wider range of environments and climates compared to lithium brine, which is typically restricted to arid regions.