From the above article:The majority of economically exploited IADs occur in Southern China, where the REEs are hosted in the weathered crusts of igneous, mostly granitic, bedrock7,8,12. They account for c. 35% of China’s total REE production and roughly 80% of global HREE supplies4,6, despite being low grade (0.05–0.2 wt% total RE2O3, incl. Y2O3) and relatively low tonnage compared to hard-rock REE deposits associated with carbonatites and alkaline igneous rocks1,14. Economic exploitation of IADs is viable through REE extraction by low-cost in situ or heap leaching8,12,15, a process that has had significant environmental impact in China6. The key requirement is that the majority of REEs are readily liberated using ionic solutions and are hence ion exchangeable10.
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