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Aug 20, 2015 Attend Heap Leach Solutions 2015. September 13 to 16 in Reno, USA. Generally, the HL process involves the following steps Mine the ore. Pegmatites are more expensive to process than brine, but typically have higher ore concentrations (0.60%). Lithium is also extracted from sedimentary rocks, including clays, which can have up to 0.7% concentrations, but this is a much less common form of deposit than brines or pegmatites (Gruber, 2011).