The deposit model is summarized from Munk et al. (2016) and Houston et al. (2011).
Lithium is found in four main types of deposits:
• Pegmatites;
• Continental brines;
• Hydrothermally-altered clays;
• Oil-petroleum deposits within salty and brine waters underneath hydrocarbons reservoirs.
Continental brine deposits typically share the following characteristics:
• Located in semi-arid, arid, or hyper-arid climates in subtropical and mid-latitudes;
• Situated in a closed basin with a salar or salt lake. Salars or salt crusts are common where brines exist in subsurface aquifers;
• Occur in basins that are undergoing tectonically-driven subsidence;
• Basins show evidence of hydrothermal activity;
• Have a viable lithium source (e.g., high-silica volcanic rocks, pre-existing evaporites and brines, hydrothermally-derived clays, and hydrothermal fluids). The nearly 5,900-m-high resurgent dome of the Cerro Galán caldera may be an important recharge area for Salar del Hombre Muerto at ~4,000 m elevation;
• Have an element of time-stability to allow the leach, transport, and concentration of lithium in continental brines.
The majority of important lithium-rich brines are located in the “lithium triangle” of the Altiplano–Puna region of the Central Andes of South America and are classified either as “immature clastic” or “mature halite” types.
Houston et al. (2011) note that a key input is th ........
