SW US mine rush collides with water limits

Water availability may become a major constraint on new copper and lithium mining in the U.S. Southwest, even when projects have legal water rights and permits. The key issue is the gap between having a right to pump groundwater and having a reliable, affordable physical supply over several decades.

Nevada is especially stressed, with many groundwater basins already over-appropriated or overpumped, while Arizona mining also depends heavily on groundwater. New mines are responding by buying existing water rights, recycling water, or using less water-intensive extraction methods.

Water probably will not stop mining development altogether, but it will increasingly determine which projects are viable, how they are designed, and how expensive they become.