Mining has been a major part of Arizona’s history since well before it was granted statehood in 1912 and continues to be a major industry. ERC has assisted in many aspects of the development of the Hermosa Project in southern Arizona. Some of ERC’s contributions have included completing a dam breach analysis of the mine’s TSF facility to ensure all people and structures will be out of the inundation area in the event of a dam failure and conducting hydraulic and geomorphologic assessments on local ephemeral streams to determine the impact any discharges from the mine’s water treatment plant may have. ERC has also aided the mine in their water management through the development of stochastic water balance models.