Mariano Lake Mine Fact Sheets

Fact sheets providing site history and updates on the cleanup progress of the Mariano Lake Mine (Old Gulf Mine) on Navajo Nation.

• EPA Fact Sheet: Mariano Lake Mine (Old Gulf Mine) Removal Action Planning (pdf) (656.88 KB, May 2025)
  The U.S. Environmental Protection Agency (USEPA) has issued an action memorandum for a plan to clean up waste from historical uranium mining operations at the Mariano Lake Mine. This fact sheet presents background information on the Mariano Lake Mine, the cleanup option selected, and the next steps for cleaning up waste material.
• EPA Fact Sheet: Mariano Lake Mine (Old Gulf Mine) Site Update (pdf) (2.4 MB, October 2023)
  This fact sheet provides site history and update of the cleanup progress of the Mariano Lake Mine (Old Gulf Mine).