Pinyon Plain Mine | Permit of Interest

This permit of interest online resource provides interested parties with easy access to information about the Pinyon Plain Mine, owned by Energy Fuels Resources (USA) Inc. (EFRI). Please note this mine facility was formerly known as Canyon Mine. In addition to an overview of the facility, environmental permitting information and supporting documents may be accessed, along with frequently asked questions (FAQs) and answers, and related resources from involved agencies.


The Pinyon Plain Mine is a uranium mine facility located in north central Arizona, about 6 miles southeast of the town of Tusayan in the Tusayan Ranger District of the Kaibab National Forest and currently owned by EFRI, approximately 9 to 15 miles south of the Grand Canyon in Coconino County. Currently, there is no ore production occurring at the facility. 

Pinyon Plain Mine operates in accordance with a United States Forest Service (USFS) Record of Decision (ROD) and detailed Plan of Operations (the USFS-approved facility Plan of Operations) approved by USFS and prepared after USFS completed its Environmental Impact Statement (EIS) under the National Environmental Policy Act (NEPA).

Environmental Protection Permits at Pinyon Plain Mine

ADEQ is the statutory regulatory agency for air quality, surface water quality and groundwater quality in Arizona. At this time, EFRI is operating with five ADEQ environmental protection permits related to water and air quality at the facility, which were issued in 2009:

  • One General Aquifer Protection Permit (APP) regulates a lined impoundment, which contains water pumped from the mine shaft and stormwater runoff from the facility property and is on a 5-year renewal schedule. ADEQ received an application from EFRI to renew this permit in July 2019.
  • Two General APPs, renewed in 2018, regulate two rock storage piles. These permits are on 7-year renewal schedules.
  • One Class II air quality permit regulates dust control measures at the site, is on a 5-year renewal schedule, and was renewed in 2016.
  • Stormwater runoff at the facility is actively managed under a Clean Water Act general stormwater permit.