Published: July 1, 2025 |

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The Idaho Department of Environmental Quality is extending the public comment period for a draft permit for the Perpetua Resources’ Stibnite Gold Project.

The initial public comment period for Perpetua’s draft Idaho pollutant discharge elimination system permit was initially set for July 7. The public now has until July 22 to submit feedback, according to a press release from Idaho DEQ.

Perpetua Resources applied for a wastewater discharge permit for its industrial wastewater treatment facility, located in Valley County, approximately 12 miles east of Yellow Pine, Idaho.

The draft permit would authorize the discharge of treated industrial wastewater year-round to Meadow Creek and to the East Fork of the South Fork Salmon River for five years, the press release said. The permit identifies the pollutants of concern and the required limits for each pollutant, as well as monitoring and reporting requirements “necessary to ensure compliance with the permit and protect human health and the environment,” according to Idaho DEQ.

The draft permit and fact sheet are available for public review at DEQ’s public comment opportunities webpage HERE. Written comments on the draft permit and fact sheet will be accepted through 5 p.m. Mountain time on July 22, according to the press release.

Comments should address water quality considerations and include supporting materials where available, according to the press release. Comments should also reference Perpetua Resources Idaho, Inc., Stibnite Gold Project, and permit number ID0030066.

The public can submit comments electronically on DEQ’s website or via mail or email to:
Triffie Ransom
Idaho Department of Environmental Quality
Surface and Wastewater Division
1410 N. Hilton St.
Boise, ID 83706

email: .(JavaScript must be enabled to view this email address)

Source: KPVI

Perpetua Resources, through its wholly owned subsidiaries, is focused on the exploration, site restoration and redevelopment of gold-antimony-silver deposits in the Stibnite-Yellow Pine district of central Idaho that are encompassed by the Stibnite Gold Project. The project is one of the highest-grade, open pit gold deposits in the United States and is designed to apply a modern, responsible mining approach to restore an abandoned mine site and produce both gold and the only mined source of antimony in the United States. Further advancing Perpetua Resources’ ESG and sustainable mining goals, the project will be powered by the lowest carbon emissions grid in the nation and a portion of the antimony produced from the project will be supplied to Ambri, a U.S.-based company commercializing a low-cost liquid metal battery essential for the low-carbon energy transition. Perpetua Resources has been awarded a Technology Investment Agreement of $59.2 million in Defense Production Act Title III funding to advance construction readiness and permitting of the project. Antimony trisulfide from Stibnite is the only known domestic source of antimony that can meet U.S. defense needs for many small arms, munitions, and missile types.

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