Public Comment Form

Commenting open: August 23, 2024 12:00AM AT - October 18, 2024 11:59PM AT.

Hermosa Project

Project Name : Hermosa Project Permittee: South32 Hermosa Inc. (formerly Arizona Minerals Inc. (AMI))

Project Location : Section 32 in Township 22S, Range 16E and in Township 23S, Range 16E; and un-surveyed Sections 4 and 5, of the Gila and Salt River Baseline and Meridian.

Project Site : (Latitude, Longitude): 31° 27' 59.4" N/110° 43' 35.8" W

Aquifer Protection Permit:  No. P-512235

Place ID: 18640 LTF : 101257 Amendment Type : significant amendment

Purpose: The purpose of this significant amendment is to amend the APP to reflect the following conditions:

  • Expand the existing lined tailing storage facility (TSF). With the expansion, this facility
  • will be referred to as Tailings Storage Facility 1 (TSF1).
  • Permit production tailings and other materials (Section 3.1) to be placed in TSF1.
  • Revise the Pollutant Management Area (PMA) to reflect the TSF1 footprint.
  • Update the Discharge Impact Area (DIA) to reflect the above revisions.
  • Update the Contingency Plan.
  • Update closure costs and financial assurance mechanism. This is a permit in AQUIFER PROTECTION PERMIT NO. P-51 PLACE ID 217930, LTF 90620 An Arizona Aquifer Protection Permit (APP) permit is required for any facility that discharges pollutants to the groundwater.


The Public Comment Period Originally was from from August 23, 2024 to October 10, 2024. The comment period is being extended from October 10, 2024 to October 18, 2024.



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Provide your comments below with respect to Arizona's Aquifer Protection Permit (APP) for the referenced project prior to the comment closure end date/time specified above. Any information (e.g., personal, business, contact, etc.,) that you provide on this comment form or in an attachment may be publicly disclosed. ADEQ encourages commenters to review the FAQ page before providing comments.

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