DWQ-2024-008719

July 1, 2024

Mr. Erka Naran
Kennecott Barneys Canyon Mining Company
4700 W Daybreak Parkway
South Jordan, Utah 84095

Subject: Issuance of Ground Water Discharge Permit UGW350017, Copperton Concentrator,
Salt Lake County, Utah
Dear Mr. Naran:
The 30-day Public Comment period closed on December 2, 2024 for the issuance of Ground Water Discharge Permit UGW350017 for the Copperton Concentrator. The only public comments received
were from Rio Tinto Kennecott regarding a typographical error that switched the Protection Standard for cadmium and copper, which was rectified for the final permit.

The final Ground Water Discharge Permit and Statement of Basis are enclosed. An invoice is being prepared and will be transmitted once it is complete.
If you have any questions or comments about the permit, please contact Benj Morris at [e-mail] or [phone].
Sincerely,
John Mackey, P.E.,
Director
Utah Division of Water Quality
JM/DJH/BAM/ch

Cc: Jay Quintanilla, Rio Tinto Kennecott Copper
Kiani Ellingson, Rio Tinto Kennecott Copper
Mazie Cox, Utah Department of Environmental Quality
David Jamison, Utah Department of Environmental Quality
Ron Lund, Salt Lake County Health Department
Wayne Western, Utah Department of Natural Resources

Enclosures (4): 1. UGW350017 Final Permit 2024 (DWQ-2024-008718)
2. UGW350017 Final SOB 2024 (DWQ-2024-008715)
3. UGW350017 Table 2 (DWQ-2024-008716)
4. UGW350017 Table 2a (DWQ-2024-008717)