• • Operations Plan 2023 (PDF, 33 MB)
  • Reclamation Plan 2023 (PDF, 28 MB)
  • DEQ Approval of Revision 23-001 – Operations Plan (PDF, 309 KB)

• • Amendment 12 (6560′ – Proposed)
  • Amendment 11 (RDS)
  • Amendment 10 (6450’)

• • Projected 2025 Disturbance Area Figure (PDF, 10 MB)
  • Projected 2025 Disturbance (PDF, 72 KB)
  • Primary Crusher Figure (PDF, 6 MB)
  • DEQ Proposed Five-Year Bond Determination (PDF, 222 KB)
  • Proposed Five-Year Bond Calculation (XLSX, 2 MB)
  • MR Responses_Bond Review Letter (PDF, 6 MB)
  • DEQ Final Five-Year Bond Determination (PDF, 185 KB)

• • 2023 Annual Progress Report for Operating Permit (PDF, 45 MB)
  • 2022 Annual Progress Report for Operating Permit (PDF, 73 MB)
  • 2021 Annual Progress Report for Operating Permit (PDF, 35 MB)

• • Field Inspection Report 11-08-2024 (PDF, 6 MB)
  • Field Inspection Report 09-04-2024 (PDF, 9 MB)
  • Field Inspection Report 09-04-2024 Addendum (PDF, 227 MB)
  • Field Inspection Report 06-25-2024 (PDF, 7 MB)
  • Field Inspection Report 11-29-2023 (PDF, 2 MB)
  • Field Inspection Report 09-28-2023 (PDF, 2 MB)
  • Field Inspection Report 09-06-2023 (PDF, 2 MB)
  • Field Inspection Report 06-20-2023 (PDF, 3 MB)
  • Field Inspection Report 11-22-2022 (PDF, 2 MB)
  • Field Inspection Report 07-18-2022 (PDF, 1 MB)
  • Field Inspection Report 06-07-2022 (PDF, 3 MB)

• • 2023 Annual Inspection Report – Rev 0 (PDF, 38 MB)
  • 2023 MR Corrective Action Plan (PDF, 506 KB)
  • 2022 Annual Inspection Report – Rev 0 (PDF, 26 MB)
  • 2022 MR Corrective Action Plan (PDF, 3 MB)
  • 2021 Annual Inspection Report – Rev 0 (PDF, 54 MB)
  • 2021 MR Corrective Action Plan (PDF, 904 KB)
  • 2020 Annual Inspection Report – Rev 0 (PDF, 27 MB)
  • 2020 MR Corrective Action Plan (PDF, 906 KB)

• • Q1 2024 Tailings and Water Monitoring Summary (PDF, 2 MB)
  • Q4 2023 Tailings and Water Monitoring Summary (PDF, 3 MB)
  • Q3 2023 Tailings and Water Monitoring Summary (PDF, 2 MB)
  • Q2 2023 Water Monitoring Data Summary (PDF, 2 MB)
  • Q1 2023 Water Monitoring Data Summary (PDF, 3 MB)

• • Q1 2024 Piezometric and Deformation Monitoring Summary (PDF, 13 MB)
  • Q4 2023 Piezometric and Deformation Monitoring Summary (PDF, 12 MB)
  • Q3 2023 Piezometric and Deformation Monitoring Summary (PDF, 14 MB)
  • Q2 2023 Piezometric and Deformation Monitoring Summary (PDF, 20 MB)
  • Q1 2023 Piezometric and Deformation Monitoring Summary (PDF, 10 MB)

• • 2022 Data Analysis Report (PDF, 266 MB)
  • 2021 Data Analysis Report (PDF, 279 MB)
  • 2020 Data Analysis Report (PDF, 76 MB)

• Risk Assessment April 2024 Presentation (PDF, 10 MB)
• 2022 Risk Assessment Report (PDF, 6 MB)

• 2025 IRP Periodic Review

• Montana Air Quality Permit #1749-14 (PDF, 416 KB)

Seasonal Emissions Inventory

• 2024 Summer Seasonal Final Report (PDF, 147 KB)
• 2023-2024 Winter Seasonal Final Report (PDF, 151 KB)
• 2023 Summer Seasonal Final Report (PDF, 186 KB)
• 2022-2023 Winter Seasonal Final Report (PDF, 151 KB)
• 2022 Summer Seasonal Final Report (PDF, 150 KB)

Year-End Emissions Reports

• 2023 Annual Emissions Report (PDF, 88 KB)
• 2022 Annual Emissions Report (PDF, 85 KB)

Source Test Reports

• 2024 Emissions Source Test Report (PDF, 15 MB)

Greeley Sites

• Q2 2025 TSP and PM10 Monitoring Report (PDF, 7.0 MB)
• Q1 2025 TSP and PM10 Monitoring Report (PDF, 8.3 MB)
• Q4 2024 TSP and PM10 Monitoring Report (PDF, 8.6 MB)
• Q3 2024 TSP and PM10 Monitoring Report (PDF, 8.2 MB)
• Q2 2024 TSP and PM10 Monitoring Report (PDF, 6.8 MB)
• Q1 2024 TSP and PM10 Monitoring Report (PDF, 4.9 MB)
• Q4 2023 TSP and PM10 Monitoring Report (PDF, 4.5 MB)
• Q3 2023 TSP and PM10 Monitoring Report (PDF, 6.9 MB)
• Q2 2023 TSP and PM10 Monitoring Report (PDF, 4.9 MB)
• Q1 2023 TSP and PM10 Monitoring Report (PDF, 4.7 MB)

Supplemental Sites

• Q2 2025 TSP and Dustfall Monitoring Report (PDF, 8.4 MB)
• Q1 2025 TSP and Dustfall Monitoring Report (PDF, 8.9 MB)
• Q4 2024 TSP and Dustfall Monitoring Report (PDF, 6.2 MB)
• Q3 2024 TSP and Dustfall Monitoring Report (PDF, 8.7 MB)
• Q2 2024 TSP and Dustfall Monitoring Report (PDF, 4.2 MB)
• Q1 2024 TSP and Dustfall Monitoring Report (PDF, 4.2 MB)
• Q4 2023 TSP and Dustfall Monitoring Report (PDF, 4.5 MB)
• Q3 2023 TSP and Dustfall Monitoring Report (PDF, 3.9 MB)

• Underground Storage Tank Operating Permit 47-13549 (PDF, 399 KB)
• Multi-Sector General Permit for Stormwater Discharges Associated with Industrial Activity (PDF, 7 MB)