# Relationship history for MSHA mine 4605649

Current hierarchy: **John Mitch Potter → Coal Mac, LLC → Delbarton Preparation Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Inverness Coal Company → Delbarton Preparation Plant; 1977-06-01 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Hart Robert C → Delbarton Preparation Plant; 1977-06-01 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Hart Robert C → Inverness Coal Company; 1977-06-01 to 1981-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Northland Resources Limited Liability Company → Delbarton Preparation Plant; 1981-08-11 to 1998-12-21; source msha-controller-operator-history
- **controller_controls_mine:** James O  Bunn  et al → Delbarton Preparation Plant; 1981-08-11 to 1998-12-21; source msha-controller-operator-history
- **controller_controls_operator:** James O  Bunn  et al → Northland Resources Limited Liability Company; 1981-08-11 to 1998-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Delbarton Preparation Plant; 1989-10-19 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Delbarton Preparation Plant; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Delbarton Mining Company, LLC → Delbarton Preparation Plant; 1998-12-22 to 2021-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Delbarton Preparation Plant; 1998-12-22 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Delbarton Mining Company, LLC; 1998-12-22 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Delbarton Preparation Plant; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Delbarton Mining Company, LLC; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Delbarton Preparation Plant; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Delbarton Mining Company, LLC; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Delbarton Preparation Plant; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Delbarton Mining Company, LLC; 2018-11-09 to 2021-11-15; source msha-controller-operator-history
- **controller_controls_mine:** John Mitch Potter → Delbarton Preparation Plant; 2019-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pocahontas Processing, LLC → Delbarton Preparation Plant; 2021-11-16 to 2025-06-11; source msha-controller-operator-history
- **controller_controls_mine:** John T  Quintrell → Delbarton Preparation Plant; 2021-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Quintrell → Pocahontas Processing, LLC; 2021-11-16 to 2025-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Coal Mac, LLC → Delbarton Preparation Plant; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Mitch Potter → Coal Mac, LLC; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Coal Mac, LLC; 2025-06-12 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Coal Mac, LLC; 2025-06-12 to 2019-10-22; source msha-controller-operator-history