# Relationship history for MSHA mine 4606197

Current hierarchy: **John Mitch Potter → Coal-Mac LLC → #12 Pine Creek Preparation Plant/Impound**

- 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

- **controller_controls_mine:** Ashland Inc et al → #12 Pine Creek Preparation Plant/Impound; 1977-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hobet Mining Inc → #12 Pine Creek Preparation Plant/Impound; 1980-07-01 to 2006-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Hobet Mining Inc; 1980-07-01 to 2006-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → #12 Pine Creek Preparation Plant/Impound; 1989-10-19 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → #12 Pine Creek Preparation Plant/Impound; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Coal-Mac LLC → #12 Pine Creek Preparation Plant/Impound; 2006-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Coal-Mac LLC; 2006-02-15 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Coal-Mac LLC; 2006-02-15 to 2019-10-22; source msha-controller-operator-history
- **controller_controls_mine:** John Mitch Potter → #12 Pine Creek Preparation Plant/Impound; 2019-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Mitch Potter → Coal-Mac LLC; 2019-10-23 to current/open; source msha-controller-operator-history