# Relationship history for MSHA mine 4602435

Current hierarchy: **John Mitch Potter → Coal-Mac LLC → Holden #25 Slurry Impoundment**

- 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:** Occidental Petroleum Corp → Holden #25 Slurry Impoundment; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Mining Company → Holden #25 Slurry Impoundment; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Nippon Kokan K K et al → Holden #25 Slurry Impoundment; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nippon Kokan K K et al → National Coal Mining Company; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → Holden #25 Slurry Impoundment; 1979-05-01 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1979-05-01 to 1981-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Agipcoal Usa Inc → Holden #25 Slurry Impoundment; 1982-01-01 to 1991-06-19; source msha-controller-operator-history
- **controller_controls_mine:** ENI → Holden #25 Slurry Impoundment; 1982-01-01 to 1994-01-31; source msha-controller-operator-history
- **controller_controls_operator:** ENI → Agipcoal Usa Inc; 1982-01-01 to 1991-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Holden #25 Slurry Impoundment; 1989-10-19 to 1997-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Celtic Processing Company Inc → Holden #25 Slurry Impoundment; 1991-06-20 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Michael E  Lyons → Holden #25 Slurry Impoundment; 1991-06-20 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael E  Lyons → Celtic Processing Company Inc; 1991-06-20 to 1997-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Coal-Mac LLC → Holden #25 Slurry Impoundment; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Coal-Mac LLC; 1997-07-01 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Holden #25 Slurry Impoundment; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Coal-Mac LLC; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **controller_controls_mine:** John Mitch Potter → Holden #25 Slurry Impoundment; 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