# Relationship history for MSHA mine 3606613

Current hierarchy: **Donald A  Soberdash → Black Mountain Mining Company → Black Mt Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Marmon Group Inc → Black Mt Mine; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Penn Pocahontas Coal Company → Black Mt Mine; 1978-03-01 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Marmon Group Inc → Penn Pocahontas Coal Company; 1978-03-01 to 1986-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Mining Company → Black Mt Mine; 1986-04-15 to 1986-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Donald A  Soberdash → Black Mt Mine; 1986-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald A  Soberdash → Black Mountain Mining Company; 1986-04-15 to 1986-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Mining Inc → Black Mt Mine; 1986-08-13 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Keslar Robert S → Black Mt Mine; 1986-08-13 to 1987-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Keslar Robert S → Black Mountain Mining Inc; 1986-08-13 to 1987-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Pierpont Mining Inc → Black Mt Mine; 1987-01-06 to 1987-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Forman Loyal Jr & Robert Lose → Black Mt Mine; 1987-01-06 to 1987-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Forman Loyal Jr & Robert Lose → Pierpont Mining Inc; 1987-01-06 to 1987-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Top Grade Fuels Inc → Black Mt Mine; 1987-02-02 to 1996-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Donald A  Soberdash → Black Mt Mine; 1987-02-02 to 1996-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Donald A  Soberdash → Top Grade Fuels Inc; 1987-02-02 to 1996-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Fox Mining Company Inc → Black Mt Mine; 1996-01-16 to 1996-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Alvin E  Naugle Jr → Black Mt Mine; 1996-01-16 to 1996-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Alvin E  Naugle Jr → Fox Mining Company Inc; 1996-01-16 to 1996-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Fox Mining Company Inc → Black Mt Mine; 1996-08-13 to 1998-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Timothy R  Mowry → Black Mt Mine; 1996-08-13 to 1998-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Timothy R  Mowry → Fox Mining Company Inc; 1996-08-13 to 1998-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Mining Company → Black Mt Mine; 1998-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald A  Soberdash → Black Mountain Mining Company; 1998-05-05 to current/open; source msha-controller-operator-history