# Relationship history for MSHA mine 1516750

Current hierarchy: **Joby  Fields → Black Diamond Coal Corp → Mine No 2**

- 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

- **operator_operates_mine:** Burning Ridge Coal Company Inc → Mine No 2; 1989-10-01 to 1993-03-25; source msha-controller-operator-history
- **controller_controls_mine:** John F  Stapleton → Mine No 2; 1989-10-01 to 1993-03-25; source msha-controller-operator-history
- **controller_controls_operator:** John F  Stapleton → Burning Ridge Coal Company Inc; 1989-10-01 to 1993-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Joby  Fields → Mine No 2; 1993-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Ridge Mining Company → Mine No 2; 1993-03-26 to 1993-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 2; 1993-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → New Ridge Mining Company; 1993-03-26 to 1993-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Coal Corp → Mine No 2; 1993-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joby  Fields → Black Diamond Coal Corp; 1993-05-04 to current/open; source msha-controller-operator-history