# Relationship history for MSHA mine 4402708

Current hierarchy: **Metinvest B V → Black Diamond Company → #1 Loading Dock**

- 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:** Black Diamond Fuel Company → #1 Loading Dock; 1950-01-01 to 1975-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Fields Resources Inc → #1 Loading Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Black Diamond Fuel Company; 1950-01-01 to 1975-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Excello Coal Corp → #1 Loading Dock; 1975-08-13 to 1979-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Excello Coal Corp → #1 Loading Dock; 1975-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Excello Coal Corp → Excello Coal Corp; 1975-08-13 to 1979-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Black Watch/Black Diamond Coal Corp → #1 Loading Dock; 1979-09-25 to 1980-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Black Watch/Black Diamond Coal Corp; 1979-09-25 to 1980-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Energy Company → #1 Loading Dock; 1980-06-26 to 1984-09-26; source msha-controller-operator-history
- **controller_controls_mine:** W R Grace Company et al → #1 Loading Dock; 1980-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W R Grace Company et al → Rapoca Energy Company; 1980-06-26 to 1984-09-26; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company et al → Rapoca Energy Company; 1980-06-26 to 1984-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Spirit Coal Corp → #1 Loading Dock; 1984-09-27 to 1985-11-26; source msha-controller-operator-history
- **controller_controls_mine:** David  Powers → #1 Loading Dock; 1984-09-27 to 1985-11-26; source msha-controller-operator-history
- **controller_controls_operator:** David  Powers → Spirit Coal Corp; 1984-09-27 to 1985-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Company → #1 Loading Dock; 1985-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → #1 Loading Dock; 1985-11-27 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Black Diamond Company; 1985-11-27 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → #1 Loading Dock; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Black Diamond Company; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → #1 Loading Dock; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Black Diamond Company; 2009-04-30 to current/open; source msha-controller-operator-history