# Relationship history for MSHA mine 0500256

Current hierarchy: **Energy Capital Development Corp → Black Rock Mining Company Inc → Sunlight**

- 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:** Four Mile Coal Company Inc → Sunlight; 1950-01-01 to 1976-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Betz C A → Sunlight; 1950-01-01 to 1979-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Betz C A → Four Mile Coal Company Inc; 1950-01-01 to 1976-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Carbon King Ltd → Sunlight; 1976-11-15 to 1978-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Matthews Joe B → Sunlight; 1976-11-15 to 1978-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Matthews Joe B → Carbon King Ltd; 1976-11-15 to 1978-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Four Mile Coal Company Inc → Sunlight; 1978-11-10 to 1979-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Betz C A → Four Mile Coal Company Inc; 1978-11-10 to 1979-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Bessinger & Bessinger Inc → Sunlight; 1979-07-13 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Bessinger B L → Sunlight; 1979-07-13 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Bessinger B L → Bessinger & Bessinger Inc; 1979-07-13 to 1980-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Black Rock Mining Company → Sunlight; 1980-07-30 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Bachmann J R → Sunlight; 1980-07-30 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Bachmann J R → Black Rock Mining Company; 1980-07-30 to 1981-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Black Rock Mining Company Inc → Sunlight; 1981-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Energy Capital Development Corp → Sunlight; 1981-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Capital Development Corp → Black Rock Mining Company Inc; 1981-05-11 to current/open; source msha-controller-operator-history