# Relationship history for MSHA mine 1507232

Current hierarchy: **El Paso Energy Corp → Coastal Coal Company, L.L.C. → Koyle Branch Mine # 1**

- 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:** Partin Coal Sales Inc → Koyle Branch Mine # 1; 1974-07-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Herbert L  Partin → Koyle Branch Mine # 1; 1974-07-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Herbert L  Partin → Partin Coal Sales Inc; 1974-07-01 to 1981-08-25; source msha-controller-operator-history
- **operator_operates_mine:** B & C Coal Company → Koyle Branch Mine # 1; 1981-08-26 to 1982-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Larry F  Bentley et al → Koyle Branch Mine # 1; 1981-08-26 to 1982-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Larry F  Bentley et al → B & C Coal Company; 1981-08-26 to 1982-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Koyle Branch Coal → Koyle Branch Mine # 1; 1982-10-29 to 1983-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Waltis  Kilburn Jr → Koyle Branch Mine # 1; 1982-10-29 to 1983-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Waltis  Kilburn Jr → Koyle Branch Coal; 1982-10-29 to 1983-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Koyle Branch Coal Company Inc → Koyle Branch Mine # 1; 1983-04-15 to 1984-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Rodney L  Partin et al → Koyle Branch Mine # 1; 1983-04-15 to 1992-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Rodney L  Partin et al → Koyle Branch Coal Company Inc; 1983-04-15 to 1984-08-27; source msha-controller-operator-history
- **operator_operates_mine:** White Star Mining Inc → Koyle Branch Mine # 1; 1984-08-28 to 1985-10-24; source msha-controller-operator-history
- **controller_controls_mine:** James  Trosper → Koyle Branch Mine # 1; 1984-08-28 to 1985-10-24; source msha-controller-operator-history
- **controller_controls_operator:** James  Trosper → White Star Mining Inc; 1984-08-28 to 1985-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Koyle Branch Coal Company Inc → Koyle Branch Mine # 1; 1985-10-25 to 1992-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Rodney L  Partin et al → Koyle Branch Coal Company Inc; 1985-10-25 to 1992-12-10; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Koyle Branch Mine # 1; 1989-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Iva Coal Inc → Koyle Branch Mine # 1; 1992-12-11 to 2000-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Gary T  Rutherford → Koyle Branch Mine # 1; 1992-12-11 to 2000-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Gary T  Rutherford → Iva Coal Inc; 1992-12-11 to 2000-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal Company, L.L.C. → Koyle Branch Mine # 1; 2000-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal Company, L.L.C.; 2000-08-24 to current/open; source msha-controller-operator-history