# Relationship history for MSHA mine 1511528

Current hierarchy: **J Mark  Campbell → Premier Elkhorn Coal Company → Premier Elkhorn Loadout #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Bav Liquidating Corp → Premier Elkhorn Loadout #2; 1950-01-01 to 1979-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Iron Coal & Coke Company → Premier Elkhorn Loadout #2; 1978-09-01 to 1979-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Bav Liquidating Corp → Virginia Iron Coal & Coke Company; 1978-09-01 to 1979-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Enterprise Coal Company → Premier Elkhorn Loadout #2; 1979-06-29 to 1997-03-10; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Premier Elkhorn Loadout #2; 1979-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Enterprise Coal Company; 1979-06-29 to 1997-03-10; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → Premier Elkhorn Loadout #2; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal Company → Premier Elkhorn Loadout #2; 1997-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal Company; 1997-03-11 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Premier Elkhorn Loadout #2; 2015-09-21 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → Premier Elkhorn Coal Company; 2015-09-21 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → Premier Elkhorn Loadout #2; 2019-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → Premier Elkhorn Coal Company; 2019-06-16 to current/open; source msha-controller-operator-history