# Relationship history for MSHA mine 1519145

Current hierarchy: **J Mark  Campbell → Premier Elkhorn Coal, LLC → Job #59 Pond Knob Surface**

- 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:** TECO Energy Inc → Job #59 Pond Knob Surface; 1991-12-02 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Job #59 Pond Knob Surface; 2000-08-11 to 2019-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Apex Energy Inc → Job #59 Pond Knob Surface; 2007-08-28 to 2017-10-04; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → Apex Energy Inc; 2007-08-28 to 2017-10-04; source msha-controller-operator-history
- **controller_controls_mine:** James H  Booth et al → Job #59 Pond Knob Surface; 2015-09-21 to 2019-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Premier Elkhorn Coal, LLC → Job #59 Pond Knob Surface; 2017-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Premier Elkhorn Coal, LLC; 2017-10-05 to 2015-09-20; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → Premier Elkhorn Coal, LLC; 2017-10-05 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → Job #59 Pond Knob Surface; 2019-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → Apex Energy Inc; 2019-06-16 to 2017-10-04; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → Premier Elkhorn Coal, LLC; 2019-06-16 to current/open; source msha-controller-operator-history