# Relationship history for MSHA mine 1516627

Current hierarchy: **John Madison  Potter; David Nelson  Potter → Trinity Coal Corp Of Virginia → Darby #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James A  Sigmon → Darby #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jericol Mining Inc → Darby #2; 1989-05-01 to 1995-09-10; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Jericol Mining Inc; 1989-05-01 to 1995-09-10; source msha-controller-operator-history
- **controller_controls_mine:** O A  Stump Jr et al → Darby #2; 1993-10-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Energy Inc → Darby #2; 1995-09-11 to 1996-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Victor B  McKinney → Darby #2; 1995-09-11 to 1996-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Victor B  McKinney → Black Mountain Energy Inc; 1995-09-11 to 1996-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Arjay Mining Inc → Darby #2; 1996-01-24 to 1996-04-22; source msha-controller-operator-history
- **controller_controls_operator:** O A  Stump Jr et al → Arjay Mining Inc; 1996-01-24 to 1996-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Jericol Mining Inc → Darby #2; 1996-04-23 to 1997-04-13; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Jericol Mining Inc; 1996-04-23 to 1997-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Coal Corp Of Virginia → Darby #2; 1997-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John Madison  Potter et al → Darby #2; 1997-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Madison  Potter et al → Trinity Coal Corp Of Virginia; 1997-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David Nelson  Potter et al → Trinity Coal Corp Of Virginia; 1997-04-14 to current/open; source msha-controller-operator-history