# Relationship history for MSHA mine 1515592

Current hierarchy: **Barnwell Darrell G → Alpha Mining Company → Mine No 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:** Lynn Camp Mining Inc → Mine No 1; 1986-04-01 to 1988-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Smith Larry A → Mine No 1; 1986-04-01 to 1988-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Smith Larry A → Lynn Camp Mining Inc; 1986-04-01 to 1988-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Dns Coal Company Inc → Mine No 1; 1988-10-03 to 1989-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Hoskins Numan → Mine No 1; 1988-10-03 to 1990-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Hoskins Numan → Dns Coal Company Inc; 1988-10-03 to 1989-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Alpha Mining Company → Mine No 1; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnwell Darrell G → Mine No 1; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnwell Darrell G → Alpha Mining Company; 1989-05-30 to current/open; source msha-controller-operator-history