# Relationship history for MSHA mine 3304062

Current hierarchy: **St Clair Leon → Columbiana Mining Company → Columbiana #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:** M J Mining Company → Columbiana #1; 1986-07-01 to 1986-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Rouse Richard → Columbiana #1; 1986-07-01 to 1986-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Rouse Richard → M J Mining Company; 1986-07-01 to 1986-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Salem Mining Company Inc → Columbiana #1; 1986-09-08 to 1987-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ersel → Columbiana #1; 1986-09-08 to 1987-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ersel → Salem Mining Company Inc; 1986-09-08 to 1987-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Columbiana Mining Company Inc → Columbiana #1; 1987-04-27 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Robert → Columbiana #1; 1987-04-27 to 1987-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Robert → Columbiana Mining Company Inc; 1987-04-27 to 1987-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Columbiana Mining Company → Columbiana #1; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** St Clair Leon → Columbiana #1; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Clair Leon → Columbiana Mining Company; 1987-08-01 to current/open; source msha-controller-operator-history