# Relationship history for MSHA mine 1512087

Current hierarchy: **James River Coal Company → Bledsoe Coal Corp → Robins Branch Impoundment**

- 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:** Kaneb Services Inc → Robins Branch Impoundment; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Clay Inc → Robins Branch Impoundment; 1979-09-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Mountain Clay Inc; 1979-09-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Williams Companies Inc → Robins Branch Impoundment; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Clay Inc → Robins Branch Impoundment; 1988-03-23 to 1995-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Williams Companies Inc → Mountain Clay Inc; 1988-03-23 to 1995-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Bledsoe Coal Corp → Robins Branch Impoundment; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → Robins Branch Impoundment; 1995-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Bledsoe Coal Corp; 1995-06-20 to current/open; source msha-controller-operator-history