# Relationship history for MSHA mine 4406849

Current hierarchy: **Massey Energy Company → Fork Ridge Coal Corp → 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:** Fork Ridge Coal Corp → Mine No 1; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Corporation → Mine No 1; 1996-09-01 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Corporation → Fork Ridge Coal Corp; 1996-09-01 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 1; 2010-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Fork Ridge Coal Corp; 2010-04-19 to current/open; source msha-controller-operator-history