# Relationship history for MSHA mine 4405884

Current hierarchy: **Hicks Robert A → Big Dog Coal Company Inc → Big Dog Coal Co #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:** Cumberland Resources Corporation → Big Dog Coal Co #2; 1979-01-16 to 1982-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Yale Mining Corp → Big Dog Coal Co #2; 1982-05-01 to 1982-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Corporation → Yale Mining Corp; 1982-05-01 to 1982-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Yale Mining Corp → Big Dog Coal Co #2; 1982-09-14 to 1982-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Americoal Corp & Associates Of Va Ltd → Big Dog Coal Co #2; 1982-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Americoal Corp & Associates Of Va Ltd → Yale Mining Corp; 1982-09-14 to 1982-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Kanal Coal Corp → Big Dog Coal Co #2; 1982-12-07 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Michael R → Big Dog Coal Co #2; 1982-12-07 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Michael R → Kanal Coal Corp; 1982-12-07 to 1986-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Cox Creek Kanal Coal Company → Big Dog Coal Co #2; 1986-02-18 to 1989-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Belcher → Big Dog Coal Co #2; 1986-02-18 to 1989-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Belcher → Cox Creek Kanal Coal Company; 1986-02-18 to 1989-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Har-Lee Coal Company Inc → Big Dog Coal Co #2; 1989-02-21 to 1990-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Theodore  Yates et al → Big Dog Coal Co #2; 1989-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore  Yates et al → Har-Lee Coal Company Inc; 1989-02-21 to 1990-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Hicks Robert A → Big Dog Coal Co #2; 1990-12-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Dog Coal Company Inc → Big Dog Coal Co #2; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hicks Robert A → Big Dog Coal Company Inc; 1991-01-01 to current/open; source msha-controller-operator-history