# Relationship history for MSHA mine 0504184

Current hierarchy: **Horizon Natural Resources Incorporated → Bowie Resources Ltd → Bowie 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

- **controller_controls_mine:** Westmoreland Coal Company → Bowie No 1; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Westmoreland Inc → Bowie No 1; 1986-12-01 to 1988-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Colorado Westmoreland Inc; 1986-12-01 to 1988-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Orchard Valley Coal Corp → Bowie No 1; 1988-11-30 to 1995-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Bowie No 1; 1988-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Orchard Valley Coal Corp; 1988-11-30 to 1995-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Bowie Resources Ltd → Bowie No 1; 1995-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Bowie No 1; 1995-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Bowie Resources Ltd; 1995-02-16 to current/open; source msha-controller-operator-history