# Relationship history for MSHA mine 2401975

Current hierarchy: **Burlington Resources → Meridian Minerals Company → Bull Mountains 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Burlington Resources → Bull Mountains Mine No 1; 1989-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Minerals Company → Bull Mountains Mine No 1; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources → Meridian Minerals Company; 1992-07-01 to current/open; source msha-controller-operator-history