# Relationship history for MSHA mine 1001574

Current hierarchy: **Meridian Gold Inc → Meridian Beartrack Company → Beartrack Mine**

- 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

- **operator_operates_mine:** Leesburg Land & Mining Inc → Beartrack Mine; 1982-06-01 to 1994-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Leesburg Land & Mining Inc → Beartrack Mine; 1982-06-01 to 1994-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Leesburg Land & Mining Inc → Leesburg Land & Mining Inc; 1982-06-01 to 1994-05-07; source msha-controller-operator-history
- **controller_controls_mine:** FMC Corp → Beartrack Mine; 1990-05-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Gold Company → Beartrack Mine; 1994-05-08 to 1996-07-31; source msha-controller-operator-history
- **controller_controls_operator:** FMC Corp → Meridian Gold Company; 1994-05-08 to 1996-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Beartrack Company → Beartrack Mine; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Gold Inc → Beartrack Mine; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Gold Inc → Meridian Beartrack Company; 1996-08-01 to current/open; source msha-controller-operator-history