# Relationship history for MSHA mine 1512536

Current hierarchy: **Darrell  Wagner → Four Aces Mining Inc → No 3**

- 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:** Goldfield Corp → No 3; 1975-03-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → No 3; 1980-10-01 to 1982-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Goldfield Corp → Harlan Fuel Company; 1980-10-01 to 1982-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → No 3; 1982-02-22 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Bow Valley Industries Ltd → No 3; 1982-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Harlan Fuel Company; 1982-02-22 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Wagner → No 3; 1986-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → No 3; 1987-02-04 to 1989-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → No 3; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Harlan Fuel Company; 1987-02-04 to 1989-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Four Aces Mining Inc → No 3; 1989-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Wagner → Four Aces Mining Inc; 1989-07-25 to current/open; source msha-controller-operator-history