# Relationship history for MSHA mine 2401401

Current hierarchy: **Rice Robert A → Intermountain Mineral Engineers Inc → Basin Mill**

- 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:** Rice Robert A → Basin Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** National Minerals Corp → Basin Mill; 1950-01-01 to 1982-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Delaney Robert L → Basin Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delaney Robert L → National Minerals Corp; 1950-01-01 to 1982-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Inc → Basin Mill; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Billern Corp → Basin Mill; 1982-07-06 to 1983-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Espey William → Basin Mill; 1982-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Espey William → Billern Corp; 1982-07-06 to 1983-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Mining Corp → Basin Mill; 1983-10-26 to 1984-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Inc → Cumberland Mining Corp; 1983-10-26 to 1984-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Medallion Minerals Inc → Basin Mill; 1984-10-16 to 1989-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Medallion Minerals Inc → Basin Mill; 1984-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medallion Minerals Inc → Medallion Minerals Inc; 1984-10-16 to 1989-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Intermountain Mineral Engineers Inc → Basin Mill; 1989-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rice Robert A → Intermountain Mineral Engineers Inc; 1989-07-06 to current/open; source msha-controller-operator-history