# Relationship history for MSHA mine 4607932

Current hierarchy: **Steve A  Rife → Black Rock Mining Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mountaineer Minerals & Extraction Inc → Mine No 1; 1990-09-01 to 1992-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Cline Colin → Mine No 1; 1990-09-01 to 1992-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Cline Colin → Mountaineer Minerals & Extraction Inc; 1990-09-01 to 1992-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Black Rock Minting Inc → Mine No 1; 1992-07-16 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Clarence → Mine No 1; 1992-07-16 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Clarence → Black Rock Minting Inc; 1992-07-16 to 1992-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Black Rock Mining Inc → Mine No 1; 1992-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve A  Rife → Mine No 1; 1992-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve A  Rife → Black Rock Mining Inc; 1992-10-26 to current/open; source msha-controller-operator-history