# Relationship history for MSHA mine 4801200

Current hierarchy: **Kiewit Peter Sons' Inc → Buckskin Mining Company → Buckskin 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Triton Coal Company → Buckskin Mine; 1978-11-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Shell Oil Company → Buckskin Mine; 1978-11-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Triton Coal Company; 1978-11-01 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Triton Coal Company → Buckskin Mine; 1992-11-24 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Buckskin Mine; 1992-11-24 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Triton Coal Company; 1992-11-24 to 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Triton Coal Company → Buckskin Mine; 1998-09-02 to 1998-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Buckskin Mine; 1998-09-02 to 1998-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Triton Coal Company; 1998-09-02 to 1998-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Triton Coal Company Llc → Buckskin Mine; 1998-12-14 to 2004-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Partners → Buckskin Mine; 1998-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Partners → Triton Coal Company Llc; 1998-12-14 to 2004-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Mining Group Inc. → Buckskin Mine; 2004-08-21 to 2015-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Peter Sons' Inc → Buckskin Mine; 2004-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Peter Sons' Inc → Kiewit Mining Group Inc.; 2004-08-21 to 2015-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Buckskin Mining Company → Buckskin Mine; 2015-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Peter Sons' Inc → Buckskin Mine; 2015-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Peter Sons' Inc → Buckskin Mining Company; 2015-05-04 to current/open; source msha-controller-operator-history