# Relationship history for MSHA mine 5001883

Current hierarchy: **Orion Marine Group Inc → Orion Marine Contractors → Cape Lisburne**

- 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:** Bradley K  West → Cape Lisburne; 2003-04-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Construction Company → Cape Lisburne; 2008-06-09 to 2016-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Bradley K  West → West Construction Company; 2008-06-09 to 2016-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Orion Marine Group Inc → Cape Lisburne; 2014-10-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Orion Marine Contractors → Cape Lisburne; 2016-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orion Marine Group Inc → Orion Marine Contractors; 2016-07-08 to current/open; source msha-controller-operator-history