# Relationship history for MSHA mine 5500005

Current hierarchy: **Alcoa Inc; Western Mining Corp Holdings Ltd → St. Croix Alumina, LLC → St. Croix Alumina, LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Martin Marietta Alumina → St. Croix Alumina, LLC; 1950-01-01 to 1989-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → St. Croix Alumina, LLC; 1950-01-01 to 1989-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Alumina; 1950-01-01 to 1989-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Virgin Islands Alumina Corp → St. Croix Alumina, LLC; 1989-07-13 to 1995-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Clarendon → St. Croix Alumina, LLC; 1989-07-13 to 1995-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Clarendon → Virgin Islands Alumina Corp; 1989-07-13 to 1995-07-24; source msha-controller-operator-history
- **operator_operates_mine:** St. Croix Alumina, LLC → St. Croix Alumina, LLC; 1995-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alcoa Inc  et al → St. Croix Alumina, LLC; 1995-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alcoa Inc  et al → St. Croix Alumina, LLC; 1995-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Western Mining Corp Holdings Ltd  et al → St. Croix Alumina, LLC; 1995-07-25 to current/open; source msha-controller-operator-history