# Relationship history for MSHA mine 2103098

Current hierarchy: **Carmeuse Holding SA → Superior Minerals Company → SHAKOPEE PLANT**

- 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:** Superior Minerals Company → SHAKOPEE PLANT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T C Mineral (aka Twin City Mineral) → SHAKOPEE PLANT; 1995-05-01 to 2021-08-14; source msha-controller-operator-history
- **controller_controls_operator:** T C Mineral (aka Twin City Mineral) → Superior Minerals Company; 1995-05-01 to 2021-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → SHAKOPEE PLANT; 2021-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Superior Minerals Company; 2021-08-15 to current/open; source msha-controller-operator-history