# Relationship history for MSHA mine 4202113

Current hierarchy: **Rag Aktiengesellschaft → Plateau Mining Corporation → Willow Creek 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

- **controller_controls_mine:** Cyprus Amax Minerals Company → Willow Creek Mine; 1985-09-03 to 1999-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Plateau Mining Corp → Willow Creek Mine; 1995-06-01 to 1999-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Plateau Mining Corp; 1995-06-01 to 1999-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → Willow Creek Mine; 1999-06-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plateau Mining Corp → Willow Creek Mine; 1999-06-30 to 2001-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Plateau Mining Corp; 1999-06-30 to 2001-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Amwest Exploration Company → Willow Creek Mine; 2001-08-01 to 2002-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Mueller Industries Inc → Willow Creek Mine; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mueller Industries Inc → Amwest Exploration Company; 2001-08-01 to 2002-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Plateau Mining Corporation → Willow Creek Mine; 2002-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Plateau Mining Corporation; 2002-02-14 to current/open; source msha-controller-operator-history