# Relationship history for MSHA mine 4801186

Current hierarchy: **Rag Aktiengesellschaft → RAG Shoshone Coal Corp → Shoshone No 1 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:** Carbon County Coal Company → Shoshone No 1 Mine; 1978-06-01 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Coal Company et al → Shoshone No 1 Mine; 1978-06-01 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Coal Company et al → Carbon County Coal Company; 1978-06-01 to 1987-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Shoshone Coal Corp → Shoshone No 1 Mine; 1987-09-01 to 1999-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Shoshone No 1 Mine; 1987-09-01 to 1999-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Shoshone Coal Corp; 1987-09-01 to 1999-06-29; source msha-controller-operator-history
- **operator_operates_mine:** RAG Shoshone Coal Corp → Shoshone No 1 Mine; 1999-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → Shoshone No 1 Mine; 1999-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → RAG Shoshone Coal Corp; 1999-06-30 to current/open; source msha-controller-operator-history