# Relationship history for MSHA mine 4608613

Current hierarchy: **Alpha Natural Resources, Inc. → Simmons Fork Mining Incorporated → Simmons Fork Surface 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:** Simmons Fork Mining Incorporated → Simmons Fork Surface Mine; 1996-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → Simmons Fork Surface Mine; 1996-11-01 to 2006-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Simmons Fork Mining Incorporated; 1996-11-01 to 2006-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Foundation Coal Corporation → Simmons Fork Surface Mine; 2006-04-28 to 2009-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Foundation Coal Corporation → Simmons Fork Mining Incorporated; 2006-04-28 to 2009-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Simmons Fork Surface Mine; 2009-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Simmons Fork Mining Incorporated; 2009-07-31 to current/open; source msha-controller-operator-history