# Relationship history for MSHA mine 4608505

Current hierarchy: **El Paso Energy Corp → Coastal Coal-West Virginia Llc → South Fork No 2 Deep (1)**

- 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:** El Paso Energy Corp → South Fork No 2 Deep (1); 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → South Fork No 2 Deep (1); 1991-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → South Fork No 2 Deep (1); 1993-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Greenbrier Coal Company → South Fork No 2 Deep (1); 1995-06-01 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Greenbrier Coal Company; 1995-06-01 to 1995-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Cow Creek Coal Company Inc → South Fork No 2 Deep (1); 1995-09-12 to 1997-12-29; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → Cow Creek Coal Company Inc; 1995-09-12 to 1997-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal-West Virginia Llc → South Fork No 2 Deep (1); 1997-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal-West Virginia Llc; 1997-12-30 to current/open; source msha-controller-operator-history