# Relationship history for MSHA mine 4801248

Current hierarchy: **James Cameron  Nairne → Green Bridge Holdings, Inc. → SYNTHETIC FUELS**

- 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:** Fort Union Mine Partnership → SYNTHETIC FUELS; 1979-05-01 to 1990-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Total Compagnie Francaise Des Petroles → SYNTHETIC FUELS; 1979-05-01 to 1990-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Total Compagnie Francaise Des Petroles → Fort Union Mine Partnership; 1979-05-01 to 1990-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Western Fuels Association Inc → SYNTHETIC FUELS; 1989-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fort Union Ltd → SYNTHETIC FUELS; 1990-04-24 to 1997-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Drummond Company Inc → SYNTHETIC FUELS; 1990-04-24 to 1997-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Drummond Company Inc → Fort Union Ltd; 1990-04-24 to 1997-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Coal Resources Company → SYNTHETIC FUELS; 1997-03-08 to 2004-09-23; source msha-controller-operator-history
- **controller_controls_mine:** RTZ-CRA Group → SYNTHETIC FUELS; 1997-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RTZ-CRA Group → Wyoming Coal Resources Company; 1997-03-08 to 2004-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Western Fuels-Wyoming, Inc → SYNTHETIC FUELS; 2004-09-24 to 2004-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Western Fuels Association Inc → Western Fuels-Wyoming, Inc; 2004-09-24 to 2004-11-03; source msha-controller-operator-history
- **operator_operates_mine:** KFX Plant, LLC → SYNTHETIC FUELS; 2004-11-04 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Energy Inc → SYNTHETIC FUELS; 2004-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Energy Inc → KFX Plant, LLC; 2004-11-04 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Evergreen Energy Inc → SYNTHETIC FUELS; 2005-04-01 to 2010-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Energy Inc → SYNTHETIC FUELS; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Energy Inc → Evergreen Energy Inc; 2005-04-01 to 2010-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Landrica Development Company → SYNTHETIC FUELS; 2010-04-16 to 2011-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Energy Inc → SYNTHETIC FUELS; 2010-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Energy Inc → Landrica Development Company; 2010-04-16 to 2011-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Green Bridge Holdings, Inc. → SYNTHETIC FUELS; 2011-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James Cameron  Nairne → SYNTHETIC FUELS; 2011-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Cameron  Nairne → Green Bridge Holdings, Inc.; 2011-04-19 to current/open; source msha-controller-operator-history