# Relationship history for MSHA mine 4605629

Current hierarchy: **James M  Claassen; David M  Guidebeck → Treasure Coast Coal, LLC → Boyd No 2 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hawley Charbon → Boyd No 2 Mine; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boyd Mary J → Boyd No 2 Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boyd Coal Company → Boyd No 2 Mine; 1977-09-01 to 1980-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Mary J → Boyd Coal Company; 1977-09-01 to 1980-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Hawley Coal Mining Corp → Boyd No 2 Mine; 1980-07-25 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → Hawley Coal Mining Corp; 1980-07-25 to 1985-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Boyd No 2 Mine; 1985-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Development Company → Boyd No 2 Mine; 1985-09-07 to 1987-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Alpine Development Company; 1985-09-07 to 1987-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Rock Mining Inc → Boyd No 2 Mine; 1987-06-01 to 1990-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Kennedy Edna → Boyd No 2 Mine; 1987-06-01 to 1990-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Kennedy Edna → Eagle Rock Mining Inc; 1987-06-01 to 1990-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Ace Mining Inc → Boyd No 2 Mine; 1990-10-27 to 1994-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Steele Ronnie Et Al → Boyd No 2 Mine; 1990-10-27 to 1994-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Steele Ronnie Et Al → Ace Mining Inc; 1990-10-27 to 1994-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Avondale Coal Sales Inc → Boyd No 2 Mine; 1994-04-20 to 1997-05-21; source msha-controller-operator-history
- **controller_controls_mine:** David  Hopkins → Boyd No 2 Mine; 1994-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Hopkins → Avondale Coal Sales Inc; 1994-04-20 to 1997-05-21; source msha-controller-operator-history
- **controller_controls_mine:** American Metals & Coal International Inc → Boyd No 2 Mine; 1996-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Energy Inc → Boyd No 2 Mine; 1997-05-22 to 1998-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Woolridge J C → Boyd No 2 Mine; 1997-05-22 to 1998-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Woolridge J C → Black Energy Inc; 1997-05-22 to 1998-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Development Company → Boyd No 2 Mine; 1998-10-13 to 2006-01-03; source msha-controller-operator-history
- **controller_controls_operator:** American Metals & Coal International Inc → Alpine Development Company; 1998-10-13 to 2006-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Treasure Coast Coal, LLC → Boyd No 2 Mine; 2006-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Guidebeck et al → Boyd No 2 Mine; 2006-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Guidebeck et al → Treasure Coast Coal, LLC; 2006-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M  Claassen et al → Treasure Coast Coal, LLC; 2006-01-04 to current/open; source msha-controller-operator-history