# Relationship history for MSHA mine 4800889

Current hierarchy: **Halliburton Company → Bentonite Performance Minerals LLC → BPM Colony 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:** Baroid Drilling Fluids Inc → BPM Colony Mine; 1950-01-01 to 1991-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Nl Industries Inc → BPM Colony Mine; 1950-01-01 to 1996-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Nl Industries Inc → Baroid Drilling Fluids Inc; 1950-01-01 to 1991-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Tremont → BPM Colony Mine; 1991-11-18 to 1994-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Bentonite Corp → BPM Colony Mine; 1991-11-19 to 1994-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Tremont → Bentonite Corp; 1991-11-19 to 1994-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Bentonite Corp → BPM Colony Mine; 1994-01-21 to 1998-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Dresser Industries Inc → BPM Colony Mine; 1994-01-21 to 1998-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Dresser Industries Inc → Bentonite Corp; 1994-01-21 to 1998-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Bentonite Performance Minerals → BPM Colony Mine; 1998-02-26 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Halliburton Company → BPM Colony Mine; 1998-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Bentonite Performance Minerals; 1998-02-26 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Halliburton Energy Services → BPM Colony Mine; 2004-01-01 to 2006-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Halliburton Energy Services; 2004-01-01 to 2006-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Bentonite Performance Minerals LLC → BPM Colony Mine; 2006-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Bentonite Performance Minerals LLC; 2006-06-01 to current/open; source msha-controller-operator-history