# Relationship history for MSHA mine 3601889

Current hierarchy: **Gary  Lucas → Jackstone Coal Company → Buck Mountain Slope**

- 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:** Daubert & Knorr Coal Company → Buck Mountain Slope; 1950-01-01 to 1980-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Knorr Leroy Et Al → Buck Mountain Slope; 1950-01-01 to 1980-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Knorr Leroy Et Al → Daubert & Knorr Coal Company; 1950-01-01 to 1980-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Black Creek Coal Company Inc → Buck Mountain Slope; 1980-12-12 to 1984-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Lesher Robert & John Johnson → Buck Mountain Slope; 1980-12-12 to 1984-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Lesher Robert & John Johnson → Black Creek Coal Company Inc; 1980-12-12 to 1984-06-11; source msha-controller-operator-history
- **operator_operates_mine:** R & K Coal Company → Buck Mountain Slope; 1984-06-12 to 1987-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Lesher → Buck Mountain Slope; 1984-06-12 to 1987-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Lesher → R & K Coal Company; 1984-06-12 to 1987-11-17; source msha-controller-operator-history
- **operator_operates_mine:** R & K Coal Company Inc → Buck Mountain Slope; 1987-11-18 to 1996-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Jerry W  Lucas Jr → Buck Mountain Slope; 1987-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Lucas Jr → R & K Coal Company Inc; 1987-11-18 to 1996-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Jackstone Coal Company → Buck Mountain Slope; 1996-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Lucas et al → Buck Mountain Slope; 1996-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Lucas et al → Jackstone Coal Company; 1996-06-09 to current/open; source msha-controller-operator-history