# Relationship history for MSHA mine 4406169

Current hierarchy: **Joe Douglas  Kilgore → Black Gold Development Corp Inc → Prep Plant #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

- **operator_operates_mine:** Russell Creek Coal Preparation Inc → Prep Plant #1; 1984-12-01 to 1992-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Slemp Joseph L & Gary Mitchell → Prep Plant #1; 1984-12-01 to 1992-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Slemp Joseph L & Gary Mitchell → Russell Creek Coal Preparation Inc; 1984-12-01 to 1992-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Black Gold Development Corp Inc → Prep Plant #1; 1992-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe Douglas  Kilgore → Prep Plant #1; 1992-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe Douglas  Kilgore → Black Gold Development Corp Inc; 1992-01-09 to current/open; source msha-controller-operator-history