# Relationship history for MSHA mine 1507461

Current hierarchy: **John  Harris → Bull Creek Coal Corporation → Bull Creek Plant**

- 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:** Blackburn Wesley → Bull Creek Plant; 1974-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackhawk Mining Company Inc → Bull Creek Plant; 1974-10-01 to 1984-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Wesley → Blackhawk Mining Company Inc; 1974-10-01 to 1984-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Blackhawk Mining Company Inc → Bull Creek Plant; 1984-04-19 to 1988-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Quintana Minerals Corp → Bull Creek Plant; 1984-04-19 to 1988-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Quintana Minerals Corp → Blackhawk Mining Company Inc; 1984-04-19 to 1988-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Bull Creek Processing Inc → Bull Creek Plant; 1988-06-23 to 1992-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Bull Creek Plant; 1988-06-23 to 1992-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Bull Creek Processing Inc; 1988-06-23 to 1992-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Bull Creek Coal Corporation → Bull Creek Plant; 1992-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Harris → Bull Creek Plant; 1992-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Harris → Bull Creek Coal Corporation; 1992-10-28 to current/open; source msha-controller-operator-history