# Relationship history for MSHA mine 1001686

Current hierarchy: **Donald Dearing → D & D Mining → Relief Creek Project**

- 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

- **controller_controls_mine:** Donald Dearing Et Al → Relief Creek Project; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & D Mining → Relief Creek Project; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald Dearing Et Al → D & D Mining; 1985-07-01 to current/open; source msha-controller-operator-history