# Relationship history for MSHA mine 3303750

Current hierarchy: **Riggs Wayne H → Valley Mining, Inc. → Auger #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:** Richard L Poore Coal Company → Auger #1; 1979-05-01 to 1979-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Poore Richard L → Auger #1; 1979-05-01 to 1979-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Poore Richard L → Richard L Poore Coal Company; 1979-05-01 to 1979-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Genie Energy #1 Inc → Auger #1; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riggs Wayne H → Auger #1; 1979-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riggs Wayne H → Genie Energy #1 Inc; 1979-08-22 to current/open; source msha-controller-operator-history