# Relationship history for MSHA mine 4002317

Current hierarchy: **Walt John Fred Iii → Big Valley Minerals Corp → No 1 Mine**

- 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:** Layne Willard → No 1 Mine; 1977-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Layne Coal Company → No 1 Mine; 1977-09-01 to 1980-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Layne Willard → Layne Coal Company; 1977-09-01 to 1980-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Layne Willard--Frank Roark & John P Malpert → No 1 Mine; 1979-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New River Coals Ltd → No 1 Mine; 1980-04-10 to 1982-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Layne Willard--Frank Roark & John P Malpert → New River Coals Ltd; 1980-04-10 to 1982-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Al-Ran Mining Company Inc → No 1 Mine; 1982-07-05 to 1984-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Albert E → No 1 Mine; 1982-07-05 to 1984-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Albert E → Al-Ran Mining Company Inc; 1982-07-05 to 1984-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Big Valley Minerals Corp → No 1 Mine; 1984-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walt John Fred Iii → No 1 Mine; 1984-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt John Fred Iii → Big Valley Minerals Corp; 1984-10-09 to current/open; source msha-controller-operator-history