# Relationship history for MSHA mine 1501394

Current hierarchy: **Cyprus Amax Minerals Company → Lost Mountain Mining Company → No1**

- 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:** Tarheel Coals Inc → No1; 1950-01-01 to 1979-10-11; source msha-controller-operator-history
- **controller_controls_mine:** James A  Sigmon → No1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Tarheel Coals Inc; 1950-01-01 to 1979-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Coals Inc → No1; 1979-10-01 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Lost Mountain Mining Inc → No1; 1979-10-12 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Lost Mountain Mining Inc; 1979-10-12 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → No1; 1981-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lost Mountain Mining Company → No1; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Lost Mountain Mining Company; 1981-09-15 to current/open; source msha-controller-operator-history