# Relationship history for MSHA mine 1505325

Current hierarchy: **Cyprus Amax Minerals Company → Lost Mountain Mining Company → #2 Surface 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** James A  Sigmon → #2 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Newcon Coals Inc → #2 Surface Mine; 1971-01-01 to 1979-10-04; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Newcon Coals Inc; 1971-01-01 to 1979-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Coals Inc → #2 Surface Mine; 1979-10-01 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Lost Mountain Mining Inc → #2 Surface Mine; 1979-10-05 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Lost Mountain Mining Inc; 1979-10-05 to 1981-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Lost Mountain Mining Company → #2 Surface Mine; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → #2 Surface Mine; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Lost Mountain Mining Company; 1981-09-01 to current/open; source msha-controller-operator-history