# Relationship history for MSHA mine 0503718

Current hierarchy: **Backer Rushton O → Ncig Financial Inc → Coal Ridge #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

- **operator_operates_mine:** Storm King Mines Inc → Coal Ridge #1 Mine; 1981-08-01 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Gray Allen D → Coal Ridge #1 Mine; 1981-08-01 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gray Allen D → Storm King Mines Inc; 1981-08-01 to 1984-12-31; source msha-controller-operator-history
- **operator_operates_mine:** New Castle Energy Corp → Coal Ridge #1 Mine; 1985-01-01 to 1991-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Matthies E Peter → Coal Ridge #1 Mine; 1985-01-01 to 1991-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Matthies E Peter → New Castle Energy Corp; 1985-01-01 to 1991-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Ncig Financial Inc → Coal Ridge #1 Mine; 1991-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Backer Rushton O → Coal Ridge #1 Mine; 1991-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Backer Rushton O → Ncig Financial Inc; 1991-04-18 to current/open; source msha-controller-operator-history