# Relationship history for MSHA mine 4601297

Current hierarchy: **SMC Holding Corp → Mountain Laurel Resources Company → Siltix Ii**

- 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:** New River Company → Siltix Ii; 1950-01-01 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_mine:** CSX Corp → Siltix Ii; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CSX Corp → New River Company; 1950-01-01 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Mc Daniel Vernon → Siltix Ii; 1978-12-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mc Daniel Mining Company Inc → Siltix Ii; 1984-02-28 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Daniel Vernon → Mc Daniel Mining Company Inc; 1984-02-28 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Laurel Resources Company → Siltix Ii; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** SMC Holding Corp → Siltix Ii; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** SMC Holding Corp → Mountain Laurel Resources Company; 1987-01-01 to current/open; source msha-controller-operator-history