# Relationship history for MSHA mine 2400157

Current hierarchy: **Riverspan Partners LP → ELEVATION NEWCO LLC → Barretts Mill**

- 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:** Barretts Minerals Inc → Barretts Mill; 1950-01-01 to 2025-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Minerals Technologies Inc → Barretts Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minerals Technologies Inc → Barretts Minerals Inc; 1950-01-01 to 2025-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Riverspan Partners LP → Barretts Mill; 2024-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ELEVATION NEWCO LLC → Barretts Mill; 2025-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverspan Partners LP → ELEVATION NEWCO LLC; 2025-01-28 to current/open; source msha-controller-operator-history