# Relationship history for MSHA mine 4105600

Current hierarchy: **GCC SAB de CV → NM Energy LLC → Grandfalls Pit**

- 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

- **controller_controls_mine:** Bobby  Robertson → Grandfalls Pit; 2018-03-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hunter Logistics LLC → Grandfalls Pit; 2022-01-02 to 2026-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Robertson → Hunter Logistics LLC; 2022-01-02 to 2026-07-13; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → Grandfalls Pit; 2024-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** NM Energy LLC → Grandfalls Pit; 2026-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → NM Energy LLC; 2026-07-14 to current/open; source msha-controller-operator-history