# Relationship history for MSHA mine 4105361

Current hierarchy: **J & S Materials → JARCO SANDS LLC → JARCO SANDS LLC**

- 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:** J W Sands LLC → JARCO SANDS LLC; 2018-05-01 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_mine:** James D Walker → JARCO SANDS LLC; 2018-05-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** James D Walker → J W Sands LLC; 2018-05-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mateo  Hernandez et al → JARCO SANDS LLC; 2023-01-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Mateo  Hernandez et al → J W Sands LLC; 2023-01-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Justin  Renfro et al → J W Sands LLC; 2023-01-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Mateo  Hernandez → JARCO SANDS LLC; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mateo  Hernandez → J W Sands LLC; 2023-06-01 to 2025-12-18; source msha-controller-operator-history
- **operator_operates_mine:** JARCO SANDS LLC → JARCO SANDS LLC; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J & S Materials → JARCO SANDS LLC; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J & S Materials → JARCO SANDS LLC; 2025-12-19 to current/open; source msha-controller-operator-history