# Relationship history for MSHA mine 4105644

Current hierarchy: **John  Cross; Will  Glusac → ETP OP's, LLC → Explore Martin County Sand Plant**

- 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:** Explore Mining Company LLC → Explore Martin County Sand Plant; 2022-10-06 to 2023-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Explore Group LLC → Explore Martin County Sand Plant; 2022-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Explore Group LLC → Explore Mining Company LLC; 2022-10-06 to 2023-04-14; source msha-controller-operator-history
- **operator_operates_mine:** ETP OP's, LLC → Explore Martin County Sand Plant; 2023-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Cross et al → Explore Martin County Sand Plant; 2023-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Cross et al → ETP OP's, LLC; 2023-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Will  Glusac et al → ETP OP's, LLC; 2023-04-15 to current/open; source msha-controller-operator-history