# Relationship history for MSHA mine 4104376

Current hierarchy: **Amrize South Central → Crockett County Mining Venture No.1 Ltd. → Midland Agg**

- 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:** Crockett County Mining, LTD → Midland Agg; 2002-07-11 to 2015-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Bates  et al → Midland Agg; 2002-07-11 to 2013-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Bates  et al → Crockett County Mining, LTD; 2002-07-11 to 2013-10-01; source msha-controller-operator-history
- **controller_controls_mine:** W L Ross & Co LLC et al → Midland Agg; 2013-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W L Ross & Co LLC et al → Crockett County Mining, LTD; 2013-10-02 to 2015-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Permian Basin Materials, LLC → Midland Agg; 2015-08-01 to 2026-02-17; source msha-controller-operator-history
- **controller_controls_mine:** W L Ross & Co LLC et al → Midland Agg; 2015-08-01 to 2026-02-17; source msha-controller-operator-history
- **controller_controls_operator:** W L Ross & Co LLC et al → Permian Basin Materials, LLC; 2015-08-01 to 2026-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Amrize South Central → Midland Agg; 2026-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize South Central → Permian Basin Materials, LLC; 2026-02-18 to 2026-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Crockett County Mining Venture No.1 Ltd. → Midland Agg; 2026-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize South Central → Crockett County Mining Venture No.1 Ltd.; 2026-02-18 to current/open; source msha-controller-operator-history