# Relationship history for MSHA mine 4000798

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Southeast Agg Operations, LLC → Monterey Sand**

- 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:** Hoyt'S Sand Company → Monterey Sand; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Copley Jessie → Monterey Sand; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Copley Jessie → Hoyt'S Sand Company; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **operator_operates_mine:** American Sand Supply → Monterey Sand; 1984-07-19 to 1994-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Byrl F  Hill  et al → Monterey Sand; 1984-07-19 to 1994-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Byrl F  Hill  et al → American Sand Supply; 1984-07-19 to 1994-03-14; source msha-controller-operator-history
- **operator_operates_mine:** American Sand Supply → Monterey Sand; 1994-03-15 to 2008-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Lloyd M  Bowman  et al → Monterey Sand; 1994-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd M  Bowman  et al → American Sand Supply; 1994-03-15 to 2008-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Verle J  Bowman  et al → American Sand Supply; 1994-03-15 to 2008-08-10; source msha-controller-operator-history
- **operator_operates_mine:** American Sand Company LLC → Monterey Sand; 2008-08-11 to 2020-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Claiborne → Monterey Sand; 2008-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Claiborne → American Sand Company LLC; 2008-08-11 to 2020-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Blue Water Industries Holdings LLC → Monterey Sand; 2017-12-29 to 2024-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Blue Water Industries → Monterey Sand; 2020-08-09 to 2024-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Water Industries Holdings LLC → Blue Water Industries; 2020-08-09 to 2024-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Monterey Sand; 2024-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Blue Water Industries; 2024-04-29 to 2024-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Southeast Agg Operations, LLC → Monterey Sand; 2024-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Monterey Sand; 2024-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Southeast Agg Operations, LLC; 2024-12-12 to current/open; source msha-controller-operator-history