# Relationship history for MSHA mine 2901667

Current hierarchy: **Vulcan Materials Company → Cal Mat Co → Baca 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

- **operator_operates_mine:** Frank Moser Contractor → Baca Pit; 1950-01-01 to 1983-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Moser → Baca Pit; 1950-01-01 to 1983-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Moser → Frank Moser Contractor; 1950-01-01 to 1983-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Santa Ana Sand & Gravel → Baca Pit; 1983-10-19 to 1987-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Santa Ana Pueblo Indian Tribe → Baca Pit; 1983-10-19 to 1987-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Santa Ana Pueblo Indian Tribe → Santa Ana Sand & Gravel; 1983-10-19 to 1987-03-25; source msha-controller-operator-history
- **operator_operates_mine:** American Building Supply Inc → Baca Pit; 1987-03-26 to 1999-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Anthony  Tafoya → Baca Pit; 1987-03-26 to 1999-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  Tafoya → American Building Supply Inc; 1987-03-26 to 1999-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Baca Pit; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Waycor Materials, Inc. → Baca Pit; 1999-02-28 to 2015-05-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Baca Pit; 1999-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Waycor Materials, Inc.; 1999-02-28 to 2015-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Baca Pit; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cal Mat Co → Baca Pit; 2015-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Cal Mat Co; 2015-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Cal Mat Co; 2015-05-05 to 2007-11-15; source msha-controller-operator-history