# Relationship history for MSHA mine 2901961

Current hierarchy: **Vulcan Materials Company → CalMat Co → SANTA FE 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:** Blotter Construction Inc → SANTA FE PIT; 1984-05-01 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Blotter Richard → SANTA FE PIT; 1984-05-01 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Blotter Richard → Blotter Construction Inc; 1984-05-01 to 1995-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Santa Fe Inc → SANTA FE PIT; 1995-03-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → SANTA FE PIT; 1995-03-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Mobile Santa Fe Inc; 1995-03-01 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Santa Fe Inc → SANTA FE PIT; 1998-02-11 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → SANTA FE PIT; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Santa Fe Inc; 1998-02-11 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → SANTA FE PIT; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → SANTA FE PIT; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → SANTA FE PIT; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2014-08-29 to 2007-11-15; source msha-controller-operator-history