# Relationship history for MSHA mine 4502882

Current hierarchy: **Cemex S A → Rinker Materials → Proctor Creek 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:** Morehead Construction Company Inc → Proctor Creek Pit; 1980-11-01 to 1987-11-09; source msha-controller-operator-history
- **controller_controls_mine:** John  Morehead → Proctor Creek Pit; 1980-11-01 to 1987-11-09; source msha-controller-operator-history
- **controller_controls_operator:** John  Morehead → Morehead Construction Company Inc; 1980-11-01 to 1987-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Taylor  et al → Proctor Creek Pit; 1986-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caunt John W → Proctor Creek Pit; 1987-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Concrete Company → Proctor Creek Pit; 1987-11-10 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cadman Concrete Company; 1987-11-10 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Jon M  Magnussen  et al → Cadman Concrete Company; 1987-11-10 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Proctor Creek Pit; 1988-07-20 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Proctor Creek Pit; 1990-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Concrete Company Inc → Proctor Creek Pit; 1991-01-02 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Proctor Creek Pit; 1991-01-02 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Cadman Concrete Company Inc; 1991-01-02 to 1994-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Hos Brothers Construction Inc → Proctor Creek Pit; 1994-08-15 to 1997-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Caunt John W → Hos Brothers Construction Inc; 1994-08-15 to 1997-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Csr Associated → Proctor Creek Pit; 1997-06-09 to 2001-09-30; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Csr Associated; 1997-06-09 to 2001-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials → Proctor Creek Pit; 2001-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials; 2001-10-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Proctor Creek Pit; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Proctor Creek Pit; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials; 2007-07-10 to current/open; source msha-controller-operator-history