# Relationship history for MSHA mine 2000038

Current hierarchy: **VOTORANTIM CIMENTOS → St. Marys Cement U.S. LLC → St. Marys Cement-Charlevoix**

- 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:** Medusa Cement Company → St. Marys Cement-Charlevoix; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → St. Marys Cement-Charlevoix; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Cement Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → St. Marys Cement-Charlevoix; 1950-01-01 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → St. Marys Cement-Charlevoix; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → St. Marys Cement-Charlevoix; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → St. Marys Cement-Charlevoix; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Cement Company; 1979-01-01 to 1988-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Portland Cement Company → St. Marys Cement-Charlevoix; 1988-10-07 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Portland Cement Company; 1988-10-07 to 1998-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → St. Marys Cement-Charlevoix; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southdown Inc → St. Marys Cement-Charlevoix; 1998-06-30 to 2000-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Southdown Inc; 1998-06-30 to 2000-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → St. Marys Cement-Charlevoix; 2000-11-03 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Inc; 2000-11-03 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → St. Marys Cement-Charlevoix; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** St. Marys Cement U.S. LLC → St. Marys Cement-Charlevoix; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → St. Marys Cement U.S. LLC; 2005-04-01 to current/open; source msha-controller-operator-history