# Relationship history for MSHA mine 1100118

Current hierarchy: **VOTORANTIM CIMENTOS → St. Marys Cement U.S. LLC → St. Mary's Cement -Dixon**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Lone Star Industries Inc → St. Mary's Cement -Dixon; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Cement Company → St. Mary's Cement -Dixon; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → St. Mary's Cement -Dixon; 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
- **operator_operates_mine:** Medusa Cement Company → St. Mary's Cement -Dixon; 1979-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → St. Mary's Cement -Dixon; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Cement Company; 1979-01-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → St. Mary's Cement -Dixon; 1980-04-01 to 1984-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1980-04-01 to 1984-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Dixon-Marquette Cement Inc → St. Mary's Cement -Dixon; 1984-05-01 to 2003-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Prairie Group → St. Mary's Cement -Dixon; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prairie Group → Dixon-Marquette Cement Inc; 1984-05-01 to 2003-09-24; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → St. Mary's Cement -Dixon; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Central Plains, L.L.C. → St. Mary's Cement -Dixon; 2003-09-25 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → St. Mary's Cement -Dixon; 2003-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Central Plains, L.L.C.; 2003-09-25 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** St. Marys Cement  (US) → St. Mary's Cement -Dixon; 2005-04-01 to 2009-04-27; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → St. Marys Cement  (US); 2005-04-01 to 2009-04-27; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → St. Mary's Cement -Dixon; 2008-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie, Inc. → St. Mary's Cement -Dixon; 2009-04-28 to 2015-01-06; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie, Inc.; 2009-04-28 to 2015-01-06; source msha-controller-operator-history
- **operator_operates_mine:** St. Marys Cement U.S. LLC → St. Mary's Cement -Dixon; 2015-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → St. Marys Cement U.S. LLC; 2015-01-07 to current/open; source msha-controller-operator-history