# Relationship history for MSHA mine 0504850

Current hierarchy: **Pioneer Natural Resources USA Incorporated → Carmeuse Industrial Sands → Jemadojin Sand 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Oglebay Norton Company → Jemadojin Sand Pit; 1950-01-01 to 2008-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Carmeuse Industrial Sands → Jemadojin Sand Pit; 2006-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Carmeuse Industrial Sands; 2006-10-31 to 2008-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Jemadojin Sand Pit; 2008-02-13 to 2012-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Carmeuse Industrial Sands; 2008-02-13 to 2012-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer Natural Resources USA Incorporated → Jemadojin Sand Pit; 2012-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer Natural Resources USA Incorporated → Carmeuse Industrial Sands; 2012-04-02 to current/open; source msha-controller-operator-history