# Relationship history for MSHA mine 0504253

Current hierarchy: **George  Christodoulou; David  Badner er al → Gold Hill Minerals Inc. → Bueno Mill**

- 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:** Van Dyke David → Bueno Mill; 1986-11-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Van Dyke Minerals Ltd → Bueno Mill; 1987-09-01 to 2006-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Van Dyke David → Van Dyke Minerals Ltd; 1987-09-01 to 2006-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Merendon Mining (Colorado) Inc → Bueno Mill; 2006-10-19 to 2012-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Merendon Mining (Nevada) Inc → Bueno Mill; 2006-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merendon Mining (Nevada) Inc → Merendon Mining (Colorado) Inc; 2006-10-19 to 2012-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Gold Hill Minerals Inc. → Bueno Mill; 2012-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Christodoulou et al → Bueno Mill; 2012-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Christodoulou et al → Gold Hill Minerals Inc.; 2012-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Badner er al → Gold Hill Minerals Inc.; 2012-02-24 to current/open; source msha-controller-operator-history