# Relationship history for MSHA mine 0503460

Current hierarchy: **George  Christodoulou; David  Badner er al → Gold Hill Minerals Inc → Black Rose**

- 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

- **controller_controls_mine:** Mehl Robert L → Black Rose; 1979-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jamestown Mining Company → Black Rose; 1980-06-01 to 1983-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Mehl Robert L → Jamestown Mining Company; 1980-06-01 to 1983-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Black Rose Mining Company → Black Rose; 1983-10-13 to 2007-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Williams Tom & Michael B Smith → Black Rose; 1983-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Tom & Michael B Smith → Black Rose Mining Company; 1983-10-13 to 2007-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Merendon Mining (Nevada) Inc → Black Rose; 2006-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Merendon Mining (Colorado) Inc → Black Rose; 2007-01-17 to 2012-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Merendon Mining (Nevada) Inc → Merendon Mining (Colorado) Inc; 2007-01-17 to 2012-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Gold Hill Minerals Inc → Black Rose; 2012-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Badner er al → Black Rose; 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
- **controller_controls_operator:** George  Christodoulou et al → Gold Hill Minerals Inc; 2012-02-24 to current/open; source msha-controller-operator-history