# Relationship history for MSHA mine 0501065

Current hierarchy: **Blue Rock Resources Ltd → Blue Rock Energy Corp → Sunbeam**

- 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

- **operator_operates_mine:** Union Carbide Corp → Sunbeam; 1950-01-01 to 1987-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → Sunbeam; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Union Carbide Corp; 1950-01-01 to 1987-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Urralburu Ben → Sunbeam; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tony Lobato Mining Company → Sunbeam; 1987-12-13 to 1988-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Lobato Tony → Sunbeam; 1987-12-13 to 1988-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Lobato Tony → Tony Lobato Mining Company; 1987-12-13 to 1988-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Urralburu Mining Company → Sunbeam; 1988-08-08 to 2007-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Urralburu Ben → Urralburu Mining Company; 1988-08-08 to 2007-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Blue Rock Resources Ltd → Sunbeam; 2007-11-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Rock Energy Corp → Sunbeam; 2007-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Rock Resources Ltd → Blue Rock Energy Corp; 2007-11-30 to current/open; source msha-controller-operator-history