# Relationship history for MSHA mine 0500433

Current hierarchy: **Hecla Mining Company → Mwca Inc → MESITA HILL**

- 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

- **operator_operates_mine:** Colorado Aggregate Company Inc → MESITA HILL; 1950-01-01 to 1982-08-23; source msha-controller-operator-history
- **controller_controls_mine:** George M  Oringdulph → MESITA HILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George M  Oringdulph → Colorado Aggregate Company Inc; 1950-01-01 to 1982-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Aggregate Company → MESITA HILL; 1982-08-24 to 1983-11-10; source msha-controller-operator-history
- **controller_controls_mine:** Petroleum Corp Of America → MESITA HILL; 1982-08-24 to 1983-11-10; source msha-controller-operator-history
- **controller_controls_operator:** Petroleum Corp Of America → Colorado Aggregate Company; 1982-08-24 to 1983-11-10; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Aggregate Company Of New Mexico → MESITA HILL; 1983-11-11 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Ranchers Exploration & Development Corp → MESITA HILL; 1983-11-11 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Ranchers Exploration & Development Corp → Colorado Aggregate Company Of New Mexico; 1983-11-11 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → MESITA HILL; 1987-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mwca Inc → MESITA HILL; 1987-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Mwca Inc; 1987-06-15 to current/open; source msha-controller-operator-history