# Relationship history for MSHA mine 2900234

Current hierarchy: **Metallic Ventures Gold Inc → Cobre Mining Company Inc → Continental Mill #1**

- 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:** U V Industries Inc → Continental Mill #1; 1950-01-01 to 1980-01-17; source msha-controller-operator-history
- **controller_controls_mine:** U V Industries Inc → Continental Mill #1; 1950-01-01 to 1992-12-31; source msha-controller-operator-history
- **controller_controls_operator:** U V Industries Inc → U V Industries Inc; 1950-01-01 to 1980-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Sharon Steel Corp → Continental Mill #1; 1980-01-18 to 1993-04-22; source msha-controller-operator-history
- **controller_controls_mine:** NVF Company → Continental Mill #1; 1980-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NVF Company → Sharon Steel Corp; 1980-01-18 to 1993-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Metallic Ventures Gold Inc → Continental Mill #1; 1993-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cobre Mining Company Inc → Continental Mill #1; 1993-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metallic Ventures Gold Inc → Cobre Mining Company Inc; 1993-04-23 to current/open; source msha-controller-operator-history