# Relationship history for MSHA mine 0202285

Current hierarchy: **Roddy Resources Canada Inc → Roddy Resources (Arizona) Inc → Big Horn Mine**

- 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:** J Devins Resource Group Inc → Big Horn Mine; 1986-02-01 to 1989-03-14; source msha-controller-operator-history
- **controller_controls_mine:** T W D Resources Ltd → Big Horn Mine; 1986-02-01 to 1989-03-14; source msha-controller-operator-history
- **controller_controls_operator:** T W D Resources Ltd → J Devins Resource Group Inc; 1986-02-01 to 1989-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Roddy Resources (Arizona) Inc → Big Horn Mine; 1989-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roddy Resources Canada Inc → Big Horn Mine; 1989-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roddy Resources Canada Inc → Roddy Resources (Arizona) Inc; 1989-03-15 to current/open; source msha-controller-operator-history