# Relationship history for MSHA mine 0400898

Current hierarchy: **Dickey Donald R → Dickey Exploration Company Inc → Oriental**

- 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:** Hecla Mining Company → Oriental; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ranchers Exploration & Development Corp → Oriental; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickey Exploration Company Inc → Oriental; 1950-01-01 to 1984-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Dickey Donald R → Oriental; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dickey Donald R → Dickey Exploration Company Inc; 1950-01-01 to 1984-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Ranchers Exploration & Development Corp → Oriental; 1984-04-24 to 1984-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Ranchers Exploration & Development Corp → Ranchers Exploration & Development Corp; 1984-04-24 to 1984-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Mining Company → Oriental; 1984-07-26 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Mining Company; 1984-07-26 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Dickey Exploration Company Inc → Oriental; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dickey Donald R → Dickey Exploration Company Inc; 1985-07-01 to current/open; source msha-controller-operator-history