# Relationship history for MSHA mine 2601736

Current hierarchy: **Bates James → Cliff Resources Inc-Green Hill Mining Venture → Olinghouse 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Oraco → Olinghouse Mine; 1981-06-01 to 1984-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Smith Ted V → Olinghouse Mine; 1981-06-01 to 1984-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Smith Ted V → Oraco; 1981-06-01 to 1984-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Mining Group Inc → Olinghouse Mine; 1984-04-16 to 1988-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Mining Group Inc & Nevada Pacific Placer Pr → Olinghouse Mine; 1984-04-16 to 1988-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Mining Group Inc & Nevada Pacific Placer Pr → Kiewit Mining Group Inc; 1984-04-16 to 1988-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Cliff Resources Inc-Green Hill Mining Venture → Olinghouse Mine; 1988-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bates James → Olinghouse Mine; 1988-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bates James → Cliff Resources Inc-Green Hill Mining Venture; 1988-03-02 to current/open; source msha-controller-operator-history