# Relationship history for MSHA mine 2601561

Current hierarchy: **Rory L  Tibbals; Joyce E  Johnson → Remtech L L C → Tuscarora**

- 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:** Tuscaroro Associates → Tuscarora; 1979-10-01 to 1983-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Navajo Minerals & Agau Exploration → Tuscarora; 1979-10-01 to 1983-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Navajo Minerals & Agau Exploration → Tuscaroro Associates; 1979-10-01 to 1983-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Durning P → Tuscarora; 1983-10-01 to 1987-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Fischer-Watt Mining Company Inc → Tuscarora; 1983-10-27 to 1987-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Durning P → Fischer-Watt Mining Company Inc; 1983-10-27 to 1987-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Gold Corp → Tuscarora; 1985-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Horizon Gold Shares Inc → Tuscarora; 1987-07-24 to 1994-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Gold Corp → Horizon Gold Shares Inc; 1987-07-24 to 1994-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Roy A  Walker → Tuscarora; 1992-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W E S Construction Company Inc → Tuscarora; 1994-04-29 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Roy A  Walker → W E S Construction Company Inc; 1994-04-29 to 1995-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Remtech L L C → Tuscarora; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joyce E  Johnson et al → Tuscarora; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joyce E  Johnson et al → Remtech L L C; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rory L  Tibbals et al → Remtech L L C; 1995-09-01 to current/open; source msha-controller-operator-history