# Relationship history for MSHA mine 2601933

Current hierarchy: **U S Gold Corporation → Tonkin Springs LLC → Tonkin Springs**

- 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:** Tonkin Springs Gold Mining Company → Tonkin Springs; 1985-08-01 to 1991-02-12; source msha-controller-operator-history
- **controller_controls_mine:** William W  Reed → Tonkin Springs; 1985-08-01 to 1991-02-12; source msha-controller-operator-history
- **controller_controls_operator:** William W  Reed → Tonkin Springs Gold Mining Company; 1985-08-01 to 1991-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Denay Creek Gold Mining Company → Tonkin Springs; 1991-02-13 to 1997-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Homestake Mining Co & Tonkin Springs Gold Mining C → Tonkin Springs; 1991-02-13 to 1997-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Homestake Mining Co & Tonkin Springs Gold Mining C → Denay Creek Gold Mining Company; 1991-02-13 to 1997-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Gold Capital Corp → Tonkin Springs; 1997-08-29 to 1999-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Globex Mining Enterprises Inc → Tonkin Springs; 1997-08-29 to 1999-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Globex Mining Enterprises Inc → Gold Capital Corp; 1997-08-29 to 1999-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Tonkin Springs LLC → Tonkin Springs; 1999-05-01 to 2003-07-31; source msha-controller-operator-history
- **controller_controls_mine:** U S Gold Corporation → Tonkin Springs; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Gold Corporation → Tonkin Springs LLC; 1999-05-01 to 2003-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Bactech Nevada Corporation → Tonkin Springs; 2003-08-01 to 2005-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Bactech Enviromet Corp & U S Gold Corp → Tonkin Springs; 2003-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bactech Enviromet Corp & U S Gold Corp → Bactech Nevada Corporation; 2003-08-01 to 2005-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Tonkin Springs LLC → Tonkin Springs; 2005-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Gold Corporation → Tonkin Springs LLC; 2005-05-12 to current/open; source msha-controller-operator-history