# Relationship history for MSHA mine 0404860

Current hierarchy: **Atna Resources Ltd. → Cr Briggs → Briggs**

- 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:** David L Pruett → Briggs; 1987-01-01 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_mine:** David L  Pruett → Briggs; 1987-01-01 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_operator:** David L  Pruett → David L Pruett; 1987-01-01 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Addington Larry → Briggs; 1989-02-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Addwest Gold Inc → Briggs; 1989-06-29 to 1990-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Addington Larry → Addwest Gold Inc; 1989-06-29 to 1990-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Cr Briggs → Briggs; 1990-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Canyon Resources Corp → Briggs; 1990-08-27 to 2008-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Canyon Resources Corp → Cr Briggs; 1990-08-27 to 2008-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Atna Resources Ltd. → Briggs; 2008-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atna Resources Ltd. → Cr Briggs; 2008-03-18 to current/open; source msha-controller-operator-history