# Relationship history for MSHA mine 0405276

Current hierarchy: **Ana M  Clarke → DV Natural Resources, LLC → Briggs 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

- **controller_controls_mine:** Canyon Resources Corp → Briggs Mine; 1990-08-27 to 2008-03-17; source msha-controller-operator-history
- **operator_operates_mine:** CR Briggs → Briggs Mine; 1995-11-01 to 2016-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Canyon Resources Corp → CR Briggs; 1995-11-01 to 2008-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Atna Resources Ltd. → Briggs Mine; 2008-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atna Resources Ltd. → CR Briggs; 2008-03-18 to 2016-05-12; source msha-controller-operator-history
- **operator_operates_mine:** DV Natural Resources, LLC → Briggs Mine; 2016-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ana M  Clarke → Briggs Mine; 2016-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ana M  Clarke → DV Natural Resources, LLC; 2016-05-13 to current/open; source msha-controller-operator-history