# Relationship history for MSHA mine 4503693

Current hierarchy: **Aurora Natural Resources Group Inc → Kent Resources Inc. → Flagstaff Barite 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:** North Columbia Enterprises LLC → Flagstaff Barite Mine; 2011-07-21 to 2014-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Graeme  O'Neill → Flagstaff Barite Mine; 2011-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graeme  O'Neill → North Columbia Enterprises LLC; 2011-07-21 to 2014-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Kent Resources Inc. → Flagstaff Barite Mine; 2014-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aurora Natural Resources Group Inc → Flagstaff Barite Mine; 2014-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aurora Natural Resources Group Inc → Kent Resources Inc.; 2014-08-04 to current/open; source msha-controller-operator-history