# Relationship history for MSHA mine 2601674

Current hierarchy: **Ireland Inc → Columbus SM LLC → Columbus Project**

- 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:** Dallas Mines Nevada Inc → Columbus Project; 1980-09-01 to 1999-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence T  Atkinson → Columbus Project; 1980-09-01 to 1999-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence T  Atkinson → Dallas Mines Nevada Inc; 1980-09-01 to 1999-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Columbus SM LLC → Columbus Project; 1999-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Arkoosh  et al → Columbus Project; 1999-09-04 to 2008-07-24; source msha-controller-operator-history
- **controller_controls_operator:** John  Arkoosh  et al → Columbus SM LLC; 1999-09-04 to 2008-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Ireland Inc → Columbus Project; 2008-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ireland Inc → Columbus SM LLC; 2008-07-25 to current/open; source msha-controller-operator-history