# Relationship history for MSHA mine 2602665

Current hierarchy: **Colas S A → United Rock Products → Goodsprings 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:** Colas S A → Goodsprings Mine; 1999-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tracy A Davis et al → Goodsprings Mine; 2005-06-27 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Goodsprings Mine; 2008-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Iron Works LLC → Goodsprings Mine; 2008-10-13 to 2012-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Tracy A Davis et al → Southwest Iron Works LLC; 2008-10-13 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Nicholle R Davis et al → Southwest Iron Works LLC; 2008-10-13 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Southwest Iron Works LLC; 2008-10-13 to 2012-06-28; source msha-controller-operator-history
- **operator_operates_mine:** United Rock Products → Goodsprings Mine; 2012-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → United Rock Products; 2012-06-29 to current/open; source msha-controller-operator-history