# Relationship history for MSHA mine 4003327

Current hierarchy: **Damian  Caldwell → Mountainside Coal Company, Inc. → Tackett Mine # 2**

- 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:** Dan  Chambers et al → Tackett Mine # 2; 1983-09-01 to 2013-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Mountainside Coal Company, Inc. → Tackett Mine # 2; 2008-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Chambers et al → Mountainside Coal Company, Inc.; 2008-06-16 to 2013-10-06; source msha-controller-operator-history
- **controller_controls_mine:** River Energy JV UK Limited → Tackett Mine # 2; 2013-10-07 to 2021-04-15; source msha-controller-operator-history
- **controller_controls_operator:** River Energy JV UK Limited → Mountainside Coal Company, Inc.; 2013-10-07 to 2021-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Damian  Caldwell → Tackett Mine # 2; 2021-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Damian  Caldwell → Mountainside Coal Company, Inc.; 2021-04-16 to current/open; source msha-controller-operator-history