# Relationship history for MSHA mine 0504975

Current hierarchy: **Allegiance Coal LTD → New Elk Coal Company LLC → Mi Vida Portals**

- 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:** Wayne  Coverdale et al → Mi Vida Portals; 2006-05-05 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Cline Mining Corporation et al → Mi Vida Portals; 2009-06-10 to 2020-10-25; source msha-controller-operator-history
- **controller_controls_mine:** David A  Schaaf  et al → Mi Vida Portals; 2010-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TK Mining Services LLC → Mi Vida Portals; 2011-05-17 to 2012-02-15; source msha-controller-operator-history
- **controller_controls_operator:** David A  Schaaf  et al → TK Mining Services LLC; 2011-05-17 to 2012-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Buhrdorf et al → TK Mining Services LLC; 2011-05-17 to 2012-02-15; source msha-controller-operator-history
- **operator_operates_mine:** New Elk Coal Company LLC → Mi Vida Portals; 2012-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Coverdale et al → New Elk Coal Company LLC; 2012-02-16 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_operator:** John  McCulloch et al → New Elk Coal Company LLC; 2012-02-16 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Cline Mining Corporation et al → New Elk Coal Company LLC; 2012-02-16 to 2020-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Allegiance Coal LTD → Mi Vida Portals; 2020-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allegiance Coal LTD → New Elk Coal Company LLC; 2020-10-26 to current/open; source msha-controller-operator-history