# Relationship history for MSHA mine 0504461

Current hierarchy: **Allegiance Coal LTD → New Elk Coal Company LLC → New Elk Prep Plant**

- 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:** Basin Resources Inc → New Elk Prep Plant; 1991-06-01 to 1997-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Montana Power Company → New Elk Prep Plant; 1991-06-01 to 2004-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Montana Power Company → Basin Resources Inc; 1991-06-01 to 1997-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Picketwire Processing LLC → New Elk Prep Plant; 1997-06-01 to 2006-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Erik  Addington et al → New Elk Prep Plant; 1997-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erik  Addington et al → Picketwire Processing LLC; 1997-06-01 to 2006-05-04; source msha-controller-operator-history
- **controller_controls_operator:** A Bruce  Addington et al → Picketwire Processing LLC; 1997-06-01 to 2006-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → New Elk Prep Plant; 2004-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Basin Resources Inc; 2004-10-25 to 1997-05-31; source msha-controller-operator-history
- **operator_operates_mine:** New Elk Coal Company LLC → New Elk Prep Plant; 2006-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Coverdale et al → New Elk Prep Plant; 2006-05-05 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Coverdale et al → New Elk Coal Company LLC; 2006-05-05 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_operator:** John  McCulloch et al → New Elk Coal Company LLC; 2006-05-05 to 2009-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Cline Mining Corporation et al → New Elk Prep Plant; 2009-06-10 to 2020-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Cline Mining Corporation et al → New Elk Coal Company LLC; 2009-06-10 to 2020-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Allegiance Coal LTD → New Elk Prep Plant; 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