# Relationship history for MSHA mine 4400271

Current hierarchy: **Michael D  Robinson; James T  O'Connor → PMO Virginia LLC → Red Onion No. 1**

- 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:** Clinchfield Coal Company → Red Onion No. 1; 1950-01-01 to 2009-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Red Onion No. 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Clinchfield Coal Company; 1950-01-01 to 2009-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Red Onion No. 1; 2002-12-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickenson-Russell Coal Company LLC → Red Onion No. 1; 2009-10-26 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Dickenson-Russell Coal Company LLC; 2009-10-26 to 2016-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Dickenson-Russell Contura, LLC → Red Onion No. 1; 2016-07-26 to 2019-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Red Onion No. 1; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Dickenson-Russell Contura, LLC; 2016-07-26 to 2019-01-27; source msha-controller-operator-history
- **operator_operates_mine:** PMO Virginia LLC → Red Onion No. 1; 2019-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Robinson et al → Red Onion No. 1; 2019-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Robinson et al → PMO Virginia LLC; 2019-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James T  O'Connor et al → PMO Virginia LLC; 2019-01-28 to current/open; source msha-controller-operator-history