# Relationship history for MSHA mine 4601968

Current hierarchy: **ACNR Holdings, Inc → Monongalia County Coal Resources, Inc. → Monongalia County 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Consolidation Coal Company → Monongalia County Mine; 1950-01-01 to 2016-01-03; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Monongalia County Mine; 1950-01-01 to 2013-12-04; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Consolidation Coal Company; 1950-01-01 to 2013-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Monongalia County Mine; 2013-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Consolidation Coal Company; 2013-12-05 to 2016-01-03; source msha-controller-operator-history
- **operator_operates_mine:** The Monongalia County Coal Company → Monongalia County Mine; 2016-01-04 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Monongalia County Mine; 2016-01-04 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → The Monongalia County Coal Company; 2016-01-04 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_mine:** ACNR Holdings, Inc → Monongalia County Mine; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACNR Holdings, Inc → The Monongalia County Coal Company; 2020-09-17 to 2020-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Monongalia County Coal Resources, Inc. → Monongalia County Mine; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACNR Holdings, Inc → Monongalia County Coal Resources, Inc.; 2020-09-17 to current/open; source msha-controller-operator-history