# Relationship history for MSHA mine 4609612

Current hierarchy: **Mohegan Energy Trustees LLC → Onyx Energy, LLC → Highwall Park Surface 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

- **controller_controls_mine:** Richard G  Preservati II → Highwall Park Surface Mine; 2008-12-04 to 2018-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Justus → Highwall Park Surface Mine; 2016-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mohegan Energy Trustees LLC → Highwall Park Surface Mine; 2018-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Onyx Energy, LLC → Highwall Park Surface Mine; 2021-10-25 to 2024-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Mohegan Energy Trustees LLC → Onyx Energy, LLC; 2021-10-25 to 2024-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Onyx Energy, LLC; 2021-10-25 to 2018-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Monument Mining, Inc. → Highwall Park Surface Mine; 2024-09-04 to 2026-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Justus → Monument Mining, Inc.; 2024-09-04 to 2026-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Onyx Energy, LLC → Highwall Park Surface Mine; 2026-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mohegan Energy Trustees LLC → Onyx Energy, LLC; 2026-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Onyx Energy, LLC; 2026-09-16 to 2018-05-15; source msha-controller-operator-history