# Relationship history for MSHA mine 0301993

Current hierarchy: **Orville  Murphy; Cheryl  Murphy → Board Camp Crystal Mine LLC → Board Camp Crystal 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:** Homeland America, LLC → Board Camp Crystal Mine; 2010-05-10 to 2019-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Orville  Murphy et al → Board Camp Crystal Mine; 2010-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orville  Murphy et al → Homeland America, LLC; 2010-05-10 to 2019-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl  Murphy et al → Homeland America, LLC; 2010-05-10 to 2019-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Board Camp Crystal Mine LLC → Board Camp Crystal Mine; 2019-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Orville  Murphy et al → Board Camp Crystal Mine; 2019-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orville  Murphy et al → Board Camp Crystal Mine LLC; 2019-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl  Murphy et al → Board Camp Crystal Mine LLC; 2019-04-30 to current/open; source msha-controller-operator-history