# Relationship history for MSHA mine 0203432

Current hierarchy: **Russ  Myers → RMC Mining Development, LLC → Harquahala 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:** Bonanza Mining Company → Harquahala Mine; 2020-06-29 to 2023-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Goldrock Resources Inc et al → Harquahala Mine; 2020-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goldrock Resources Inc et al → Bonanza Mining Company; 2020-06-29 to 2023-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Tombstone Exploration Co  et al → Bonanza Mining Company; 2020-06-29 to 2023-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Russ  Myers → Harquahala Mine; 2021-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** RMC Mining Development, LLC → Harquahala Mine; 2023-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russ  Myers → RMC Mining Development, LLC; 2023-07-13 to current/open; source msha-controller-operator-history