# Relationship history for MSHA mine 2601427

Current hierarchy: **Klaus  Althammer → Bonanza Opal Mines, Inc. → Bonanza Opal Mines, Inc.**

- 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:** G Keith Hodson → Bonanza Opal Mines, Inc.; 1950-01-01 to 2014-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Hodson G Keith → Bonanza Opal Mines, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hodson G Keith → G Keith Hodson; 1950-01-01 to 2014-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Bonanza Opal Mines, Inc. → Bonanza Opal Mines, Inc.; 2014-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Klaus  Althammer et al → Bonanza Opal Mines, Inc.; 2014-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klaus  Althammer et al → Bonanza Opal Mines, Inc.; 2014-07-03 to current/open; source msha-controller-operator-history