# Relationship history for MSHA mine 0900002

Current hierarchy: **David W  Dye; Randy K  Smith → Echols Mill Quarries → Harmony Blue Quarry**

- 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:** Bennie & Harvey Quarries Inc → Harmony Blue Quarry; 1950-01-01 to 1996-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Allan  Mc Garity → Harmony Blue Quarry; 1950-01-01 to 1996-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Allan  Mc Garity → Bennie & Harvey Quarries Inc; 1950-01-01 to 1996-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Blaine  Worley → Harmony Blue Quarry; 1993-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Worley Quarries Inc → Harmony Blue Quarry; 1996-03-21 to 2020-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Blaine  Worley → Worley Quarries Inc; 1996-03-21 to 2020-11-24; source msha-controller-operator-history
- **controller_controls_mine:** David W  Dye  et al → Harmony Blue Quarry; 2008-03-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Echols Mill Quarries → Harmony Blue Quarry; 2020-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David W  Dye  et al → Echols Mill Quarries; 2020-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy K  Smith  et al → Echols Mill Quarries; 2020-11-25 to current/open; source msha-controller-operator-history