# Relationship history for MSHA mine 2601516

Current hierarchy: **Nevada Barite Inc → Edgar-Morgan Mining Company Inc → Rimrock Properties**

- 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:** Baker Hughes Inc → Rimrock Properties; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nevada Barite Inc → Rimrock Properties; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R W Johnson Mining → Rimrock Properties; 1979-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Johnson R W → Rimrock Properties; 1979-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Johnson R W → R W Johnson Mining; 1979-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Brown & Root Western Inc → Rimrock Properties; 1979-07-01 to 1979-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Halliburton Company → Rimrock Properties; 1979-07-01 to 1979-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Brown & Root Western Inc; 1979-07-01 to 1979-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Milchem Inc → Rimrock Properties; 1979-09-01 to 1979-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Baker Hughes Inc → Milchem Inc; 1979-09-01 to 1979-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Meissner Donald O & Duane H Porter → Rimrock Properties; 1979-09-01 to 1981-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Porter & Meissner Mining → Rimrock Properties; 1979-10-23 to 1981-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Meissner Donald O & Duane H Porter → Porter & Meissner Mining; 1979-10-23 to 1981-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Edgar-Morgan Mining Company Inc → Rimrock Properties; 1981-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nevada Barite Inc → Edgar-Morgan Mining Company Inc; 1981-01-29 to current/open; source msha-controller-operator-history