# Relationship history for MSHA mine 2900189

Current hierarchy: **CR Minerals Company LLC → Cr Minerals Company LLC → ROCKY MOUNTAIN 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** General Pumice Corp → ROCKY MOUNTAIN MINE; 1950-01-01 to 1996-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Rayford  Alley → ROCKY MOUNTAIN MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rayford  Alley → General Pumice Corp; 1950-01-01 to 1996-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Canyon Resources Corp → ROCKY MOUNTAIN MINE; 1987-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → ROCKY MOUNTAIN MINE; 1995-03-01 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Santa Fe Inc → ROCKY MOUNTAIN MINE; 1996-12-01 to 1997-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Mobile Santa Fe Inc; 1996-12-01 to 1997-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cr Minerals Corp → ROCKY MOUNTAIN MINE; 1998-01-01 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Canyon Resources Corp → Cr Minerals Corp; 1998-01-01 to 1998-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cr Minerals Company LLC → ROCKY MOUNTAIN MINE; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CR Minerals Company LLC → ROCKY MOUNTAIN MINE; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CR Minerals Company LLC → Cr Minerals Company LLC; 1999-01-01 to current/open; source msha-controller-operator-history