# Relationship history for MSHA mine 2401589

Current hierarchy: **Ernist  Harrison → Millstream Mines Inc → Tamarack**

- 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:** Sheridan Venture → Tamarack; 1982-01-01 to 1995-12-25; source msha-controller-operator-history
- **controller_controls_mine:** Lopata Edward J-James Tolson & Terry Thompson → Tamarack; 1982-01-01 to 1995-12-25; source msha-controller-operator-history
- **controller_controls_operator:** Lopata Edward J-James Tolson & Terry Thompson → Sheridan Venture; 1982-01-01 to 1995-12-25; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Rex & Kenneth Et Al → Tamarack; 1993-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Rocky Mountain Mining Corp → Tamarack; 1995-12-26 to 2008-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Rex & Kenneth Et Al → Great Rocky Mountain Mining Corp; 1995-12-26 to 2008-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Millstream Mines Inc → Tamarack; 2008-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ernist  Harrison → Tamarack; 2008-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernist  Harrison → Millstream Mines Inc; 2008-05-20 to current/open; source msha-controller-operator-history