# Relationship history for MSHA mine 1517727

Current hierarchy: **Thomas Chester & Kenneth O Taylor Sr → Black Diamond Resources Inc → Shamrock 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:** Shamrock Mining Inc → Shamrock Mine; 1995-11-01 to 1997-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Charles R  Collins → Shamrock Mine; 1995-11-01 to 1997-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Collins → Shamrock Mining Inc; 1995-11-01 to 1997-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Mining Company Inc → Shamrock Mine; 1997-03-21 to 1998-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Vincent Gregory N → Shamrock Mine; 1997-03-21 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Vincent Gregory N → Shamrock Mining Company Inc; 1997-03-21 to 1998-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Mining Company Inc → Shamrock Mine; 1998-01-14 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Whitledge Stephen B → Shamrock Mine; 1998-01-14 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Whitledge Stephen B → Shamrock Mining Company Inc; 1998-01-14 to 1998-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Mining Company Inc → Shamrock Mine; 1999-01-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Vincent Gregory N → Shamrock Mining Company Inc; 1999-01-01 to 1999-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Resources Inc → Shamrock Mine; 1999-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Chester & Kenneth O Taylor Sr → Shamrock Mine; 1999-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Chester & Kenneth O Taylor Sr → Black Diamond Resources Inc; 1999-06-16 to current/open; source msha-controller-operator-history