# Relationship history for MSHA mine 3602176

Current hierarchy: **Blaschak Holding Corp → Blaschak Coal Corp → Mammoth Colliery**

- 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:** Jeddo-Highland Coal Company → Mammoth Colliery; 1950-01-01 to 1998-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Pagnotti Enterprises Inc → Mammoth Colliery; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pagnotti Enterprises Inc → Jeddo-Highland Coal Company; 1950-01-01 to 1998-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Blaschak Holding Corp → Mammoth Colliery; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Son Rise Energy Inc → Mammoth Colliery; 1998-11-12 to 1999-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Gerald M  Ference et al → Mammoth Colliery; 1998-11-12 to 1999-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Gerald M  Ference et al → Son Rise Energy Inc; 1998-11-12 to 1999-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Jeddo-Highland Coal Company → Mammoth Colliery; 1999-03-22 to 1999-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Pagnotti Enterprises Inc → Jeddo-Highland Coal Company; 1999-03-22 to 1999-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Blaschak Coal Corp → Mammoth Colliery; 1999-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaschak Holding Corp → Blaschak Coal Corp; 1999-06-25 to current/open; source msha-controller-operator-history