# Relationship history for MSHA mine 3609253

Current hierarchy: **John W  Rich Jr → Waste Management & Processors, Inc. → Big Mine Run**

- 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

- **controller_controls_mine:** John W  Rich Jr et al → Big Mine Run; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stanley Kroh Coal → Big Mine Run; 2004-06-04 to 2006-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Stanley S  Kroh → Big Mine Run; 2004-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley S  Kroh → Stanley Kroh Coal; 2004-06-04 to 2006-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Fox Coal Company Inc. → Big Mine Run; 2006-10-16 to 2022-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Vincent  Guarna et al → Big Mine Run; 2006-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Guarna et al → Fox Coal Company Inc.; 2006-10-16 to 2022-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Fox Coal Company Inc.; 2006-10-16 to 2022-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Waste Management & Processors, Inc. → Big Mine Run; 2022-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich Jr et al → Waste Management & Processors, Inc.; 2022-08-26 to current/open; source msha-controller-operator-history