# Relationship history for MSHA mine 3608733

Current hierarchy: **Alpha Natural Resources, Inc. → AMFIRE Mining Company LLC → Ridge Deep 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

- **controller_controls_mine:** Donald  Kaskan et al → Ridge Deep Mine; 1987-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dlr Mining Inc → Ridge Deep Mine; 1998-04-01 to 2003-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Kaskan et al → Dlr Mining Inc; 1998-04-01 to 2003-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Kaplon et al → Dlr Mining Inc; 1998-04-01 to 2003-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Ridge Deep Mine; 2003-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AMFIRE Mining Company LLC → Ridge Deep Mine; 2003-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → AMFIRE Mining Company LLC; 2003-11-17 to current/open; source msha-controller-operator-history