# Relationship history for MSHA mine 1512474

Current hierarchy: **Alpha Natural Resources, Inc. → Peter Cave Mining Co. → No 11 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:** Peter Cave Mining Co. → No 11 Mine; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 11 Mine; 1980-08-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Peter Cave Mining Co.; 1980-08-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 11 Mine; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Peter Cave Mining Co.; 2011-06-01 to current/open; source msha-controller-operator-history