# Relationship history for MSHA mine 1510524

Current hierarchy: **James W  Croley → Croley Coal Corp → Mason No 12 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:** Goldfield Corp → Mason No 12 Mine; 1975-03-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → Mason No 12 Mine; 1977-06-01 to 1981-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Goldfield Corp → Harlan Fuel Company; 1977-06-01 to 1981-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Croley Coal Corp → Mason No 12 Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James W  Croley → Mason No 12 Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Croley → Croley Coal Corp; 1981-06-01 to current/open; source msha-controller-operator-history