# Relationship history for MSHA mine 4201968

Current hierarchy: **Atlantic Richfield Company → Beaver Creek Coal Company → Gordon Creek No 8 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Atlantic Richfield Company → Gordon Creek No 8 Mine; 1980-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Creek Coal Company → Gordon Creek No 8 Mine; 1986-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlantic Richfield Company → Beaver Creek Coal Company; 1986-01-01 to current/open; source msha-controller-operator-history