# Relationship history for MSHA mine 4801215

Current hierarchy: **Core Natural Resources Inc → Thunder Basin Coal Company LLC → Coal Creek 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:** Washington Group International Inc → Coal Creek Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Atlantic Richfield Company → Coal Creek Mine; 1975-01-01 to 1998-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Basin Coal Company Llc → Coal Creek Mine; 1979-01-01 to 1994-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Atlantic Richfield Company → Thunder Basin Coal Company Llc; 1979-01-01 to 1994-04-17; source msha-controller-operator-history
- **operator_operates_mine:** S & M Construction Inc → Coal Creek Mine; 1994-04-18 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Zodiac Exploration Company Inc → Coal Creek Mine; 1994-04-18 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Zodiac Exploration Company Inc → S & M Construction Inc; 1994-04-18 to 1996-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Fuller Construction Inc → Coal Creek Mine; 1997-01-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Lonnie  Fuller → Coal Creek Mine; 1997-01-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lonnie  Fuller → Fuller Construction Inc; 1997-01-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Coal Creek Mine; 1998-06-01 to 2006-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Washington Group International Inc → Coal Creek Mine; 1999-09-01 to 2000-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Washington Group International Inc → Washington Group International Inc; 1999-09-01 to 2000-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Basin Coal Company LLC → Coal Creek Mine; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Thunder Basin Coal Company LLC; 2000-11-01 to 2006-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Coal Creek Mine; 2006-02-03 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Thunder Basin Coal Company LLC; 2006-02-03 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Core Natural Resources Inc → Coal Creek Mine; 2025-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Thunder Basin Coal Company LLC; 2025-01-14 to current/open; source msha-controller-operator-history