# Relationship history for MSHA mine 4103428

Current hierarchy: **ITOCHU International Inc; I Power Investment Inc → NAES Corporation → Calvert 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

- **operator_operates_mine:** Phillips Coal Company → Calvert Mine; 1986-07-01 to 1988-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Petroleum Company → Calvert Mine; 1986-07-01 to 1989-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Petroleum Company → Phillips Coal Company; 1986-07-01 to 1988-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Walnut Creek Mining Company → Calvert Mine; 1988-05-10 to 2016-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Peter Sons' Inc → Calvert Mine; 1988-05-10 to 2014-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Peter Sons' Inc → Walnut Creek Mining Company; 1988-05-10 to 2014-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Peter Sons' Inc → Calvert Mine; 2004-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Black Walnut Mining, LLC → Calvert Mine; 2014-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Walnut Mining, LLC → Walnut Creek Mining Company; 2014-10-14 to 2016-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Mining Group → Calvert Mine; 2016-07-22 to 2020-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Peter Sons' Inc → Kiewit Mining Group; 2016-07-22 to 2020-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Walnut Management Company LLC → Calvert Mine; 2020-01-15 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Black Walnut Mining, LLC → Calvert Mine; 2020-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Walnut Mining, LLC → Black Walnut Management Company LLC; 2020-01-15 to 2023-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Panamint Power dba Walnut Creek Mining → Calvert Mine; 2023-09-01 to 2024-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Forethought Life Insurance Company et al → Calvert Mine; 2023-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Forethought Life Insurance Company et al → Panamint Power dba Walnut Creek Mining; 2023-09-01 to 2024-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Panamint Capital LLC et al → Panamint Power dba Walnut Creek Mining; 2023-09-01 to 2024-02-13; source msha-controller-operator-history
- **operator_operates_mine:** NAES Corporation → Calvert Mine; 2024-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** I Power Investment Inc et al → Calvert Mine; 2024-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** I Power Investment Inc et al → NAES Corporation; 2024-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ITOCHU International Inc et al → NAES Corporation; 2024-02-14 to current/open; source msha-controller-operator-history