# Relationship history for MSHA mine 1512669

Current hierarchy: **George E  Barker → Crockett Collieries (Ky) Inc → No 8 Mountain Top Removal 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:** Bow Valley Coal (Ky) Inc → No 8 Mountain Top Removal Mine; 1980-12-01 to 1984-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Bow Valley Industries Ltd → No 8 Mountain Top Removal Mine; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Bow Valley Coal (Ky) Inc; 1980-12-01 to 1984-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Mountain Contractors Inc → No 8 Mountain Top Removal Mine; 1984-02-07 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Bill J  Collett et al → No 8 Mountain Top Removal Mine; 1984-02-07 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Bill J  Collett et al → Eastern Mountain Contractors Inc; 1984-02-07 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → No 8 Mountain Top Removal Mine; 1987-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crockett Collieries (Ky) Inc → No 8 Mountain Top Removal Mine; 1992-10-26 to 1995-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Crockett Collieries (Ky) Inc; 1992-10-26 to 1995-11-01; source msha-controller-operator-history
- **controller_controls_mine:** George E  Barker → No 8 Mountain Top Removal Mine; 1995-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crockett Collieries (Ky) Inc → No 8 Mountain Top Removal Mine; 1995-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George E  Barker → Crockett Collieries (Ky) Inc; 1995-11-02 to current/open; source msha-controller-operator-history