# Relationship history for MSHA mine 1511793

Current hierarchy: **Gary Wayne  Johnson → Black Hills Coal Inc → Black Hills Mine #1**

- 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:** Donald E  Bowles → Black Hills Mine #1; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barmac Coal Inc → Black Hills Mine #1; 1979-03-01 to 1980-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Raymond L  McIntosh → Black Hills Mine #1; 1979-03-01 to 1980-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Raymond L  McIntosh → Barmac Coal Inc; 1979-03-01 to 1980-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Chappell Coal Company Inc → Black Hills Mine #1; 1980-01-03 to 1981-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  Chappell → Black Hills Mine #1; 1980-01-03 to 1981-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Chappell → Chappell Coal Company Inc; 1980-01-03 to 1981-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Charolais Corp → Black Hills Mine #1; 1981-08-01 to 1997-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Donald E  Bowles → Charolais Corp; 1981-08-01 to 1997-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Centennial Resources Inc → Black Hills Mine #1; 1997-03-07 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Centennial Coal Inc → Black Hills Mine #1; 1997-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Centennial Coal Inc → Centennial Resources Inc; 1997-03-07 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Gary Wayne  Johnson → Black Hills Mine #1; 1999-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Hills Coal Inc → Black Hills Mine #1; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary Wayne  Johnson → Black Hills Coal Inc; 2000-07-01 to current/open; source msha-controller-operator-history