# Relationship history for MSHA mine 0102128

Current hierarchy: **Confederate Coal Company Inc → Ajax Mining Company Inc → Black Pond 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:** Confederate Coal Company Inc → Black Pond Mine #1; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** North American Coal & Development → Black Pond Mine #1; 1979-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North American Mining Company Inc → Black Pond Mine #1; 1979-10-01 to 1979-11-15; source msha-controller-operator-history
- **controller_controls_operator:** North American Coal & Development → North American Mining Company Inc; 1979-10-01 to 1979-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Ajax Mining Company Inc → Black Pond Mine #1; 1979-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Confederate Coal Company Inc → Ajax Mining Company Inc; 1979-11-16 to current/open; source msha-controller-operator-history